JP2006094257A - Video signal processing apparatus and method, and video signal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video signal processing apparatus and method and video signal display device in which image quality deterioration caused by a combing phenomenon can be prevented when converting a jump scan video signal into a progressive scan video signal. <P>SOLUTION: There are included: a correlation detecting means 120 for generating a signal cnt indicating a strength of frame correlation of a video signal; a sequence detecting means 14 for generating a telecine sequence detecting signal tci<SB>0</SB>indicating whether or not the video signal fulfills telecine sequence repetition conditions; an appearance frequency detecting means 15 for generating a flag tciflg relating to an appearance frequency of a telecine sequence; a predictive control means 16 for outputting a telecine detecting signal tci on the basis of the telecine sequence detecting signal tci<SB>0</SB>and the predictive control flag tciflg; an interpolation signal generating means 110 for selecting any one of a plurality of kinds of interpolation signals Im, It based on the telecine detecting signal tci; and a double-speed conversion means 9 for generating a progressive scan video signal Prog from a delayed video signal R and an interpolation signal I. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a video signal processing device, a video signal processing method, and a video signal display device to which this video signal processing device or method is applied, and more particularly to an interlaced video signal that is converted into a progressive scanning (progressive) video signal. The present invention relates to prevention of image quality deterioration that may occur when an interlaced video signal telecine-converted by a 2-3 pulldown method from a signal such as a movie film is converted into a progressive video signal.

  While movie films and the like are shot at 24 frames per second, standard television signals such as NTSC signals and high-definition signals become video signals of 60 fields per second by interlaced scanning (interlace). Yes. Therefore, when a film film signal is broadcast as a television broadcast program or a video package, a signal of 24 frames per second is converted into an interlaced video signal for television broadcast of 60 fields per second ("telecine"). It is called “conversion”. In telecine conversion, in general, the first frame (odd-numbered frames) is converted into 2-3 fields and the second frame (even-numbered frames) is converted into 2-3 fields, and once every 5 fields, Repeat the same field as 2 fields before. By 2-3 pulldown conversion, a video signal of 24 frames per second can be converted into an interlaced video signal of 60 fields per second (a video signal that has been telecine-converted and is referred to as a “telecine video signal”). In telecine conversion, there are cases where 3-2 pulldown conversion is performed so that the first frame corresponds to 3 fields and the second frame corresponds to 2 fields, but 3-2 pulldown conversion is substantially equivalent to 2-3 pulldown conversion. Is the same process. For this reason, when describing as “2-3 pulldown conversion” in the present application, it includes not only the case of the telecine conversion by the 2-3 pulldown method but also the case of the telecine conversion by the 3-2 pulldown method.

  On the other hand, in recent years, when an interlaced television signal is displayed with high image quality, a process of converting the interlaced video signal into a progressive video signal (referred to as “IP conversion”) is performed. In IP conversion, in general, when a video is a still image, interpolation (inter-field interpolation) is performed by fitting pixels of corresponding scanning lines in temporally adjacent fields, and the video is a moving image. Is subjected to motion adaptive IP conversion in which an interpolation signal is generated by pixels in adjacent scanning lines in the same field (intra-field interpolation). Further, when performing IP conversion, it is detected whether the video signal to be processed is a telecine video signal and the 2-3 pulldown phase (the direction of the field converted from the same frame) (referred to as “telecine detection”). For the telecine video signal, the progressive video signal before being telecine converted by the 2-3 pulldown method using the top field and the bottom field converted from the same frame is restored according to the 2-3 pulldown phase. And converted into a progressive video signal for television. Hereinafter, IP conversion for a telecine video signal is referred to as “telecine interpolation”.

  In a conventional video signal processing apparatus for IP-converting a telecine video signal based on the 2-3 pull-down method, the same field as the previous two fields is repeatedly converted once every five fields. For this reason, the difference from the field one frame before (that is, two fields before) becomes zero or less than a predetermined threshold at a period of once every five fields. Devices that perform telecine detection using this characteristic and perform telecine interpolation have been proposed (see, for example, Patent Documents 1, 2, and 3).

  In addition, in order to prevent erroneous detection in telecine detection and to stably perform IP conversion of a telecine video signal, the number of screen matches in a telecine video signal sequence repeated in five fields is counted, and input based on this count value There is also a proposal of an apparatus for determining whether or not a video signal is a telecine video signal (see, for example, Patent Document 4).

  Furthermore, there is a proposal of an apparatus that detects a repetition sequence for every five fields of interframe differences in a telecine video signal and detects a predetermined pattern deviation that is not a telecine video signal from difference information in the five fields (for example, (See Patent Document 5).

  Furthermore, the patterns up to 5 fields before each field are sequentially judged, and a signal indicating the scene change point is obtained by detection from the outside or an input signal, and the predetermined pattern is deviated in consideration of the signal indicating the scene change point. There is also a proposal of a device that accurately detects a telecine video signal (see, for example, Patent Document 6).

Japanese Patent No. 3398396 (FIGS. 1 and 2) JP 2002-330408 A (FIGS. 1 and 2) JP 2002-335441 A (FIG. 1) JP 2002-204433 A (FIG. 1) JP 2003-78926 A (FIGS. 1 and 2) JP2003-17984A (FIG. 1)

  However, in the above-described conventional apparatus, editing points frequently exist in the middle of a telecine video signal due to editing for TV broadcasting, insertion of CM (commercial) or telop, or in the middle of a telecine video signal. When signals other than telecine video signals are mixed, field sequence (phase) shifts or omissions of video signals telecine-converted using the 2-3 pull-down method occur in telecine detection, and sequence discontinuity is detected. There are things that cannot be done. For this reason, in the above-described conventional apparatus, the IP conversion is performed using the interpolation signal in the field in the wrong direction, the image quality is deteriorated due to the combing phenomenon in which the output image is broken in a comb shape, and good IP conversion cannot be performed. There is a problem.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and its purpose is to perform processing for sequentially converting interlaced scanning video signals converted by the 2-3 pull-down method into scanning video signals. An object of the present invention is to provide a video signal processing device, a video signal processing method, and a video signal display device capable of preventing image quality deterioration due to combing phenomenon.

  The video signal processing apparatus according to the present invention is a video signal processing apparatus for converting an interlaced scanning video signal into a progressive scanning video signal, a field delay means for delaying the interlaced scanning video signal in units of fields, and the interlaced scanning video signal. A correlation detecting means for detecting a correlation between the field of interest and a field one frame before the field of interest and outputting a signal indicating the strength of the correlation between frames based on the detection result; Based on the signal indicating the strength of the correlation, it is determined whether the interlaced scanning video signal satisfies the condition of the field sequence of the video signal subjected to telecine conversion, and a telecine sequence detection signal is generated based on the determination result. Based on the output sequence detection means and the signal indicating the strength of the correlation between the frames, the telecine change is performed. An appearance frequency detecting means for measuring an appearance frequency of a field sequence that satisfies a field sequence condition of the received video signal and outputting a prediction control signal based on the measurement result; and a telecine based on the telecine sequence detection signal and the prediction control signal. A prediction control means for outputting a detection signal; and a plurality of types of interpolation signals based on the interlaced scanning video signal and the video signal delayed by the field delay means; and the plurality of types of interpolation signals based on the telecine detection signal. Interpolation signal generating means for selecting and outputting one of the above, and conversion means for generating the sequential scanning video signal based on the interlaced scanning video signal and the interpolation signal output from the interpolation signal generating means I have it.

  The video signal processing method of the present invention is a video signal processing method for converting an interlaced video signal into a progressive video signal, the step of delaying the interlaced video signal in units of fields, and the interlaced video signal Detecting a correlation between the field of interest and a field one frame before the field of interest, and outputting a signal indicating the strength of the correlation between the frames, and a signal indicating the strength of the correlation between the frames And determining whether or not the interlaced scanning video signal satisfies the condition of the field sequence of the telecine-converted video signal, generating and outputting a telecine sequence detection signal based on the determination result, and the frame A field sequence of the telecine-converted video signal based on a signal indicating the strength of the correlation between Measuring the appearance frequency of a field sequence that satisfies a condition, outputting a prediction control signal based on the measurement result, outputting the telecine sequence detection signal and the telecine detection signal based on the prediction control signal, and the telecine detection Selecting and outputting one of a plurality of types of interpolated scanning line signals generated based on the interlaced scanning video signal and the delayed interlaced scanning video signal based on a signal; and the interlaced scanning video signal and Generating the progressive scanning video signal based on the selected interpolated scanning line signal.

  Furthermore, the video signal display device of the present invention displays the video signal processing device, display means for displaying video, and video based on the progressive scanning video signal output from the video signal processing device on the display means. Display processing circuit.

  According to the video signal processing apparatus or the video signal processing method of the present invention, it is detected whether or not the interlaced scanning video signal that is sequentially input satisfies the condition of the field sequence of the video signal subjected to telecine conversion, and the telecine conversion is performed. The appearance frequency of the field sequence that satisfies the condition of the field sequence of the video signal is measured, and a telecine detection signal indicating whether or not the video signal has been subjected to telecine conversion is output based on these results. Thus, in addition to the detection result of whether or not the video signal satisfies the condition of the field sequence of the video signal subjected to telecine conversion, the field has a meaning as an index indicating the certainty that the video signal is a telecine converted video signal. Since the telecine detection signal based on the appearance frequency of the sequence is output, the reliability of the telecine detection signal is improved. Therefore, according to the present invention, it is possible to appropriately select an interpolation signal selected based on the telecine detection signal by improving the reliability of the telecine detection signal, so that telecine conversion is performed in the middle of the telecine-converted video signal. It is possible to reduce the frequency of image quality degradation due to the combing phenomenon that may occur when signals other than the video signals that have been mixed are mixed, and to convert the telecine-converted video signal into a good progressive scan video signal An effect can be obtained.

  In addition, according to the video signal display device of the present invention, it is possible to obtain an effect that it is possible to display a high-quality video based on a good progressive video signal with reduced image quality degradation due to the combing phenomenon.

  The video signal processing device, the video signal processing method, and the video signal display device according to the embodiment of the present invention obtain the correlation between one frame from the difference information from the previous frame, and the input video signal is telecine. It is detected whether or not the video signal satisfies a repetition condition of a five-field field sequence (referred to as “telecine sequence”) in the video signal, and the appearance frequency of the telecine sequence in the input video signal is detected (appearance of the telecine sequence). If the frequency is high, there is a high possibility that the video signal is a telecine video signal, so the appearance frequency of the telecine sequence has a meaning as an index indicating the probability of being a telecine video signal.) Based on these detection results The result of telecine detection is predicted and IP conversion is controlled. In the present application, the configuration indicated as “... Means” may be realized by an electric circuit (hardware) or realized by software.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a video signal processing apparatus according to Embodiment 1 of the present invention (that is, an apparatus capable of implementing the video signal processing method according to Embodiment 1).

  As shown in FIG. 1, the video signal processing apparatus according to the first embodiment includes an input terminal 100 to which an interlace video signal (also referred to as “input video signal” or “current field signal”) Ia is sequentially input, and timing. The signal generating means 1, the 1-field delay means 2 for delaying the interlaced video signal Ia by 1 field, the 1-field delay means 3 for delaying the 1-field delay signal Ib output from the 1-field delay means 2 by 1 field, and sequentially input It is detected whether the interlaced video signal Ia is a video signal that satisfies the repetition condition of the five-field field sequence (that is, telecine sequence) in the telecine video signal, and the phase of interpolation in 2-3 pulldown is detected. Telecine detection means 6. The timing signal generator 1 separates the vertical and horizontal synchronization signals from the interlaced video signal Ia input from the input terminal 100, and generates a timing signal based on the separated synchronization signals. Here, the timing signal generating means 1 generates, for example, an area signal te for indicating a predetermined area in one field as the timing signal. The video signal processing apparatus according to the first embodiment generates an interpolation signal (also referred to as an “interpolation scanning line signal”), and generates an interpolation signal that selects the interpolation signal based on the telecine detection signal tci from the telecine detection means 6. 110 and a double speed converting means 9 for fitting the interpolation signal I output from the interpolation signal generating means 110 between the corresponding scanning lines of the actual scanning line signal R, performing double speed conversion, converting to a progressive video signal Prog, and outputting it. And an output terminal 101 for outputting a progressive video signal Prog.

  As shown in FIG. 1, the interpolation signal generation unit 110 includes a motion detection unit 4, a motion adaptive interpolation processing unit 5, a telecine interpolation processing unit 7, and a selection unit 8. The motion detection means 4 receives the current field signal Ia and the two-field delay signal Ic output from the one-field delay means 3, detects the motion based on the inter-frame difference of the video signal, and detects the motion as a result of this detection. The signal detm is output. The motion adaptive interpolation processing means 5 includes a 1-field delay signal Ib output from the 1-field delay means 2, a 2-field delay signal Ic output from the 1-field delay means 3, and a motion detection output from the motion detection means 4. The signal detm is received, and scanning line interpolation processing according to the motion detection signal detm is performed. The telecine interpolation processing means 7 receives the current field Ia, the two-field delay signal Ic output from the one-field delay means 3, and the interpolation phase flag tcf from the telecine detection means 6, and based on the interpolation phase flag tcf, 2− A scanning line interpolation process corresponding to a 3 pull-down signal is performed. The selection unit 8 receives the interpolation signal Im generated by the motion adaptive interpolation processing unit 5, the interpolation signal It generated by the telecine interpolation processing unit 7, and the telecine detection signal tci from the telecine detection unit 6, and detects telecine detection. Depending on the signal tci, either the interpolation signal Im from the motion adaptive interpolation processing means 5 or the interpolation signal It from the telecine interpolation processing means 7 is selected and output as the interpolation signal I.

  Further, as shown in FIG. 1, the telecine detection means 6 includes a correlation detection means 120 for detecting a correlation between one frame from the difference information from the previous field, a sequence detection means 14, and an input video. Appearance frequency detection means 15 for monitoring the signal and prediction control means 16 are provided. The correlation detection unit 120 includes a difference detection unit 11 that detects a difference between one frame, a comparison unit 12 that compares an output signal from the difference detection unit 11 with a predetermined threshold, and a predetermined area accumulation counter 13.

  The telecine detection means 6 receives the current field signal Ia and the two-field delay signal Ic from the one-field delay means 3. The telecine detection means 6 detects whether or not the input video signal is a video signal satisfying the repetition condition of the telecine sequence of 5 fields in the telecine video signal in 2-3 pulldown from the difference information between one frame, A telecine detection signal tci that detects the frequency of appearance of a telecine sequence in the input video signal (ie, determines “probability of being a telecine video signal”) and indicates the detection of the telecine video signal based on these detection results; An interpolation phase flag tcf indicating a 2-3 pull-down phase (that is, the direction of a field converted from the same frame) is generated and output. When the telecine detection means 6 detects that the input video signal Ia is a telecine video signal, for example, the value of the telecine detection signal tci is set to '1' (that is, tci = 1), and the input video signal Ia is telecine. When it is detected that it is not a video signal, for example, the value of the telecine detection signal tci is set to “0” (that is, tci = 0). For example, when the previous field is the same field, the telecine detection unit 6 sets the value of the interpolation phase flag tcf to “1” (that is, tcf = 1) and the subsequent field is the same field. For example, the value of the interpolation phase flag tcf is set to “0” (that is, tcf = 0). The interpolation phase flag tcf is sent to the telecine interpolation processing means 7 in the interpolation signal generation means 110, and the telecine detection signal tci is sent as a control signal to the selection means 8 in the interpolation signal generation means 110. Details of the telecine detection means 6 will be described later.

  As shown in FIG. 1, the interpolation signal generation means 110 receives the current field signal Ia, the 1-field delay signal Ib from the 1-field delay means 2, and the 2-field delay signal Ic from the 1-field delay means 3. The interpolation signal I is output.

  The motion detection means 4 in the interpolation signal generation means 110 receives the current field signal Ia and the 2-field delay signal Ic from the 1-field delay means 3, and obtains difference information between the signals in the two fields. Then, based on the obtained difference information, the motion detection unit 4 detects the motion of the video signal during one frame and sends a motion detection signal detm indicating the motion of the video signal to the motion adaptive interpolation processing unit 5.

  The motion adaptive interpolation processing means 5 in the interpolation signal generating means 110 receives the 1 field delay signal Ib from the 1 field delay means 2 and the 2 field delay signal Ic from the 1 field delay means 3 from the motion detection means 4. Based on the output motion detection signal detm, motion adaptive IP conversion is performed. The interpolation scanning line signal generation process is performed on the one-field delay signal Ib. Based on the motion detection signal detm, the motion adaptive interpolation processing means 5 performs inter-field interpolation by inserting pixels corresponding to the scanning line from the temporally previous two-field delay signal Ic, or vertical in the one-field delay signal Ib. Intra-field interpolation processing is performed from pixel signals positioned above and below the direction, and an interpolation scanning line signal (interpolation signal) Im is output.

  The telecine interpolation processing means 7 in the interpolation signal generating means 110 receives the current field signal Ia and the two-field delay signal Ic from the one-field delay means 3, and based on the interpolation phase flag tcf from the telecine detection means 6, 2 The field corresponding to the −3 pull-down conversion phase is selected from the current field signal Ia or the two-field delay signal Ic, and output as an interpolated signal (referred to as “telecine interpolated signal”) It in the case of a telecine video signal.

  The selection means 8 in the interpolation signal generation means 110 is a telecine output from the telecine detection means 6, either the interpolation signal Im from the motion adaptive interpolation processing means 5 or the telecine interpolation signal It from the telecine interpolation processing means 7. The signal is selected according to the detection signal tci and sent to the double speed conversion means 9 as an interpolation signal I. The telecine detection signal tci is a signal indicating a detection result by the telecine detection means 6 as to whether or not the input video signal Ia is a telecine video signal. The selection means 8 selects the telecine interpolation signal It from the telecine interpolation processing means 7 when the telecine detection signal tci indicates a telecine video signal (in the case of tci = 1 in the first embodiment). When the telecine detection signal tci indicates that it is not a telecine video signal (in the case of tci = 0 in the first embodiment), it is assumed that the telecine detection signal tci is a normal video signal. The signal Im is selected and output.

  The double speed conversion means 9 is a field to be interpolated, and is a 1-field delay signal R (ie, Ib) from the 1-field delay means 2 that is an actual scanning line signal, and an interpolation signal I (ie, an interpolation signal) from the selection means 8. Im or It) is input, the interpolation signal is fitted between the corresponding scanning lines of the actual scanning line signal, double-speed converted, converted to a progressive video signal Prog, and output. From the output terminal 101, a progressive video signal Prog which is the output of the double speed conversion means 9 is output.

  The correlation detection means 120 in the telecine detection means 6 includes a current field signal Ia from the input terminal 100, a two-field delay signal Ic from the one-field delay means 3, and a predetermined area in one field from the timing signal generation means 1. The correlation between one frame is detected based on the area signal te indicating, and a moving pixel cumulative value cnt in units of one field period is output as a value indicating the strength of the correlation between one frame.

  The difference detection means 11 in the correlation detection means 120 receives the current field signal Ia from the input terminal 100 and the 2-field delay signal Ic from the 1-field delay means 3. The difference detection means 11 obtains the difference between each pixel of the current field signal Ia and the two-field delay signal Ic, takes the absolute value of the difference, and outputs one-frame difference information.

  The inter-frame difference information from the difference detection unit 11 is input to the comparison unit 12 in the correlation detection unit 120. The comparison unit 12 compares the inputted inter-frame difference information from the difference detection unit 11 with a predetermined threshold value, and outputs a comparison result. In the comparison, for example, if the inter-frame difference information is smaller than a predetermined threshold value, the pixel is determined as a still pixel, and if the difference information is equal to or higher than the predetermined threshold value, the pixel is determined as a moving pixel. Is output. The binarized value is, for example, “0” when it is determined as a still pixel and “1” when it is determined as a moving pixel. Note that the binarized value is not limited to the above, and may be any other value as long as it indicates the result of each pixel determined as a still pixel or a moving pixel by comparison.

  A predetermined area accumulation counter 13 in the correlation detection unit 120 includes a value binarized as a still pixel or a moving pixel by the comparison unit 12 and an area signal indicating a predetermined area in one field from the timing signal generation unit 1. te is input. In the area indicated by the area signal te indicating the predetermined area in one field from the timing signal generating unit 1 according to the value binarized as a still pixel or a moving pixel, the predetermined area accumulation counter 13 Accumulate the number of pixels of the value that becomes a moving picture element. That is, the case where the value determined as a moving pixel from the comparison unit 12 is “1” is accumulated over the area of the area signal te, and the accumulated moving pixel value cnt in the area is set to the number of moving pixels in one field. A corresponding value (number of moving pixels or accumulated moving pixels) is output for each field unit. The accumulated moving pixel value cnt, which is the accumulated result, is a value indicating the strength of correlation between one frame. When the correlation is strong (that is, in the case of a still image), the number of moving pixels in one field is small. Therefore, when the correlation is weak (that is, in the case of a moving image with a large motion), the number of moving pixels in one field increases.

  Depending on the video signal, it may be sent as a movie material in which a black signal portion (no image portion) exists in the upper and lower band portions called letter boxes, and the area signal te is, for example, the upper and lower band portions in one field. The timing signal generating means 1 generates a signal indicating the pixel period excluding the image blanking period. Therefore, in the predetermined area accumulation counter 13, the number of moving pixels in the area excluding the upper and lower band portions and the image blanking period is output as the number of moving pixels in one field, thereby preventing erroneous determination.

  The sequence detection means 14 in the telecine detection means 6 receives the moving pixel accumulated value cnt in units of one field period output from the predetermined area accumulation counter 13. The sequence detection means 14 determines whether the field is a still image field, whether the input video signal is a video signal satisfying the repetition condition of the telecine sequence of 5 fields, from the input moving pixel accumulated value cnt, and 2-3 Pull down sequence phase is detected.

  FIG. 2 is a block diagram showing the configuration of the sequence detection means 14 in the telecine detection means 6 in the video signal processing apparatus according to the first embodiment. As shown in FIG. 2, the sequence detection unit 14 of the first embodiment has the first, second, and third still image detection units 21 a, 21 b, and 21 c, the moving picture field counter 22, and the phase of the telecine sequence. The sequence phase detecting means 141 for detecting, the telecine sequence repetition condition is detected, the telecine sequence determining means 142 for determining whether or not the video signal satisfies the telecine sequence repetition condition, and the telecine sequence repetition condition is satisfied. And telecine cancellation detecting means 143 for detecting the absence.

  As shown in FIG. 2, the sequence phase detection unit 141 includes a telecine sequence phase counter 23 and an interpolation phase flag generation unit 35. The telecine sequence determination unit 142 includes a telecine activation counter 24, a sequence detection signal generation unit 36, and an activation count value setting unit 37. Further, the telecine release detecting means 143 includes a moving image continuous detecting means 25, a still image continuous detecting means 27, a comparing means 28, a sequence deviation detecting means 29 comprising an in-sequence still image counter 30 and a comparing means 31, and a scene change. It has detection means 32, comparison threshold setting means 33, and release signal generation means 34.

  Here, the telecine video signal is converted once by every five fields, and the same field as the previous two fields is repeatedly converted, and the video output from the predetermined area cumulative counter 13 based on the difference from the previous field. In the case of a telecine video signal, the elementary accumulated value cnt has a field (still image) that is zero or less than or equal to a predetermined threshold in one cycle in five fields.

  FIG. 3 shows the moving pixel accumulated value cnt (vertical axis) and field number (time, that is, horizontal axis) output from the predetermined area cumulative counter 13 in the correlation detecting means 120 in the video signal processing apparatus according to the first embodiment. It is a figure which shows the relationship (in the case of a telecine video signal). FIG. 3 shows a case where a field image from a telecine video signal is processed by the difference detection means 11, the comparison means 12, and the predetermined area accumulation counter 13 in the image simulation. As shown in FIG. 3 as field numbers 1, 6, 11,..., 41, the moving pixel accumulated value cnt of the telecine video signal is a still image field that becomes zero or less than a predetermined threshold value in one cycle in five fields. It is a repeating sequence.

Therefore, the detection of the condition of being a telecine sequence can be performed by detecting a five-field repeated sequence in which a still picture field becomes one field after four consecutive moving picture fields. The sequence detection means 14 detects whether or not the field is a still picture field from the moving pixel accumulated value cnt, and detects the still picture field once in these five fields, so that the input video signal is a telecine sequence. The detection signal tci ₀ indicating the result (that is, the telecine sequence detection result) and the interpolation phase flag tcf indicating the phase at the time of telecine interpolation are output.

Further, the appearance frequency detection unit 15 detects the appearance frequency of the telecine sequence using the same sequence detection condition as the sequence detection unit 14. The sequence detection unit 14 outputs the still image detection result stl _{1 of the} field detected by the sequence detection unit 14, the moving image continuous number mvf, and the telecine sequence phase seq to the appearance frequency detection unit 15.

  The telecine detection in the telecine detection means 6 is performed on a field basis, and the operation of each block in the sequence detection means 14, the appearance frequency detection means 15, and the prediction control means 16 for detecting the telecine sequence is processed for each field. It operates at the timing of the field pulse based on the vertical synchronization signal.

  The moving pixel cumulative value cnt in units of one field inputted from the predetermined area accumulation counter 13 to the sequence detection means 14 is the first, second and third still image detection means 21a, 21b, 21c and the telecine release detection means. 143 is sent to the scene change detection means 32.

  Each of the first, second, and third still image detecting means 21a, 21b, and 21c compares the moving pixel cumulative value cnt of one field unit from the predetermined area cumulative counter 13 with a predetermined threshold value, and the field is It is detected whether it is a still picture field. When the input moving pixel accumulated value cnt is smaller than a predetermined threshold (that is, when the number of moving pixels in one field is smaller than a predetermined number), the still image field is detected with the field as a still image. When the accumulated moving pixel value cnt is larger than a predetermined threshold value (that is, when more moving pixels than the predetermined threshold value are included in one field), that field is set as a moving image field, and in other cases, it is stationary. It can also be detected as a picture.

The first still image detection unit 21a compares the video element cumulative value cnt with a predetermined threshold STL_TH _1, when moving element cumulative value cnt entered the predetermined threshold STL_TH ₁ less than the field as a still image The value of the detection result stl ₁ is “1” (stl ₁ = 1, indicating a still image). Otherwise, the value of the detection result stl ₁ is “0” (stl ₁ = 0. , Showing a video.) Here, the predetermined threshold value STL_TH ₁ for still image detection is set to a value that allows detection of a still image field by the same field once in five fields in the telecine sequence.

Similarly, the second still image detection unit 21b compares the video element cumulative value cnt to a predetermined threshold value STL_TH _2, when moving element cumulative value cnt entered a predetermined threshold STL_TH ₂ less than the field As a still image, the value of the detection result stl ₂ is “1” (stl ₂ = 1, indicating a still image). Otherwise, the value of the detection result stl ₂ is “0” (stl ₂ = 0, indicating a moving image). The predetermined threshold value STL_TH ₂ for detecting a still image is a value for detecting a continuous still image, and can be detected only when a still image such as caption is inserted or a completely still image is detected. It can be set to such a value. It is also possible to set the same value as the predetermined threshold in the first still image detection means 21a.

The third still image detection unit 21c compares the video element cumulative value cnt with a predetermined threshold STL_TH _3, when moving element cumulative value cnt entered a predetermined threshold STL_TH ₃ less than the field still As a picture, the value of the detection result stl ₃ is set to “1” (stl ₃ = 1, indicating a still picture). In other cases, the value of the detection result stl ₃ is set to “0” (stl ₃ = 0). And shows a video.) The predetermined threshold value STL_TH ₃ for still image detection is set to a value that can detect a still image field in a field different from a still image once in five fields of the telecine sequence. The predetermined threshold value can be set to the same value as the predetermined threshold value in the first still image detection means 21a.

The detection result stl ₁ from the first still image detection means 21a is a moving picture field counter 22, a sequence phase detection means 141, a telecine sequence determination means 142, and a telecine release detection means in order to detect a telecine sequence of 5 fields. It is sent to the moving image continuous detection means 25 in 143 and output to the appearance frequency detection means 15. The detection result stl ₂ from the second still image detection means 21b is sent to the still picture continuous detection means 27 in the telecine release detection means 143, and the detection result stl ₃ from the third still picture detection means 21c is taken to the telecine. This is output to the sequence deviation detection means 29 in the release detection means 143.

Video The field counter 22, the still image detection result stl ₁ field from the first still image detection unit 21a is inputted. The moving picture field counter 22 counts the continuation of the moving picture field based on the input detection result st1 ₁ and outputs the moving picture field continuation number mvf up to the previous field. That is, when the input detection result stl ₁ is “1” indicating a still image (that is, when stl ₁ = 1), the moving image field counter 22 resets the counter and is “0” indicating a moving image. If (i.e., if the stl 1 = ₀₎ is counted, timed to the next field, and outputs the consecutive number mvf the counted video field.

The sequence phase detection unit 141 repeats in units of 5 fields based on the field still image detection result stl ₁ from the first still image detection unit 21a and the moving image continuous number mvf from the moving image field counter 22 to the previous field. The phase of the telecine sequence is detected, and the count value seq indicating the sequence phase of 5 fields and the interpolation phase flag tcf are output.

The telecine sequence phase counter 23 in the sequence phase detecting unit 141 includes a field still image detection result stl ₁ from the first still image detecting unit 21a, and a moving image continuous number mvf from the moving image field counter 22 to the previous field. Is entered. The telecine sequence phase counter 23 repeatedly counts from “0” to “4”, which is a 5-field period for each field, and repeats based on the still image detection result stl ₁ and the continuous number mvf of moving image fields up to the previous field. Reset the period counter. That is, the telecine sequence phase counter 23, the still image detection result is stl ₁ is '1' (still image), and, when pre-video consecutive number mvf up field is '4', 5 in the telecine video signal It is determined that the field is a complete still image field, and the count value is reset to zero. Thereafter, the telecine sequence phase counter 23 keeps until the still image detection result stl ₁ is 1 and the moving image continuous number mvf becomes “4” (that is, the count value seq is from “1” to “4”). Count for each field.

  The count value seq of the telecine sequence phase counter 23 is repeated in units of 5 fields, and in the telecine video signal, it is reset in synchronization with one complete still image field every 5 fields. It shows the phase of the sequence in 2-3 pulldown. The count value seq, which is the phase of the telecine sequence, is sent to the interpolation phase flag generation means 35. The count value seq is also output to the sequence deviation detection means 29 and the appearance frequency detection means 15 in the telecine cancellation detection means 143.

  The interpolation phase flag generation means 35 in the sequence phase detection means 141 receives the telecine sequence phase count value seq from the telecine sequence phase counter 23, and receives an interpolation phase flag tcf indicating the direction of the field converted from the same frame in the telecine interpolation. Generate. The telecine sequence phase count value seq from the telecine sequence phase counter 23 is a signal repeated in units of 5 fields, and is synchronized with the 2-3 pulldown phase. Therefore, the telecine sequence phase count value seq indicates the field direction at the time of interpolation. For example, in the field phase where telecine interpolation is performed from the previous field in time, the interpolation phase flag tcf is set to “1” and temporally. The interpolation phase flag tcf is set to “0” in the field where telecine interpolation is performed from the subsequent field. Note that the value of the interpolation phase flag tcf is not limited to that described above, and any other value can be used as long as it can distinguish between telecine interpolation from the previous field and telecine interpolation from the subsequent field. Good. The interpolation phase flag tcf from the interpolation phase flag generation means 35 is sent to the telecine interpolation processing means 7 in the interpolation signal generation means 110.

Next, the telecine release detection means 143 includes the still picture detection results stl ₁ , stl ₂ , and stl ₃ from the first, second and third still picture detection means 21a, 21b and 21c, and the moving picture field counter 22. When the moving image continuous number mvf and the moving pixel cumulative value cnt of one field unit from the predetermined area cumulative counter 13 are input, and the input video signal does not satisfy the conditions of the telecine sequence based on each input signal When the telecine sequence condition is not satisfied, a cancel signal rst for canceling the sequence detection signal (that is, assuming that the input video signal is not a telesi sequence) is generated and output. Hereinafter, each block in the telecine cancellation detection means 143 will be described.

The continuous video detection unit 25 in the telecine release detection unit 143 receives the still image detection result stl ₁ from the first still image detection unit 21 a and the continuous video number mvf from the video field counter 22. The moving image continuous detection means 25 detects the case where the number of moving image fields mvf is “4” and the still image detection result stl ₁ is “0” (moving image), and outputs the detection result. In the telecine video signal, since there is the same field once in 5 fields, the continuation of the moving image field does not exceed 5 fields. Therefore, if the detection field is a moving image (ie, stl ₁ = 0) based on the still image detection result stl ₁ , and the moving image continuous number mvf up to the previous field is '4' (ie, mvf = 4), a 5-field moving image is obtained. It will be continuous. For this reason, when mvf is '4' and stl ₁ is '0' (moving image), for example, a detection result of '1' is output as a signal indicating telecine cancellation, and the cancellation is performed. The signal is sent to the signal generator 34.

The still image continuous detection means 27 in the telecine release detection means 143 receives the field still image detection result stl ₂ from the second still image detection means 21b. The still image continuation detecting means 27 counts the continuation of the still image field based on the still image detection result stl ₂ . That is, the still image continuous detection means 27 resets the count value to zero when stl ₂ indicating that the still image detection result indicates a moving image is “0” (moving image), and stl ₂ is “1” (still image). Count when there is. The count value of the still image continuous detection means 27 is output to the comparison means 28 in the telecine release detection means 143.

  The comparison unit 28 in the telecine release detection unit 143 receives the still image continuous count value output from the still image continuous detection unit 27, compares the still image continuous count value with a predetermined threshold value, and the number of continuous images is a predetermined threshold value. The case where it becomes more than is detected. When the number of consecutive still images is equal to or greater than a predetermined threshold, the comparison unit 28 sends a detection result that is, for example, “1” to the cancellation signal generation unit 34 as a signal indicating the telecine cancellation. The predetermined threshold value for comparison takes into account a five-field repetitive sequence of the telecine video signal. For example, the predetermined threshold value is 5 fields. Is output.

  The sequence shift detection means 29 in the telecine release detection means 143 detects that a still picture exists in a field in the middle of a sequence different from the still picture field once in five fields during the detection of the telecine sequence. Detects phase shift in the sequence. The sequence deviation detecting unit 29 includes an in-sequence still image counter 30 and a comparing unit 31.

The in-sequence still image counter 30 includes a still image detection result stl ₃ from the third still image detection unit 21 c, a sequence phase count value seq from the telecine sequence phase counter 23, and a telecine from the sequence detection signal generation unit 36. The sequence detection signal tci ₀ is input. When the telecine sequence detection signal tci ₀ from the sequence detection signal generation unit 36 indicates that it is a telecine sequence, the in-sequence still image counter 30 displays the still image detection result stl ₃ from the third still image detection unit 21c. Count fields that are '1' (still images). However, the still image field is counted every cycle of the sequence phase count value seq synchronized with the 2-3 pull-down phase, and the count value is reset to zero at the position of the still image field once every five fields. Therefore, the still image counter 30 in the sequence detects the case where the still image field is different from the position of the still image field once in 5 fields in the telecine video signal, and outputs the number of the fields. Will be. The count value in the in-sequence still image counter 30 is output to the comparison unit 31 in the sequence deviation detection unit 29.

  The comparison unit 31 in the sequence deviation detection unit 29 compares the count value from the in-sequence still image counter 30 with a predetermined threshold value, and when this count value is equal to or greater than the predetermined threshold value, The detection result dbe is output as a signal indicating telecine cancellation (for example, “1”). In the case of a telecine video signal, a complete still image field is generated once every 5 fields. Therefore, if it is detected that a still image field exists in a field different from the complete still image field in the middle of the sequence, the sequence is changed. Therefore, it can be determined that the regularity is disturbed and there is a 2-3 pull-down phase shift. Therefore, the comparison unit 31 outputs the comparison result as a signal dbe indicating a 2-3 pull-down phase shift. The predetermined threshold value for comparison in the comparison unit 31 is, for example, “1”. The output dbe from the comparison unit 31 in the sequence deviation detection unit 29 is output to the release signal generation unit 34.

  On the other hand, the scene change detection means 32 in the telecine release detection means 143 has a moving pixel cumulative value cnt from the predetermined area cumulative counter 13 and a predetermined threshold value STH set by the comparison threshold setting means 33. Entered. The scene change detection means 32 compares the moving pixel accumulated value cnt with the threshold value STH, and detects a scene change in the field based on the comparison result.

  Here, in general, an edit point in a video signal is highly likely to be a scene change, and in this case, most pixels in the field are determined to be moving pixels. Therefore, the moving pixel cumulative value cnt based on the difference from the field one frame before changes greatly compared to the value in the normal sequence. FIG. 4 shows a moving pixel accumulated value for each field when a field image from a telecine video signal having an editing point is processed by the difference detecting means 11, the comparing means 12, and the predetermined area accumulation counter 13 in the image simulation. It is a figure which shows the relationship between cnt (vertical axis) and field number (time, ie, horizontal axis). As shown in FIG. 4, the moving pixel accumulated value cnt greatly changes compared to the values in other fields at the scene change (field numbers 538 and 539 in FIG. 4) at the editing point. .

  Therefore, when the moving pixel cumulative value cnt is larger than the threshold value STH (that is, when more pixels than the predetermined threshold value in one field become moving pixels), the scene change detection unit 32 performs a scene change in that field. If there is, the scene change detection result sch is output as “1”, otherwise the scene change detection result sch is output as “0”. The threshold value STH for scene change detection is set by the comparison threshold value setting means 33, and the scene change detection result sch is output to the release signal generation means 34.

  The cancellation signal generation unit 34 in the telecine cancellation detection unit 143 includes a moving image continuous detection result from the moving image continuous detection unit 25, a still image continuous detection result from the comparison unit 28, and a sequence phase from the sequence deviation detection unit 29. A signal dbe indicating a deviation and a scene change detection result sch from the scene change detecting means 32 are input. The cancellation signal generation means 34 cancels the sequence detection signal when a switch or phase shift occurs from the telecine video signal or when the conditions of the telecine sequence are not satisfied (that is, when the input video signal is a telecine sequence). A release signal for generating the detection signal is generated based on one of the input detection results. For example, the moving image continuous detection result from the moving image continuous detection unit 25, the still image continuous detection result from the comparison unit 28, the signal dbe indicating the sequence phase shift from the sequence shift detection unit 29, and the scene change detection unit 32 When any one or more of the scene change detection results sch becomes “1”, the telecine release signal rst is set to “1”, and when the telecine release is not released, rst is set to “0”. In this case, a case where a moving image or a still image is detected to continue for a predetermined field (5 fields), a case where a 2-3 pull-down phase is shifted during detection of a telecine video signal, and a case where a scene change is detected. In either case, the release signal rst is set to “1”.

  The generation of the release signal rst in the release signal generation unit 34 is not limited to the above condition. For example, the moving image continuous detection result from the moving image continuous detection unit 25 and the still image continuous detection result from the comparison unit 28 When two or more detection results are “1” from the signal dbe indicating the phase shift of the sequence from the sequence deviation detection unit 29 and the scene change detection result sch from the scene change detection unit 32. Alternatively, when each detection result becomes “1” in a predetermined combination of detection results, a release signal rst having a value “1” may be output. Also, a moving image or a still image is displayed in a predetermined field (5 fields) based on a moving image continuous detection result from the moving image continuous detection unit 25, a still image continuous detection result from the comparison unit 28, and a scene change detection result sch from the scene change detection unit 32. It is also possible to set as a condition for outputting a release signal rst having a value of “1” when it is detected that a sequence is detected and when a scene change is detected.

The telecine sequence determination unit 142 includes a field still image detection result stl ₁ from the first still image detection unit 21 a, a moving image continuous number mvf from the moving image field counter 22 to the previous field, and a telecine system location detection unit 143. The release signal rst is input. The telecine sequence determination unit 142 detects a telecine sequence repetition condition, determines whether the telecine sequence is a telecine sequence, and outputs a telecine sequence detection signal tci ₀ indicating the sequence detection result. Below, each block which comprises the telecine sequence determination means 142 is demonstrated.

The telecine start counter 24 in the telecine sequence determination unit 142 includes a field still image detection result stl ₁ from the first still image detection unit 21a, a moving image continuous number mvf from the moving image field counter 22 to the previous field, A release signal rst from the release signal generation means 34 is input as a reset signal. The telecine activation counter 24 detects a case where a five-field telecine sequence that becomes a still image field is detected after four moving image fields are continued based on the still image detection result st1 ₁ and the moving image continuous number mvf up to the previous field. Count. When the release signal rst from the release signal generation unit 34 is “1” (that is, rst = 1), the count value oncnt of the telecine sequence is reset to zero. That is, when the still image detection result stl ₁ is “1” (still image) and the moving image continuation number mvf up to the previous field is “4”, the telecine video signal is detected as a sequence of five fields. Count the number of sequence repetitions. When “1” is input as the release signal rst from the release signal generation means 34, the input video signal is not a telecine video signal and the count value is set to zero. After resetting by the release signal rst, the above five fields are again set. Waiting for the input of the field which is the condition of each telecine sequence, starts counting the number of sequence repetitions from '0'. The count value oncnt of the telecine sequence by the telecine activation counter 24 is output to the sequence detection signal generation means 36.

The activation count value setting unit 37 in the telecine sequence determination unit 142 sets the number of repetitions of the telecine sequence until the telecine sequence count value oncnt output from the telecine activation counter 24 is detected as the telecine sequence, The sequence detection signal is output as an activation count value TH ₁ until activation.

The sequence detection signal generation means 36 in the telecine sequence determination means 142 receives the telecine sequence count value oncnt from the telecine activation counter 24 and the activation count value TH ₁ set by the activation count value setting means 37. Sequence detection signal generating unit 36, a telecine sequence count value oncnt from telecine startup counter 24, compares the activation count value TH _1, when the telecine sequence count value oncnt becomes activation count value TH ₁ or more, i.e., When a telecine sequence of 5 fields is continuously detected a predetermined number of times, the detection signal tci ₀ indicating the sequence detection result is set to “1”, and when the telecine sequence count value oncnt is smaller than the activation count value TH ₁ , the detection signal Output tci ₀ as '0'. When the telecine sequence detection signal tci ₀ is “0”, the telecine sequence is not counted (not a telecine video signal) or the sequence count value is reset to zero until it is detected. Note that the value of the sequence detection signal is not limited to this, and it is only necessary to be able to discriminate between a case where the telecine sequence is continuously detected a predetermined number of times and the other case. A telecine sequence detection signal tci ₀ that is an output from the sequence detection signal generation means 36 is sent to the sequence deviation detection means 31 and also output to the prediction control means 16.

Next, the appearance frequency detection unit 15 in the telecine detection unit 6 receives the still image detection result stl ₁ output from the sequence detection unit 14, the moving image continuation number mvf, and the telecine sequence phase count value seq. The appearance frequency detecting means 15 monitors the sequence of the input video signal and detects the appearance frequency of the telecine sequence, thereby determining whether or not the video signal satisfies the condition of the appearance frequency of the telecine sequence (that is, the telecine video signal). To determine the certainty)

FIG. 5 is a block diagram illustrating the configuration of the appearance frequency detection unit 15 and the partial configuration of the sequence detection unit 14 in the video signal processing apparatus according to the first embodiment. As shown in FIG. 5, the appearance frequency detection unit 15 includes a still image detection result stl ₁ obtained from the first still image detection unit 21 a, the moving image field counter 22, and the telecine sequence phase counter 23 in the sequence detection unit 14. The moving image continuous number mvf and the telecine sequence phase count value seq are input. However, the appearance frequency detection means 15 may be configured to have the same means as the first still image detection means 21a, the moving image field counter 22, and the telecine sequence phase counter 23. In this case, the moving picture cumulative value cnt output from the intra-predetermined area cumulative counter 13 in the correlation detecting means 120 is input, and still picture detection serving as a telecine sequence detection condition in the appearance frequency detecting means 15 is detected. As a result, stl ₁ , the continuous number mvf of the moving image, and the phase count value seq of the telecine sequence are obtained.

In the following description, a case will be described in which the appearance frequency detection unit 15 receives the still image detection result stl ₁ output from the sequence detection unit 14, the moving image continuous number mvf, and the phase count value seq of the telecine sequence.

As shown in FIG. 5, the appearance frequency detection means 15 in the telecine detection means 6 of Embodiment 1 includes a sequence determination number detection means 151 and a probability determination means 152. The sequence determination number detection means 151 monitors the sequence condition in the input video signal over a relatively long time (field), and counts the number of times determined as a telecine sequence. The sequence determination number detection unit 151 includes an appearance frequency counter 40, a still image continuous detection unit 41, a count value adjustment unit 42, a maximum value setting unit 43, and a count value initialization unit 44. Also, likelihood decision section 152 compares the count value tc output from the sequence determination count detecting unit 151 with a predetermined threshold value TH _2, shown certainty that the comparison result is a telecine converted video signal index Is output as a predictive control signal tciflg (that is, the likelihood of being a telecine video signal is determined and the determination result is output).

First, the still image detection result stl ₁ output from the sequence detection unit 14, the moving image continuous number mvf, and the telecine sequence phase count value seq are input to the sequence determination number detection unit 151. The sequence determination number detection means 151 monitors the sequence condition in the input video signal over a relatively long field, and counts the number of times determined as a telecine sequence. The sequence determination number detection means 151 adds a predetermined value when the telecine sequence condition is detected, and on the other hand, if the telecine sequence condition is not detected every five fields and is not determined as the telecine sequence, the sequence determination number detection means 151 determines the predetermined value from the count value. The value of is subtracted.

The still image continuous detection means 41 in the sequence determination number detection means 151 receives the still image detection result stl ₁ and the telecine sequence phase count value seq. The still image continuous detection means 41 counts the field in which the still image detection result stl ₁ becomes “1” (still image) for each cycle of the sequence phase count value seq synchronized with the 2-3 pull-down phase, and the sequence phase A case is detected where all of the five fields indicated by the count value seq are still picture fields. The five-field continuous detection result of the still image is output to the appearance frequency counter 40.

The appearance frequency counter 40 is input with the still image detection result stl _{1 of the} field, which is the detection condition of the telecine sequence, from the sequence detection means 14, the moving picture continuous number mvf up to the previous field, and the telecine sequence phase count value seq In addition, the five-field continuous detection result of the still image by the still image continuous detection unit 41 and the set values set in each of the count value adjusting unit 42, the maximum value setting unit 43, and the count value initializing unit 44 are obtained. Entered.

The appearance frequency counter 40 calculates a predetermined value Ad based on the still image detection result stl ₁ , the moving image continuous number mvf, the telecine sequence phase count value seq, and the still image continuous detection result 41 by the still image continuous detection unit 41. It is an up / down counter for adding or subtracting a predetermined value Su. The appearance frequency counter 40 monitors the sequence condition in the input video signal over a relatively long time (field), and counts the number of times determined as a telecine sequence. The appearance frequency counter 40 determines that the input video signal is a telecine sequence, that is, the still image detection result stl ₁ is “1” (still image), and the moving image continuous number mvf up to the previous field is “4”. In this case, the predetermined value Ad is added to the count value tc (that is, tc ← tc + Ad). Even when the appearance frequency counter 40 is in the phase of the fifth field (that is, the telecine sequence phase count value seq is “0” and the position of the still image once in five fields), the still image detection result stl ₁ is “ When the sequence condition that is 1 '(still image) and the moving image continuation number mvf up to the previous field is not 4 is detected, that is, when it is not determined to be a telecine sequence, the predetermined value Su is calculated from the count value tc. Subtract (ie, tc ← tc-Su). However, the 5 field sequence detection result of the still image from the still image continuous detection unit 41, when a still image is continuously 5 field is detected, the still image detection result stl ₁ is '1' in the (still) There is no addition or subtraction of the count value tc (that is, tc ← tc ± 0) even if the sequence condition where the moving image continuation number mvf is “4” is not detected. This is because when still images are continuous, there are cases where the still images are continuous telecine video signals, and it is impossible to determine whether or not the telecine sequence is present.

In the above description, when the predetermined value Su is subtracted from the count value tc (when the telecine sequence is not determined), the sequence condition is not detected even if the position of the still image is once in 5 fields. It is also possible not to determine a telecine sequence only when the still image detection result stl ₁ = 0 (moving image) at the position of a still image once in five fields. At this time, even if the telecine sequence phase count value seq is “0”, the predetermined value Su is subtracted from the count value tc when the still image detection result stl ₁ = 0 (moving image).

This is because, when the still image detection result stl ₁ = 1 (still image) at the position of a still image once in 5 fields, the moving image continuous number mvf = “4”, which is one of the above sequence conditions, This is because there is a case where the telecine sequence is in progress (eg, switching from a still image to a moving image in the telecine sequence), and there is a case where it cannot be determined whether or not the telecine sequence is present. Only when the still image detection result stl ₁ = 0 (moving image) at the position of the still image once in 5 fields is determined not to be a telecine sequence, it is removed from the subtraction target of the above condition, and the count value It is also possible not to add or subtract tc.

  The count value adjusting means 42 adjusts the balance ratio between the addition value Ad and the subtraction value Su in the count in the appearance frequency counter 40. For example, a value corresponding to the subtraction value Su when the addition value Ad is set to “1”. Is output to the appearance frequency counter 40. By increasing the subtraction value Su when the telecine sequence is not determined to be larger than the addition value Ad when the telecine sequence is determined, the vertical fluctuation range in the count of the number of determinations of the telecine sequence is adjusted. That is, the degree of determination as a telecine sequence can be adjusted by the balance ratio of the addition value Ad and the subtraction value Su set by the count value adjusting means 42. The addition value and the subtraction value in the count in the appearance frequency counter 40 are set based on the values from the count value adjustment unit 42.

  The maximum value setting means 43 sets the maximum count value TMAX in the appearance frequency counter 40. The appearance frequency counter 40 can count up to the maximum value TMAX set by the maximum value setting means 43.

  The count value initialization means 44 sets an initialization enable signal and an initialization value INTCNT and outputs them to the appearance frequency counter 40 in order to initialize the count in the appearance frequency counter 40. Thus, the appearance frequency count can be set to the initialization value INTCNT, and the count value in the appearance frequency counter 40 is set to the initialization value INTCNT when the initialization enable signal is input. When the video signal is switched during the setting by the count value initialization means 44, the count in the appearance frequency counter 40 can be initialized and the count can be restarted.

  A count value (appearance frequency count value) tc that is the number of sequence determinations in the appearance frequency counter 40 is sent to the prediction flag generation unit 45 in the probability determination unit 152.

  Next, the probability determination unit 152 receives the appearance frequency count value tc from the sequence determination number detection unit 151, determines the probability of being a telecine video signal, and indicates whether or not it is determined to be probable. The prediction control flag tciflg is output. The probability determination unit 152 includes a prediction control flag generation unit 45 and an effective count value setting unit 46.

The effective count value setting unit 46 sets the appearance frequency (the number of telecine sequence determinations) until it is determined to be a telecine video signal with respect to the appearance frequency count value tc output from the appearance frequency counter 40 in the sequence determination number detection unit 151. It is set and output as an effective count value TH ₂ for determining the likelihood of being a telecine video signal. The valid count value TH _2, will adjust the time until it is determined that telecine video signal.

The predictive control flag generating unit 45 receives the appearance frequency count value tc output from the appearance frequency counter 40 and the valid count value TH ₂ set by the valid count value setting unit 46. Predictive control flag generation unit 45, the appearance comparison frequency count value tc and the effective count value TH ₂ from the occurrence frequency counter 40 determines the likelihood of being a telecine video signal. That is, by comparing the occurrence frequency count value tc and the effective count value TH _2, when the occurrence frequency count value tc is enabled count value TH ₂ or more, and determined to be a telecine video signal, the predictive control flag tciflg '1 'And. When the occurrence frequency count value tc the effective count value TH ₂ smaller, it is determined that not like telecine video signal, the predictive control flag Tciflg does not generate, and the predictive control flag tciflg '0'. The prediction control flag tciflg, which is an output from the prediction control flag generation unit 45, is output to the prediction control unit 16.

Next, the prediction control means 16 in the telecine detection means 6 receives the telecine sequence detection signal tci ₀ that is output from the sequence detection means 14 and the prediction control flag tciflg output from the appearance frequency detection means 15. . The prediction control means 16 controls the detection result of the telecine sequence in the sequence detection means 14 based on the prediction control flag tciflg indicating the certainty of being a telecine video signal determined by the appearance frequency detection means 15, and the telecine video signal Telecine detection signal tci indicating the detection of. FIG. 6 is a block diagram illustrating a configuration example of the prediction control unit 16. The prediction control means 16 has a switching means 50 for controlling the telecine sequence detection result tci ₀ in the sequence detection means 14.

The switching means 50 in the prediction control means 16 receives the telecine sequence detection signal tci _{0 as} an output from the sequence detection means 14 and the prediction control flag tciflg output from the appearance frequency detection means 15 to detect the appearance frequency. Based on the prediction control flag tciflg from the means 15, the telecine sequence detection signal tci ₀ from the sequence detection means 14 and the fixed signal are switched. When the predictive control flag tciflg is input as '1', the switching unit 50 determines that the video signal is a telecine video signal, selects the telecine sequence detection signal tci ₀ by the sequence detection unit 14, and detects the telecine video signal. The telecine detection signal tci shown in FIG. On the other hand, when the prediction control flag tciflg is “0”, the switching means 50 determines the field period (appearance frequency count value tc is valid) when it is determined that it is not a telecine video signal or when it is determined to be a telecine video signal. The time until the count value TH becomes equal to or greater than ₂ ), the telecine sequence detection signal tci ₀ by the sequence detection means 14 is not selected, but the fixed signal tci (value “0”) is selected. At this time, even if the telecine sequence detection signal tci ₀ temporarily satisfies a normal telecine sequence condition and the telecine sequence detection signal tci ₀ is “1”, the telecine processing is not started.

  The telecine detection signal tci indicating the detection of the telecine video signal controlled by the prediction control means 16 is sent as a control signal to the selection means 8 in the interpolation signal generation means 110. If the prediction control means 16 determines that the telecine video signal does not appear, the telecine detection signal tci is “0”. Therefore, the selection means 8 in FIG. The interpolation signal Im from the means 5 is selected. If it is determined that the video signal is a telecine video signal, the telecine processing is started based on the result of sequence detection by the sequence detection means 14.

Next, a specific description will be given of the operation of detecting and repeating the telecine sequence detection signal tci ₀ by detecting the repetition condition of the telecine sequence of 5 fields in the sequence detection means 14 in the telecine detection means 6. FIG. 7 shows the number of repetitions of the telecine sequence executed by the first still image detection means 21a in the sequence detection means 14 in the telecine detection means 6 and the telecine sequence phase counter 23 and the telecine activation counter 24. It is a flowchart explaining the process until the count of. As described above, telecine detection is performed for each field, and the process shown in FIG. 7 is executed in units of one field.

  First, the operation of the sequence detecting means 14 in the telecine detecting means 6 when a telecine video signal having no editing point or the like and having a 2-3 pull-down phase sent regularly is input from the input terminal 100 will be described.

  FIGS. 8A to 8C are diagrams showing a 2-3 pulldown telecine conversion. FIG. 8A is a film image of 24 frames / second, and FIG. 8B is a 2-3 pulldown method. The telecine-converted telecine video signal, (c) in the figure shows field numbers. As shown in FIGS. 8A to 8C, the first frame A of the signal of the movie film or the like corresponds to the first and second fields At and Ab of the video signal, and the second of the signal of the movie film or the like. The frame B corresponds to the third to fifth fields Bt, Bb, Bt of the video signal, and the third frame C of the signal of the movie film or the like corresponds to the sixth and seventh fields Cb, Ct of the video signal. Are converted so as to correspond to Db, Dt, Db of the eighth to tenth fields of the video signal. The subscript t of the symbols At and Bt represents a top field that is a relatively upper line field, and the subscript b of the symbols Ab and Bb represents a bottom field that is a lower line field.

  As shown in FIGS. 8A to 8C, the third field Bt and the fifth field Bt are fields having the same contents, and the eighth field Db and the tenth field Db are fields having the same contents. . Thus, in the telecine video signal telecine-converted by the 2-3 pull-down method, the same field as the previous two fields is repeated once every five fields. Accordingly, the inter-frame difference information obtained by the difference detection unit 11 in the correlation detection unit 120 is zero or less than a predetermined threshold (in consideration of noise close to zero) during detection in the fifth field and detection in the tenth field. Value). This 1-frame difference information relationship is repeated once every 5 fields.

  FIGS. 9A to 9D are diagrams for explaining the relationship between the telecine interpolation and the interpolation phase flag tcf when the telecine video signal is detected and IP converted. FIG. 9A shows the field number, FIG. 4B shows an interlaced video signal which is a telecine video signal, FIG. 4C shows an interpolation phase, and FIG. 4D shows a progressive video signal. The interpolation scanning line signal generation process is performed on the one-field delay signal. With respect to the target telecine video signal field, the first field is a temporally subsequent field (that is, the current field signal. In FIG. 9C, the second field is the interpolation phase “after”). , The second field is the previous field in time (that is, the two-field delay signal. In FIG. 9C, the interpolation phase is indicated as “before”), and the third field is the time. The fourth field, which is a subsequent field, is repeated, and the fourth and fifth fields are repeated so that the third and fourth fields, which are temporally previous fields, respectively correspond to the interpolation phase. Then, by performing telecine interpolation according to the interpolation phase, a progressive video signal restored to the original frame (corresponding to the A frame, B frame,... In FIG. 8A) is obtained and output.

FIGS. 10A to 10G are diagrams for explaining the operation of the sequence detection means 14 in the telecine detection means 6 in the video signal processing apparatus according to the first embodiment, in which FIG. (B) is an interlaced video signal which is a telecine video signal, (c) is the output stl ₁ of the first still image detection means 21a in the sequence detection means 14, and (d) is the sequence detection means 14. (M) is the output seq of the telecine sequence phase counter 23 in the sequence detecting means 14, and (f) is the output oncnt of the telecine activation counter 24 in the sequence detecting means 14. FIG. 5G shows the output tci ₀ of the sequence detection signal generation means 36 in the sequence detection means 14. Hereinafter, the telecine sequence detection operation will be described with reference to FIGS. 7 and 10A to 10G.

The difference detection means 11 in the telecine detection means 6 detects the inter-frame difference information between the current field signal Ia and the two-field delay signal Ic, and the comparison means 12 binarizes the inter-frame difference information, and a predetermined area. In the inner accumulation counter 13, the number of moving pixels in a predetermined area is accumulated to obtain the number of moving pixels in the field. In FIG. 7, the moving pixel accumulated value cnt for one field period is inputted to the sequence detecting means 14 (step S101), and the moving picture accumulated value cnt is compared with a predetermined threshold value STL_TH ₁ by the first still image detecting means 21a. (Step S102). Video element cumulative value cnt is if the predetermined threshold STL_TH ₁ less than the still image detection result stl ₁ for that field as '1', to detect the still image field (step S103). In other cases, the moving image field is detected by setting the still image detection result st1 ₁ for the field to “0” (step S104).

Here, since the accumulated moving pixel value cnt in one field period is a value obtained by accumulating moving pixels in the field, the still image detection result based on the difference between the input current field signal Ia and the two-field delayed signal Ic is: The next field (one-field delay signal Ib) is output in time. Therefore, as shown in FIG. 10C, the still image detection result stl ₁ is output in time with the next field of the input signal, and the field positions after the fifth field and the tenth field (the sixth and sixth fields). In the eleventh field), the still image detection result st1 ₁ becomes “1” (still image, “S” in the figure), and the complete still image field is detected once in five fields.

Next, in the moving image field counter 22, when the still image detection result stl ₁ is “1” (step S105), the moving image continuous number mvf is reset to zero (step S106), and the still image detection result stl ₁ is “0”. In the case of '(step S105), one count is performed (step S107), the timing is adjusted to the next field, and the counted number of continuous video fields mvf is obtained (FIG. 10 (d)). The telecine sequence phase counter 23 repeatedly counts from “0” to “4”, which is a five-field period for each field, based on the still image detection result st1 ₁ and the moving image continuous number mvf up to the previous field (steps S108 and S110). ). However, when the still image detection result stl ₁ is “1” and the moving image continuation number mvf up to the previous field is “4”, the sequence phase count value seq is set to “0” (step S109).

FIG. 10E shows the sequence phase count value seq, the field when the still image detection result stl ₁ is “1” and the moving image continuous number mvf up to the previous field is “4”, and the sequence phase The count value seq is “0”. As shown in FIG. 10E, the sequence phase count value seq is repeated in units of 5 fields, and since the interpolation target field is a 1-field delayed signal, the sequence phase count value seq is “0”. Is the position of the field in which the same field as the previous two fields is repeated once in five fields of the telecine video signal.

  FIGS. 11A to 11E show the sequence phase count value seq and the interpolation phase flag generated by the interpolation phase flag generation means 35 in the video signal processing apparatus according to the first embodiment at the time of 2-3 pull-down telecine interpolation. It is a figure for demonstrating the relationship of tcf, the figure (a) is a field number, the figure (b) is the output of the telecine sequence phase counter 23, the figure (c) is an interpolation phase flag tcf, the figure (d) ) Shows a one-field delayed signal Ib, and FIG. 9E shows a progressive video signal Prog after interpolation. When the telecine sequence phase count value seq is “1” or “3”, the input current field signal and 1-field delay signal are fields from the same frame, and the telecine sequence phase count value seq is “0” or “2”. In the case of ', the 2-field delay signal and the 1-field delay signal form a field sequence from the same frame. When the telecine sequence phase count value seq is “4”, the input current field signal and the two-field delay signal are fields having the same contents. Therefore, the interpolation phase flag generation means 35 determines the interpolation phase flag tcf according to the sequence phase count value seq. For example, when the sequence phase count value seq is '1' or '3', the interpolation phase flag tcf is set to '0' so that telecine interpolation is performed from the input current field signal (subsequent field), and the sequence phase count value When seq is “0” or “2”, the interpolation phase flag tcf is set to “1” so that telecine interpolation is performed from the two-field delay signal (previous field). When the sequence phase count value seq is “4”, telecine interpolation can be performed from the current field or the two-field delayed signal, but it is considered that the telecine sequence is detected based on the difference from the field one frame before. 2. Telecine interpolation is performed from the two-field delay signal (previous field).

In FIG. 7, when the value “1” is input as the cancellation signal rst from the cancellation signal generation unit 34, the telecine activation counter 24 resets the count value assuming that the input video signal is not a telecine video signal (oncnt = 0). (Steps S111 and S113). When the telecine video signal is input, the release signal rst is “0” (step S111), and the telecine sequence condition is detected based on the still image detection result st1 ₁ and the moving image continuation number mvf up to the previous field (step S111). S112). A still image detection result stl ₁ is '1' (still image), and moving the consecutive number mvf the time field of '4', to count the number of repetitions of the telecine sequence (step S114).

FIG. 10 (f) shows the count value onnt in the telecine activation counter 24. When the still image detection result stl ₁ is “1” (still image) and the moving image continuous number mvf is “4”, “1” is added to the count value oncnt (ie, oncnt ← oncnt + 1) ), Counting the number of telecine sequence repetitions. In sequence detection signal generating means 36 compares the activation count value TH ₁ and telecine sequence count value oncnt, telecine sequence count value oncnt becomes activation count value TH ₁ or more, the sequence is continuously detected _once TH Then, the telecine sequence detection signal tci ₀ indicating the sequence detection result is set to “1”. The telecine sequence detection signal tci _{0 in} FIG. 10 (g) shows a case where the sequence count is, for example, two times or more and it is detected that the input video signal is a telecine video signal (when TH ₁ = 2). . Therefore, when the telecine sequence of 5 fields is continuously detected twice or more and the telecine sequence detection signal tci ₀ becomes “1”, it is determined that the input video signal satisfies the sequence condition of the telecine video signal. As tci ₀ , “1” is output to the prediction control means 16.

The telecine sequence detection signal tci ₀ from the sequence detection unit 14 is input with “1” as the prediction control flag tciflg from the appearance frequency detection unit 15, and is determined to be a telecine video signal, the prediction control unit 16. Is output as a telecine detection signal tci indicating the detection of the telecine video signal. The telecine detection signal tci selected by the prediction control means 16 is sent to the selection means 8 as a control signal. When the telecine detection signal tci is “0” (in this case, tci ₀ = 0), the selection means in FIG. 8, the signal from the motion adaptive interpolation processing means 5 is selected. When the telecine detection signal tci is “1” (in this case, tci ₀ = 1), the telecine processing is started, and the telecine interpolation processing means 7 Select the signal.

When the telecine video signal is switched to a video signal for normal television broadcast or the like, the difference information between the frames detected by the difference detecting unit 11 becomes a large value, and the first still image detecting unit 21a. In the still image detection result stl ₁ output from “0”, “0” (moving image) is continuous. Therefore, at the time when stl ₁ becomes “0” for 5 consecutive fields, the detection result of the continuous 5 fields of moving image is output from the moving image detection unit 25 to the cancellation signal generation unit 34, and the cancellation signal generation unit 34 The value “1” is sent to the telecine activation counter 24 as the release signal rst. When “1” is input as the release signal rst, the count value is reset (oncnt = 0) on the assumption that the input video signal is not a telecine video signal (steps S111 and S113 in FIG. 7), and the sequence In the detection signal generation means 36, the telecine sequence detection signal tci ₀ becomes “0”.

When the telecine video signal is switched to a video signal having a continuous still image field, the interframe difference information detected by the difference detecting means 11 becomes a small value, and the second still image detecting means 21b In the output still image detection result stl ₂ , “1” (still image) is continuous. Therefore, when the still image field detection unit 27 counts five still image fields continuously, the comparison unit 28 detects that five still image fields continue, and the detection result is output to the release signal generation unit 34. The The cancellation signal generation means 34 sends a cancellation signal rst having a value of “1” to the telecine activation counter 24. When “1” is input as the cancellation signal rst, the input video signal is not a telecine video signal. As a result, the count value is reset (oncnt = 0) (steps S111 and S113 in FIG. 7), and the telecine sequence detection signal tci ₀ becomes “0” in the sequence detection signal generation means 36.

12 (a) to 12 (k) show the video signal processing apparatus according to Embodiment 1 in which the field sequence is changed in the middle of a telecine video signal by editing for broadcasting, insertion of CM or telop, and the like. It is a figure for demonstrating operation | movement of the telecine detection means 6 when the telecine video signal with which regularity was disturbed is input from the input terminal 100, The figure (a) is a field number, The figure (b) is input. The video signal Ia, FIG. 10C shows the output stl ₁ of the first still picture detecting means 21a, FIG. 11D shows the output mvf of the moving picture field counter 22, and FIG. 9E shows the output of the telecine sequence phase counter 23. seq, (f) the interpolation phase flag tcf, FIG (g) is output stl ₃ of the third still image detection unit 21c, FIG. (h) the output of the sequence in the still image counter 30 (I) is the output dbe of the comparison means 31 in the sequence deviation detection means, (j) is the output oncnt of the telecine activation counter 24, and (k) is the telecine sequence output from the sequence detection means 14. The detection signal tci ₀ is shown.

  FIG. 12B shows a case where an edit point exists in the sixth field in the middle of the telecine video signal, and the regularity of the sequence is disturbed in the sixth field Xb. In FIG. 12B, the third field Bt and the fifth field Bt are fields having the same contents, and the sixth field Xb and the eighth field Xb are examples of fields having the same contents.

  12C to 12K are diagrams for explaining the telecine sequence detection operation in the sequence detection means 14 in the telecine detection means 6 when the telecine video signal as shown in FIG. 12B is input. FIG. Telecine sequence phase counter 23, interpolation phase flag from moving pixel cumulative value cnt input from predetermined area cumulative counter 13 and detection of still picture field in first still picture detecting means 21a shown in FIGS. The basic operation of the generating means 35 is the same as that when detecting the telecine video signal described above.

Video element cumulative value cnt of one field period unit input to the sequence detection means 14 is also sent to the third still picture detecting means 21c, it compares the video element cumulative value cnt to a predetermined threshold STL_TH _3. If Video element cumulative value cnt predetermined threshold STL_TH ₃ smaller than, and its fields a still image detection result stl ₃ for '1' (still picture), otherwise, the detection result stl ₃ '0' (Movie). This operation is the same as the operation of the first still image detection means 21a. As shown in FIG. 12G, the still image detection result stl ₃ is output in time with the next field with respect to the input signal, and the field positions after the fifth field and the eighth field (sixth and sixth fields). 9 field), the still image detection result stl ₃ is “1” (still image, “S” in the figure).

The moving picture field counter 22 outputs the continuous number mvf of moving picture fields up to the previous field (FIG. 12 (d)). Telecine sequence phase counter 23 is repeatedly counts up from every five fields' 0 '' 4 ', a still image detection result stl ₁ is'1', and, moving the continuous number mvf up to the previous field ' In the field of 4 ′, the sequence phase count value seq is “0”.

Since there is an edit point in the sixth field, the continuous number mvf of the moving image field is mvf even though the still image detection result stl ₁ is “1” after the eighth field (after the ninth field). 2 ', the sequence phase count value seq is not reset to zero, and a sequence phase shift occurs.

  Therefore, the sequence deviation detecting means 29 detects the existence of a still picture field in a field different from one still picture field every five fields in order to discriminate the above-described 2-3 pulldown sequence phase deviation. To do.

When the telecine sequence detection signal tci ₀ is “1”, the in-sequence still image counter 30 in the sequence deviation detection unit 29 first resets the counter value to zero each time the sequence phase count value seq becomes “0”. . From FIG. 12 (h), when the sequence phase of the telecine video signal is sent regularly (up to the sixth field), the field whose sequence phase count value seq is '0' (That is, one still picture field every five fields), and in this field, the count value of the still picture counter 30 in the sequence is reset to zero. Then, until the next reset to zero (until the still image field of the next field sequence), the still image detection result stl ₃ from the third still image detection means 21c is “1” (FIG. 12 (g )) Is counted. As a result, a case where a still image is generated in a field different from one still image field every five fields is detected, and the number of detected fields is output. In FIG. 12 (h), when the still image detection result st1 ₃ becomes “1” in the ninth field, the still image counter 30 in the sequence counts still images.

  The comparison means 31 in the sequence deviation detection means 29 compares the count value from the in-sequence still image counter 30 with a predetermined threshold value (for example, the threshold value is “1”). The still image detection result dbe in the middle of the field sequence is set to “1” (FIG. 12I).

The output dbe from the comparison unit 31 in the sequence deviation detection unit 29 is output to the release signal generation unit 34. In the release signal generation unit 34, when the result of the sequence deviation detection unit 29 is set to be used, when the output dbe from the comparison unit 31 is "1", the release signal rst is set to "1" and the release signal rst is set to the telecine. Send to start counter 24. When “1” is input as the release signal rst, the count value is reset (oncnt = 0) on the assumption that the input video signal is not a telecine video signal (FIG. 12 (j)), and the sequence detection signal generating means At 36, the telecine sequence detection signal tci ₀ becomes “0” (FIG. 12 (k)). Therefore, when a sequence phase shift is detected in the middle of the telecine video signal, the telecine sequence detection signal tci ₀ is canceled to “0”. Even after the cancellation, the sequence detecting means 14 performs the operation of detecting the telecine video signal, and if the five-field sequence is regularly input and detected correctly, the input video signal is converted into the telecine video signal. As a result, the telecine sequence detection signal tci ₀ becomes “1” again and is output to the prediction control means 16.

When the prediction control flag tciflg from the appearance frequency detection means 15 is “1” and it is determined that the signal is a telecine video signal, the switching means 50 in the prediction control means 16 uses the telecine sequence detection signal from the sequence detection means 14. tci ₀ is output as a telecine detection signal tci indicating the detection of the telecine video signal. The telecine detection signal tci selected by the prediction control means 16 is sent to the selection means 8 as a control signal. When the telecine detection signal tci is “0” (at this time tci ₀ = 0), the selection means 8 moves. When the signal from the adaptive interpolation processing means 5 is selected and the telecine detection signal tci is “1” (in this case, tci ₀ = 1), the telecine processing is started and the signal from the telecine interpolation processing means 7 is selected. .

FIGS. 13A to 13F show the telecine detection signal tci (provided that the prediction control flag tciflg is “1” and the telecine video signal when the sequence phase is shifted in the video signal processing apparatus according to the first embodiment. And (b) is a diagram for explaining the operation of telecine interpolation based on the result of the sequence deviation detection means 29 in the sequence detection means. The output seq of the telecine sequence phase counter 23, (c) is the interpolation phase flag tcf, (d) is the telecine detection signal tci output from the telecine detection means 6, and (e) is the one-field delay signal Ib. FIG. 5F shows the progressive video signal Prog after interpolation. When the telecine detection signal tci is “1” (at this time, tci ₀ = 1), telecine processing is performed, and the field sequence is changed in the middle of the telecine video signal, and the regularity of the sequence is disturbed. If this is detected, the telecine detection signal tci is set to “0” (telecine sequence detection signal tci ₀ = 0), and the signal from the motion adaptive interpolation processing means 5 is selected.

Therefore, when it is detected that the field sequence is changed and the regularity of the sequence is disturbed in the middle of the telecine video signal, the telecine sequence detection signal tci _{0 is set} to zero to temporarily detect that the telecine sequence has been detected. The signal from the motion adaptive interpolation processing means 5 is selected until the telecine sequence is accurately detected without performing the telecine interpolation signal with the wrong phase.

FIGS. 14A to 14I are diagrams for explaining the operation of the scene change detecting means 32, where FIG. 14A is a field number, and FIG. 14B is an interlaced video signal which is a current field signal. Ia, (c) is the output stl ₁ of the first still image detecting means 21a, (d) is the output mvf of the moving picture field counter 22, (e) is the output seq of the telecine sequence phase counter 23, FIG. 8F shows the interpolation phase flag tcf, FIG. 10G shows the output sch of the scene change detection means 32, FIG. 11H shows the output oncnt of the telecine activation counter 24, and FIG. Shows the telecine sequence detection signal tci ₀ output from. FIGS. 14A to 14I illustrate the operation of the telecine detection means 6 when a video signal that causes a scene change is input from the input terminal 100 in the middle of the telecine video signal.

  FIG. 14B shows a case where an edit point exists in the sixth field in the middle of the telecine video signal and a scene change occurs in the sixth field Xb. FIG. 14B shows an example in which the third field Bt and the fifth field Bt are fields having the same contents.

  FIGS. 14C to 14I show the telecine sequence detection operation in the sequence detection means 14 when the telecine video signal as shown in FIG. 14B is input. Telecine sequence phase counter 23, interpolation phase flag from moving pixel cumulative value cnt input from predetermined area cumulative counter 13 and detection of still picture field in first still picture detecting means 21a shown in FIGS. 14 (c) to 14 (f). The basic operation of the generating means 35 is the same as that when detecting the telecine video signal described above.

  The accumulated moving pixel value cnt in one field period input to the sequence detecting means 14 is also sent to the scene change detecting means 32, and the moving pixel accumulated value cnt is compared with the threshold value STH, and the scene change in that field is determined. To detect. In the scene change, since most pixels in the field are determined to be moving pixels, the moving pixel accumulated value cnt based on the difference from the field one frame before changes greatly compared to the value in the normal sequence. . Therefore, when the moving pixel accumulated value cnt is larger than the threshold value STH, the scene change detection unit 32 outputs the value “1” as the scene change detection result sch, assuming that there is a scene change in the field.

  In order to compare the scene change detection result sch with the moving pixel accumulated value cnt based on the difference information from the previous frame, as shown in FIG. At the field position (sixth field) after the fifth field, the scene change detection result sch becomes “1”.

The scene change detection result sch from the scene change detection means 32 is output to the release signal generation means 34. In the cancellation signal generation unit 34, when the detection result in the scene change detection unit 32 is set to be used, when the scene change detection result sch is “1”, the cancellation signal rst is set to “1” and is sent to the telecine activation counter 24. . When “1” is input as the release signal rst, the count value is reset (oncnt = 0) on the assumption that the input video signal is not a telecine video signal (FIG. 14 (h)), and the sequence detection signal generating means At 36, the telecine sequence detection signal tci ₀ becomes “0” (FIG. 14 (i)). Therefore, when a scene change is detected in the middle of the telecine video signal, the telecine sequence detection signal tci ₀ is canceled to “0”. Even after the cancellation, the sequence detecting means 14 performs the operation of detecting the telecine video signal, and if the five-field sequence is regularly input and detected correctly, the input video signal is converted into the telecine video signal. As a result, the telecine sequence detection signal tci ₀ becomes “1” again, and the telecine sequence detection signal tci ₀ is outputted to the prediction control means 16.

Hereinafter, the operation in the appearance frequency detection unit 15 and the prediction control unit 16 is the same as the operation in the case where there is a shift in the sequence phase, but when a scene change is detected in the middle of the telecine video signal, The telecine sequence detection signal tci ₀ can be set to zero to temporarily cancel the detection of the telecine sequence. When operating in this way, the selection means 8 does not receive the signal from the motion adaptive interpolation processing means 5 until the telecine sequence is accurately detected without performing the telecine interpolation signal in the wrong phase. Select and output.

FIGS. 15A to 15F show that when a scene change is detected in the video signal processing device according to the first embodiment, the telecine detection signal tci (however, the prediction control flag tciflg = 1 is a telecine video signal). FIG. 4A is a field number, FIG. 2B is an output seq of a telecine sequence phase counter, and FIG. 2C is an interpolation. The phase flag tcf, (d) is a telecine detection signal tci output from the telecine detection means 6, (e) is a one-field delay signal (interpolated field signal), and (f) is a progressive signal Prog after interpolation. Indicates. As shown in FIGS. 15A to 15F, when the telecine detection signal tci is “1” (in this case, tci ₀ = 1) (that is, when the field number is before “6”). When the telecine process is performed and a scene change is detected in the middle of the telecine video signal (that is, when the field number is “7” or later), the telecine detection signal tci is “0” (telecine sequence detection signal tci _0. = 0), and the selection means 8 selects the signal from the motion adaptive interpolation processing means 5.

As described above, according to the sequence detection unit 14 of the first embodiment, the still image field is detected from the inter-frame difference information, the repetition condition of the five-field telecine sequence is detected, and the still image is detected by the sequence deviation detection unit 29. A phase shift due to a field is detected, the scene change detecting means 32 detects a scene change at an editing point in the middle of the sequence, and temporarily cancels the telecine sequence detection signal tci ₀ in the sequence detection signal generating means 36 (tci ₀ = 0). Therefore, even when there is a sequence phase shift in the telecine video signal or an edit point due to a scene change, the telecine video signal can be detected stably and image quality deterioration due to combing phenomenon generated by IP conversion can be reduced. IP conversion of a telecine video signal can be performed.

Next, it is an operation executed in the appearance frequency detection means 15 and the prediction control means 16, and it is confirmed that it is a telecine video signal by monitoring the sequence of the input video signal and detecting the appearance frequency of the telecine sequence. The operation of determining the likelihood and controlling the telecine sequence detection signal tci ₀ will be specifically described. The appearance frequency detection means 15 monitors the sequence conditions in the input video signal over a relatively long time (field) and detects the appearance frequency of the telecine sequence, thereby determining the likelihood of being a telecine video signal.

  FIG. 16 is a flowchart for explaining the operation of the appearance frequency detection means 15 in the video signal processing apparatus according to Embodiment 1 of the present invention. In the flowchart of FIG. 16, the appearance frequency detection means 15 monitors the sequence of the input video signal (that is, the output of the sequence detection means 14) and detects the appearance frequency of the telecine sequence. The process from determining the probability of being a signal to generating the predictive control flag tciflg is shown. As described above, telecine detection is performed for each field, and the process shown in FIG. 16 is performed in units of one field.

  First, the operation of the appearance frequency detection means 15 when a 2-3 pull-down telecine video signal as shown in FIG. 8B is input will be described based on the flowchart of FIG.

As shown in FIG. 16, the appearance frequency counter 40 in the appearance frequency detection means 15 indicates that the still image detection result stl ₁ is “1” (that is, a still image) and the number of continuous moving images mvf up to the previous field. It is determined whether or not the telecine sequence condition of “4” is satisfied (step S201). If the telecine sequence condition is satisfied, the value Ad is added to the appearance frequency count value tc of the appearance frequency counter (ie, tc ← tc + Ad) (step S203). Next, it is determined in the prediction control flag generation unit 45 compares the occurrence frequency count value tc and the effective count value TH _2, the certainty of being the telecine video signal (step S208). When the occurrence frequency count value tc is enabled count value TH ₂ or more, and determined to be a telecine video signal, the predictive control flag tciflg to '1' (step S210). Incidentally, a field period until it is determined that the likely telecine video signal (i.e., the period prior to the occurrence frequency count value tc becomes effective count value TH ₂ or more), and the predictive control flag tciflg '0' (step S209 ).

FIGS. 17A and 17B are diagrams for explaining the operation at the time of telecine video signal input in the appearance frequency detection means 15, and FIG. 17A shows the output value (appearance from the appearance frequency counter 40. (Frequency count value) tc, FIG. 5B shows the predictive control flag tciflg generated by the predictive control flag generating means 45. In FIGS. 17A and 17B, when the input video signal Ia is a telecine video signal, the telecine sequence condition (still image detection result stl ₁ = 1 and moving picture continuous number mvf = 4) is 5 fields. Therefore, the value Ad is added to the appearance frequency count value tc every time it is determined whether the telecine sequence condition is satisfied (that is, tc ← tc + Ad) (FIG. 17A ) And (b) periods a and b). When the appearance frequency count value tc reaches the maximum value TMAX, the count value tc is clipped to the maximum value TMAX (the period of the value TMAX within the period b in FIGS. 17A and 17B).

The monitored over a relatively long time an input video signal, the predictive control flag generation unit 45, when the occurrence frequency count value tc is enabled count value TH ₂ or more, and determined to be a telecine video signal, prediction The control flag tciflg is set to “1” (period c in FIGS. 17A and 17B). While the prediction control flag tciflg is “1”, the prediction control means 16 selects the telecine sequence detection signal tci ₀ by the sequence detection means 14 and outputs it as a telecine detection signal tci indicating the detection of the telecine video signal. The activation of the process is controlled.

When the video signal is switched from a telecine video signal to a normal television broadcast or the like (in the case of period d in FIG. 17A), the cancellation signal generation unit 34 detects the telecine sequence by the sequence detection unit 14. The signal tci ₀ is released (tci ₀ = 0), and the telecine detection signal tci is also released (tci = 0). Furthermore, also in the appearance frequency detection means 15, the telecine sequence condition in the phase of the fifth field (that is, the position where the telecine sequence phase count value seq is “0” and the position of the still image once every five fields). Is not detected (step S204 in FIG. 16), the predetermined value Su is subtracted from the appearance frequency count value tc (ie, tc ← tc−Su) (steps S205 and S207 in FIG. 16). When the occurrence frequency count value tc is Ku becomes smaller than the effective count value TH _2, determines that not like telecine video signal, the predictive control flag Tciflg does not generate, Tciflg becomes '0'. Therefore, in the prediction control means 16, when the prediction control flag tciflg is “0”, the telecine detection signal tci becomes “0”, the telecine sequence detection signal tci ₀ temporarily satisfies the conditions of the normal telecine sequence, and the telecine Even if the sequence detection signal tci ₀ is “1”, the telecine processing is not activated.

  Next, the telecine video signal is edited, and edit points as shown in FIGS. 12A to 12K and FIGS. 14A to 14I exist in the middle of the video signal, and the telecine sequence is discontinuous. The operation of the appearance frequency detection means 15 when a video signal that frequently occurs is input from the input terminal 100 will be described.

The appearance frequency counter 40 in the appearance frequency detection means 15 detects a telecine sequence condition in which the still image detection result stl ₁ is “1” (still image) and the moving image continuous number mvf is “4”. In this case (step S201 in FIG. 16), the value Ad is added to the appearance frequency count value tc (that is, tc ← tc + Ad) (step S203 in FIG. 16). On the other hand, if the telecine sequence condition is not detected and the phase of the fifth field, that is, the telecine sequence phase count value seq becomes '0' (step S204 in FIG. 16), the still image continuous detection means 41 continues the five fields. When a still image is detected, addition / subtraction is not performed (that is, tc ← tc ± 0) (steps S205 and S206 in FIG. 16). This is because it cannot be determined whether or not the telecine sequence is in a continuous state of still images. If the still image is not detected continuously for 5 fields, it is determined that the telecine sequence is not detected, and a predetermined value Su is subtracted from the appearance frequency count value tc (ie, tc ← tc−Su) (step S207 in FIG. 16). . When the telecine sequence phase count value seq is '0' and a still image is detected (still image detection result stl ₁ = 1), addition / subtraction can be prevented (step S205 in FIG. 16). S206). At this time, the still image detection result stl ₁ = 0 (moving image) is obtained at the position of the still image once in five fields (the telecine sequence phase count value seq is “0” and the still image detection result stl ₁ = 0. ), The telecine sequence is not determined, and the predetermined value Su is subtracted from the appearance frequency count value tc (step S207).

In predictive control flag generation unit 45 compares the occurrence frequency count value tc and the effective count value TH _2, determines certainty of being the telecine video signal (step S208 in FIG. 16) is, the editing point is in frequent , the discontinuity of the sequence occurs, since the conditions for telecine sequence is not detected, there is no possibility that the occurrence frequency count value tc reaches a valid count value TH _2. Accordingly, it is determined that the video signal is not a telecine video signal, the prediction control flag tciflg is not generated, and tciflg remains “0” (step S209 in FIG. 16).

  FIGS. 18A and 18B are diagrams for explaining the operation at the time of inputting a telecine video signal where edit points frequently exist in the appearance frequency detecting means 15, and FIG. 18A shows the appearance frequency counter. An output value (appearance frequency count value) tc from 40 and (b) in the figure show the prediction control flag tciflg generated by the prediction control flag generation means 45. 18A and 18B, when the discontinuity of the telecine sequence frequently occurs, the frequency of detecting the telecine sequence condition is low every five fields, and the appearance frequency count value is detected by detecting the telecine sequence condition. The frequency of subtracting the appearance frequency count value tc (that is, tc ← tc−Su) is higher than the frequency of adding tc (that is, tc ← tc + Ad). If the appearance frequency count value tc is a negative value, the count value is clipped to 0.

Therefore, when the input video signal is monitored over a relatively long time, the occurrence frequency count value tc does not reach the effective count value TH _{2 in} the predictive control flag generation unit 45 and is not likely to be a telecine video signal (that is, a telecine video signal). The prediction control flag tciflg is set to “0”. When the prediction control flag tciflg is “0”, the prediction control unit 16 does not select the telecine sequence detection signal tci ₀ by the sequence detection unit 14 but selects and outputs the fixed value “0” as the selection signal tci.

  Then, a telecine detection signal tci indicating the detection of the telecine video signal controlled by the prediction control means 16 is sent to the selection means 8 as a control signal. When the prediction control means 16 determines that the video signal is not likely to be a telecine video signal (that is, the possibility of being a telecine video signal is low), the telecine detection signal tci is output as '0', so the selection means in FIG. 8 selects the signal Im from the motion adaptive interpolation processing means 5 as a normal video signal that is not a telecine video signal.

As described above, according to the video signal processing apparatus or the video signal processing method of the first embodiment, it is detected whether or not the sequentially input interlace video signal Ia satisfies the repetition condition of the 5-field telecine sequence. The frequency of appearance of the field sequence satisfying the telecine sequence repetition condition is measured, and a telecine detection signal tci indicating whether the video signal has been telecine converted based on these results tci ₀ and tciflg is output. I have to. As described above, the video signal Ia is a result of monitoring over a relatively long period (field) in addition to the detection result tci ₀ of whether or not the repetition condition of the telecine sequence is satisfied. Since the telecine detection signal tci based on the appearance frequency flag tciflg of the field sequence having the meaning as an index indicating the certainty is output, the reliability of the telecine detection signal tci is improved. Therefore, according to the video signal processing apparatus or the video signal processing method of the first embodiment, the interpolation scanning line signal Im or It selected based on the telecine detection signal tci is appropriately selected by improving the reliability of the telecine detection signal tci. (For example, it is determined that the video signal is not a telecine video signal because there are frequent edit points and the discontinuity of the telecine sequence frequently occurs, and the telecine detection signal tci is not a telecine video signal ( tci = 0), for example, even if the telecine sequence condition is temporarily satisfied, it can be controlled not to perform telecine interpolation.) For this reason, the frequency of image quality degradation due to combing phenomenon, which may occur when a signal other than a telecine-converted video signal is mixed in the middle of a telecine-converted video signal, reduces the frequency of image quality degradation due to a combing phenomenon, Can be converted into a good progressive video signal Prog.

  In the above description, the cumulative counter 13 in the predetermined area in the correlation detecting unit 120 calculates the number of moving pixels in a predetermined area of one field, and the sequence detecting unit 14 compares the number of moving pixels with a predetermined threshold value, thereby Field detection and scene change detection are performed. However, the present invention is not limited to such an embodiment. The predetermined area cumulative counter 13 determines the number of still pixels in one field in a predetermined area, and the sequence detection means 14 determines the number of still pixels. Other modes that can determine the strength of the correlation with the field one frame before may be employed, such as detection of a still image field and detection of a scene change by comparing with a threshold value.

  In the above description, the difference detection means 11 in the telecine detection means 6 detects the difference information between one frame. However, the present invention is not limited to such an aspect. The telecine video signal may be detected using the 1-frame difference information in the motion detection means 4 that obtains the difference information between the field signal Ia and the 2-field delay signal Ic.

  Further, in the above description, a mode has been described in which the difference detection unit 11 in the telecine detection unit 6 calculates the absolute value of the difference between one frame and outputs it as difference information. However, the present invention is not limited to such an embodiment, and nonlinear conversion such as multiplying the absolute value of the difference by a predetermined value and subtracting the predetermined value is performed. Information may be used, and other modes may be adopted as long as the strength of the correlation between the frames can be detected from the obtained 1-frame difference information and whether the field is a still image field or a moving image field. Good.

Furthermore, in the above description, and repeatedly counts from "0" for each telecine sequence phase counter 23 5 fields in the sequence detecting unit 14 to '4', a still image detection result stl ₁ is '1' ( The mode of resetting to zero when the number of continuous video mvf is “4” has been described, but the repetition value and the reset value are not limited to this. The present invention is a signal repeated every 5 fields, when the still image detection result stl ₁ is “1” (still image) and the moving image continuous number mvf is “4”, that is, every 5 fields. Any mode can be applied as long as it is synchronized with a still image field once and is reset to a predetermined value.

  In the above description, motion adaptive interpolation processing is performed in IP conversion for a normal video signal. However, the present invention is not limited to such an embodiment, and is based only on intra-field interpolation processing. Other modes such as a mode using an interpolation signal may be used.

  Further, in the above description, each configuration of the video signal processing apparatus is described as being a hardware configuration, but the present invention may be configured to be realized by software processing in program control.

Embodiment 2. FIG.
In the first embodiment, the video signal processing apparatus and the video signal processing method for detecting whether or not the input video signal is a telecine video signal and performing IP conversion based on the detection result have been described. Can be applied to a video signal display device that converts an interlaced video signal as an input video signal into a progressive video signal and converts it into a high-quality image. In the second embodiment, an interlaced video signal input from a TV broadcast signal or a recording / playback device such as a DVD or VTR is processed, and the progressive video signal is processed by the video signal processing device or the video signal processing method of the first embodiment. A video signal display apparatus that performs IP conversion and displays video based on the converted progressive video signal will be described.

  FIG. 19 is a block diagram showing a configuration of a video signal display apparatus according to Embodiment 2 of the present invention. In FIG. 2, the same reference numerals are given to the same or corresponding components as those in FIG. As shown in FIG. 19, the video signal display device according to the second embodiment has an input terminal 200, an input signal processing means 201, in addition to the configuration of the video signal processing device according to the first embodiment (see FIG. 1). The display processing unit 202 and the display unit 203 are provided to display the progressive video signal Prog after the IP conversion. Configurations and operations other than those relating to the input terminal 200, the input signal processing means 201, the display processing means 202, and the display means 203 are the same as those described in the first embodiment.

  The input terminal 200 receives a TV broadcast signal or a signal from a recording / reproducing device such as a DVD or VTR. A signal input to the input terminal 200 is sent to the input signal processing means 201. Here, a TV broadcast signal, a signal transmitted from a DVD, a VTR, or the like is a standard television signal such as an NTSC system signal or a high-definition signal, and is an interlace video signal.

  The input signal processing unit 201 performs input signal processing such as conversion from an analog signal to a digital signal and separation of a synchronization signal on a TV broadcast signal or a signal from a recording / playback device such as a DVD or VTR. The output of the input signal processing unit 201 is input as an interlaced video signal Ia to the timing signal generation unit 1, the 1-field delay unit 2, the interpolation signal generation unit 110, and the telecine detection unit 6.

  The double speed conversion means 9 outputs the progressive video signal Prog to the display processing means 202.

  The progressive processing video signal Prog subjected to IP conversion from the double speed conversion means 9 is input to the display processing means 202. The display processing unit 202 performs signal processing for converting the progressive video signal Prog into a display signal such as scaling processing and outputs the display signal to the display unit 203 as a display signal for display as a progressive video.

  The display unit 203 displays a video based on the display signal from the display processing unit 202 as a progressive video.

  As described above, according to the video signal display device of the second embodiment, since the video signal processing device or the video signal processing method of the first embodiment is used, the image quality deterioration due to the combing phenomenon is reduced. It is possible to display a high-quality video based on the progressive video signal.

It is a block diagram which shows the structure of the video signal processing apparatus by Embodiment 1 of this invention. 3 is a block diagram showing a configuration of sequence detection means in the video signal processing apparatus according to Embodiment 1. FIG. It is a figure which shows the relationship (in the case of a telecine video signal) with the moving pixel cumulative value output from the predetermined area accumulation counter in the correlation detection means in the video signal processing apparatus by Embodiment 1, and a field number. It is a figure which shows the relationship (when there exists a scene change) between the moving pixel accumulated value output from the accumulation counter in the predetermined area in the correlation detection means in the video signal processing apparatus by Embodiment 1, and a field number. 3 is a block diagram showing a configuration of appearance frequency detection means in the video signal processing apparatus according to Embodiment 1. FIG. FIG. 3 is a block diagram illustrating a configuration of a prediction control unit in the video signal processing device according to the first embodiment. 6 is a flowchart for explaining the operation of the sequence detecting means in the video signal processing apparatus according to the first embodiment. (A) thru | or (c) is a figure which shows the telecine conversion of 2-3 pulldown system, (a) is a film image of 24 frames / second, (b) is a telecine image teleconverted by 2-3 pulldown system. Signal (c) indicates a field number. (A) thru | or (d) is a figure for demonstrating the relationship between the telecine interpolation at the time of detecting a telecine video signal and carrying out IP conversion, (a) is a field number, (b) is a telecine video. The signal is an interlaced video signal, (c) is an interpolation phase, and (d) is a progressive video signal. (A) thru | or (g) is a figure for demonstrating operation | movement of the sequence detection means in the video signal processing apparatus by Embodiment 1, (a) is a field number, (b) is the interlace video which is a telecine video signal. (C) is the output of the first still image detection means, (d) is the output of the moving picture field counter, (e) is the output of the telecine sequence phase counter, (f) is the output of the telecine activation counter, (g) Indicates the output of the sequence detection signal generating means. (A) thru | or (e) is a figure for demonstrating the operation | movement of the interpolation phase and telecine interpolation in the sequence detection means in the video signal processor by Embodiment 1, (a) is a field number, (b) is a telecine. The output of the sequence phase counter, (c) shows an interpolation phase flag, (d) shows a one-field delay signal, and (e) shows a progressive video signal after interpolation. (A) thru | or (k) is a figure for demonstrating operation | movement of the sequence shift | offset | difference detection means in the video signal processing apparatus by Embodiment 1, (a) is a field number, (b) is the interlace which is a telecine video signal. (C) is the output of the first still image detection means, (d) is the output of the moving picture field counter, (e) is the output of the telecine sequence phase counter, (f) is the interpolation phase flag, (g) is The output of the third still image detecting means, (h) the output of the in-sequence still image counter, (i) the output of the comparing means in the sequence deviation detecting means, (j) the output of the telecine activation counter, (k) Indicates the output of the sequence detection signal generating means. (A) thru | or (f) is a figure for demonstrating the relationship of a telecine detection signal and a telecine interpolation in case there exists a shift | offset | difference of a sequence phase in the video signal processing apparatus by Embodiment 1, (a) is a field number. (B) is the output of the telecine sequence phase counter, (c) is the interpolation phase flag, (d) is the telecine detection signal output from the telecine detection means, (e) is the one-field delay signal, and (f) is after interpolation The progressive video signal is shown. (A) thru | or (i) is a figure for demonstrating operation | movement of the scene change detection means of the video signal processing apparatus by Embodiment 1, (a) is a field number, (b) is the interlace which is a telecine video signal. (C) is the output of the first still image detection means, (d) is the output of the moving picture field counter, (e) is the output of the telecine sequence phase counter, (f) is the interpolation phase flag, (g) is The output of the scene change detection means, (h) shows the output of the telecine activation counter, and (i) shows the output of the sequence detection signal generation means. (A) thru | or (f) is a figure for demonstrating the relationship between a telecine detection signal and a telecine interpolation, when a scene change is detected in the video signal processing apparatus by Embodiment 1, (a) is a field number. (B) is the output of the telecine sequence phase counter, (c) is the interpolation phase flag, (d) is the telecine detection signal output from the telecine detection means, (e) is the one-field delay signal, and (f) is after interpolation The progressive signal is shown. 6 is a flowchart for explaining the operation of appearance frequency detection means in the video signal processing apparatus according to Embodiment 1; (A) And (b) is a figure for demonstrating the operation | movement at the time of telecine video signal input of the appearance frequency detection means in the video signal processing apparatus by Embodiment 1, (a) is an output value from an appearance frequency counter. (B) shows the prediction control flag output from the prediction control flag generation means. (A) And (b) is a figure for demonstrating the operation | movement at the time of the telecine video signal input in which the edit point exists frequently in the appearance frequency detection means in the video signal processing apparatus by Embodiment 1, (a) Is an output value from the appearance frequency counter, and (b) is a prediction control flag output from the prediction control flag generating means. It is a block diagram which shows the structure of the video signal display apparatus by Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Timing signal generation means 2,3 1 field delay means 4 Motion detection means 5 Motion adaptive interpolation processing means 6 Telecine detection means 7 Telecine interpolation processing means 8 Selection means 9 Double speed conversion means 11 Difference detection means , 12 Comparison means, 13 Accumulation counter in predetermined area, 14 Sequence detection means, 15 Appearance frequency detection means, 16 Prediction control means, 21a, 21b, 21c Still picture detection means, 22 Movie field counter, 23 Telecine sequence phase counter, 24 Telecine activation counter, 25 moving image continuous detection means, 27 still image continuous detection means, 28 comparison means, 29 sequence deviation detection means, 30 still image counter in sequence, 31 comparison means, 32 scene change detection means, 33 comparison threshold setting means, 34 release signal generating means, 35 Interpolation phase flag generation means, 36 sequence detection signal generation means, 37 start count value setting means, 40 appearance frequency counter, 41 still image continuous detection means, 42 count value adjustment means, 43 maximum value setting means, 44 count value initialization means 45 Predictive control flag generating means 46 Effective count value setting means 50 Switching means 100 Input input terminal 101 Output terminal 110 Interpolation signal generating means 120 Correlation detecting means 141 Sequence phase detecting means 142 Telecine sequence determination Means, 143 telecine release detection means, 151 sequence determination frequency detection means, 152 probability determination means, 201 input signal processing means, 202 display processing means, 203 display means, cnt moving picture element accumulated value, detm motion detection signal, Ia current field Signal (I Terlace video signal, input video signal), Ib, R 1 field delay signal, Ic 2 field delay signal, Im interpolation scanning line signal, It interpolation signal (telecine interpolation signal), I selected interpolation scanning line signal, mvf video field Counter output, oncnt telecine start counter output, Prog progressive video signal, seq telecine sequence phase counter output, stl ₁ , stl ₂ , stl ₃ still image detection signal, tci telecine detection signal, tci ₀ telecine sequence detection signal, tciflg prediction control flag Te area signal.

The video signal processing device of the present invention is a video signal processing device for converting interlaced scanning video signals into progressive scanning video signals, field delay means for delaying the interlaced scanning video signals in units of fields, and the interlaced scanning video signals. A correlation detecting means for detecting a correlation between the field of interest and a field one frame before the field of interest and outputting a signal indicating the strength of the correlation between frames based on the detection result; Based on the signal indicating the strength of the correlation, it is determined whether the interlaced scanning video signal satisfies the condition of the field sequence of the video signal subjected to telecine conversion, and a telecine sequence detection signal is generated based on the determination result. Based on the output sequence detection means and the signal indicating the strength of the correlation between the frames, the telecine change is performed. Has been measured frequency satisfies the condition field sequence of field sequence of the video signal, the frequency detecting means for outputting a predictive control signal based on the measurement results, the telecine sequence detection signal is controlled by the predictive control signal A plurality of types of interpolation signals are generated based on the prediction control means for outputting a telecine detection signal as a controlled result, and the interlaced scanning video signal and the video signal delayed by the field delay means, and the telecine detection signal Based on the interpolated scanning video signal and the interpolated signal output from the interpolated signal generating means, the interpolated scanning video signal and the interpolated signal output from the interpolated signal generating means. Conversion means for generating a signal.

The video signal processing method of the present invention is a video signal processing method for converting an interlaced video signal into a progressive video signal, the step of delaying the interlaced video signal in units of fields, and the interlaced video signal Detecting a correlation between the field of interest and a field one frame before the field of interest, and outputting a signal indicating the strength of the correlation between the frames, and a signal indicating the strength of the correlation between the frames And determining whether or not the interlaced scanning video signal satisfies the condition of the field sequence of the telecine-converted video signal, generating and outputting a telecine sequence detection signal based on the determination result, and the frame A field sequence of the telecine-converted video signal based on a signal indicating the strength of the correlation between Measures the frequency of satisfying field sequence, and outputting a predictive control signal based on the measurement results, the telecine sequence detection signal is controlled by the predictive control signal, a telecine detection signal that is a controlled results A step of outputting and a step of selecting and outputting one of a plurality of types of interpolated scanning line signals generated based on the interlaced scanning video signal and the delayed interlaced scanning video signal based on the telecine detection signal And generating the progressive scanning video signal based on the interlaced scanning video signal and the selected interpolated scanning line signal.

The telecine sequence determination unit 142 includes a field still image detection result stl ₁ from the first still image detection unit 21 a, a moving image continuous number mvf from the moving image field counter 22 to the previous field, and a telecine release detection unit 143. The release signal rst is input. The telecine sequence determination unit 142 detects a telecine sequence repetition condition, determines whether the telecine sequence is a telecine sequence, and outputs a telecine sequence detection signal tci ₀ indicating the sequence detection result. Below, each block which comprises the telecine sequence determination means 142 is demonstrated.

This is because, when the still image detection result stl ₁ = 1 (still image) at the position of a still image once in 5 fields, the moving image continuous number mvf = “4”, which is one of the above sequence conditions, This is because there is a case where the telecine sequence is in progress (eg, switching from a still image to a moving image in the telecine sequence), and there is a case where it cannot be determined whether or not the telecine sequence is present. By not determining the telecine sequence only when the still image detection result stl ₁ = 0 (moving image) at the position of the still image once in 5 fields, the above condition is removed from the subtraction target, and the count value It is also possible not to add or subtract tc.

As described above, according to the video signal processing apparatus or the video signal processing method of the first embodiment, it is detected whether or not the sequentially input interlace video signal Ia satisfies the repetition condition of the 5-field telecine sequence. The frequency of appearance of the field sequence satisfying the telecine sequence repetition condition is measured, and a telecine detection signal tci indicating whether the video signal has been telecine converted based on these results tci ₀ and tciflg is output. I have to. As described above, the video signal Ia is a result of monitoring over a relatively long period (field) in addition to the detection result tci ₀ of whether or not the repetition condition of the telecine sequence is satisfied. Since the telecine detection signal tci based on the appearance frequency flag tciflg of the field sequence having the meaning as an index indicating the certainty is output, the reliability of the telecine detection signal tci is improved. Therefore, according to the video signal processing apparatus or the video signal processing method of the first embodiment, the interpolation scanning line signal Im or It selected based on the telecine detection signal tci is appropriately selected by improving the reliability of the telecine detection signal tci. may be selected (e.g., frequently there is an edit point, the discontinuous telecine sequence is not a telecine video signal telecine detection signal tci it is determined that not like telecine video signal to frequent video signal (Tci = 0), for example, even if the telecine sequence condition is temporarily satisfied, it can be controlled not to perform telecine interpolation.) For this reason, the frequency of image quality degradation due to combing phenomenon, which may occur when a signal other than a telecine-converted video signal is mixed in the middle of a telecine-converted video signal, reduces the frequency of image quality degradation due to a combing phenomenon, Can be converted into a good progressive video signal Prog.

FIG. 19 is a block diagram showing a configuration of a video signal display apparatus according to Embodiment 2 of the present invention. In FIG. 19 , the same reference numerals are given to the same or corresponding components as those in FIG. As shown in FIG. 19, the video signal display device according to the second embodiment has an input terminal 200, an input signal processing means 201, in addition to the configuration of the video signal processing device according to the first embodiment (see FIG. 1). The display processing unit 202 and the display unit 203 are provided to display the progressive video signal Prog after the IP conversion. Configurations and operations other than those relating to the input terminal 200, the input signal processing means 201, the display processing means 202, and the display means 203 are the same as those described in the first embodiment.

The video signal processing apparatus according to the present invention is a video signal processing apparatus that converts interpolated scanning lines from interlaced scanning video signals to sequential scanning video signals, field delay means for delaying the interlaced scanning video signals in units of fields, and Correlation detecting means for detecting a correlation between a target field of the interlaced scanning video signal and a field one frame before the target field and outputting a signal indicating the strength of correlation between frames based on the detection result; a signal indicating the intensity of the correlation between frames, the interlaced scanning video signal is judged whether or not the condition field sequence telecine converted video signal, from the determination result, in the interlaced scan video signal, telecine Telecine sequence detection indicating whether or not a field sequence has been detected in the video signal No. and a sequence detecting means for outputting a interpolation phase time indicating the direction of the telecine converted fields from the same frame, a signal indicating the intensity of the correlation between the frames, the conditions of the field sequence of the telecine converted video signal The appearance frequency of the field sequence satisfying the above is measured, and when the count value indicating the measured appearance frequency is equal to or greater than a predetermined effective count value, it is determined that the interlaced scanning video signal is a video signal subjected to telecine conversion, and the appearance frequency An appearance frequency detecting means for outputting a predictive control signal indicating a result determined not to be a telecine video signal when the count value indicating less than the effective count value, and the predictive control signal is telecine-converted from the interlaced scan video signal To indicate that it is a video signal, use the telecine When the telecine sequence detection signal output from the motion detection means is selected and output, and the prediction control signal indicates that the interlaced video signal is not likely to be a telecine video signal, the field sequence in the telecine video signal is A prediction control means for selecting a signal indicating that the signal is not detected and outputting it as a telecine detection signal; generating a first interpolation signal from the interlaced scanning video signal and the video signal delayed by the field delay means; The telecine detection signal output from the prediction control means by generating a second interpolation signal from the signal of the field positioned before or after the target field of the interlaced scanning video signal according to the time direction of the field indicated by Is output from the telecine sequence detecting means. The second interpolation signal is output when it is a nesequence detection signal, and the first interpolation signal is output when the telecine detection signal output from the prediction control means is a signal indicating that a field sequence in the telecine video signal is not detected. Interpolation signal generation means for outputting the interpolated signal, and conversion means for switching the interlaced scanning video signal and the interpolation signal output from the interpolation signal generating means to generate the video signal by sequentially scanning. .

The video signal processing method of the present invention is a video signal processing method for converting interlaced scanning video signals into sequentially scanned video signals, the step of delaying the interlaced scanning video signals in units of fields, and the interlaced scanning video and the field of interest of the signal, detects a correlation between one frame previous field from the field of interest, and outputting a signal indicative of the strength of the correlation between frames, a signal indicating the intensity of the correlation between the frame the interlaced scanned video signal, it is determined whether or not the condition field sequence telecine converted video signal, whether the result of the judgment, in the interlaced scan video signal, or a field sequence in the telecine video signal is detected Telecine conversion signal from the same frame as the telecine sequence detection signal indicating And outputting the interpolation phase time indicating the direction of the field, the signal that indicates the intensity of the correlation between the frames, to measure the frequency of satisfying field sequence of field sequence of the telecine converted video signal, this When the count value indicating the measured appearance frequency is equal to or greater than a predetermined effective count value, the interlaced scanning video signal is determined to be a telecine-converted video signal, and when the count value indicating the appearance frequency is less than the effective count value. A step of outputting a prediction control signal indicating a result of determining that the video signal is not likely to be a telecine video signal, and when the prediction control signal indicates that the interlaced video signal is determined to be a video signal obtained by telecine conversion; The sequence detection signal is selected and output, and the prediction control signal is skipped. When it indicates that a scanned video signal is determined to not like telecine video signal, and outputting as a telecine detection signal by selecting the signal indicating that the field sequence in the telecine video signal is not detected, the interlaced scanned video signal And a first interpolation signal is generated from the field-delayed video signal, and a second interpolation signal is generated from a signal in a field positioned before or after the target field of the interlaced scanning video signal according to the time direction of the field indicated by the interpolation phase. When the telecine detection signal selected and output is the telecine sequence detection signal output from the telecine sequence detection means, the second interpolation signal is output and the selection is performed. The telecine detection signal output by the When the signal indicates that the field sequence in the signal is not detected, the step of outputting the first interpolation signal and the interlaced scanning video signal and the selected interpolation signal are switched to generate the sequential scanning video signal. Steps.

Claims (17)

A video signal processing device for converting interlaced scanning video signals into sequential scanning video signals,
Field delay means for delaying the interlaced scanning video signal in field units;
Correlation detecting means for detecting a correlation between a target field of the interlaced scanning video signal and a field one frame before the target field, and outputting a signal indicating the strength of correlation between frames based on the detection result; ,
Based on the signal indicating the strength of the correlation between the frames, it is determined whether the interlaced scanning video signal satisfies the conditions of the field sequence of the video signal subjected to telecine conversion, and the telecine sequence detection signal based on the determination result A sequence detecting means for generating and outputting
Based on the signal indicating the strength of the correlation between the frames, the appearance frequency of the field sequence satisfying the condition of the field sequence of the video signal subjected to the telecine conversion is measured, and the prediction control signal is output based on the measurement result A frequency detection means;
Prediction control means for outputting a telecine detection signal based on the telecine sequence detection signal and the prediction control signal;
A plurality of types of interpolation signals are generated based on the interlaced scanning video signal and the video signal delayed by the field delay means, and one of the plurality of types of interpolation signals is selected and output based on the telecine detection signal. Interpolation signal generating means for
A video signal processing apparatus comprising: conversion means for generating the progressive scanning video signal based on the interlaced scanning video signal and the interpolation signal output from the interpolation signal generating means.   The signal indicating the strength of correlation between the frames output from the correlation detection means is a pixel in a predetermined region or all regions in the target field of the interlaced scanning video signal, and one frame before the target field. 2. The video signal processing according to claim 1, wherein the video signal processing is a signal corresponding to a cumulative value of the number of pixels in which a difference value between pixels at the same position in the field is equal to or greater than a predetermined difference value determination threshold value. apparatus.   The sequence detecting means determines whether or not the condition of the field sequence of the video signal telecine-converted by the 2-3 pull-down method is satisfied based on a signal indicating the strength of correlation between the frames for five fields. 3. The video signal processing apparatus according to claim 1, wherein a value corresponding to a determination result is output as the telecine sequence detection signal. The sequence detection means includes
Still image detection for comparing the signal indicating the strength of correlation between the frames with a predetermined correlation determination threshold and detecting whether the field of interest is a still image field or a moving image field based on the comparison result Means,
Based on the detection result of the still image detecting means, a moving picture field counting means for detecting a continuous number of fields indicating a moving picture field;
Based on the detection result of the still image detection means and the detection result of the moving image field count means, a sequence phase detection means for detecting the phase of the field sequence of the telecine-converted video signal and outputting the phase as an interpolation phase. The video signal processing apparatus according to claim 3, further comprising: The sequence detection means includes
Based on the detection result of the still image detection unit, the detection result of the moving image field counting unit, and a signal indicating the strength of correlation between the frames, the interlaced scanning video signal is telecine-converted in the field sequence of the video signal. Telecine cancellation detecting means for detecting a case where the condition is not satisfied,
Telecine sequence determination means for generating and outputting the telecine sequence detection signal based on the detection result of the still image detection means, the detection result of the moving picture field count means, and the detection result of the telecine release detection means. The video signal processing apparatus according to claim 4. The sequence phase detection means includes
Based on the detection result of the still image detecting means and the detection result of the moving picture field counting means, after the moving picture field continues for four fields, the repeated signal is repeated at a period of five fields in synchronization with the timing of the field to become the still picture field. Telecine sequence phase counting means for generating
6. Interpolation phase flag generation means for generating and outputting the interpolation phase indicating the conversion phase of the 2-3 pull-down telecine conversion based on the repetitive signal. The video signal processing apparatus described. The telecine release detecting means is
Based on the detection result of the still image detecting means and the detection result of the moving picture field counting means, a moving picture continuous detecting means for detecting a case where a moving picture field continues for a predetermined field or more,
Based on the detection result of the still image detection means, still image continuous detection means for detecting the number of consecutive fields indicating still image fields in the interlaced scanning video signal;
Continuous field number comparison means for detecting a case where the number of continuous still image fields detected by the still image continuous detection means continues for a predetermined field or more;
Based on the detection result of the still image detecting means, the repetitive signal output from the telecine sequence phase counting means, and the telecine sequence detection signal, the phase shift of the still image field in the sequence in the interlaced scanning video signal is detected. Sequence deviation detecting means for
Scene change detection means for detecting a field where a scene change has occurred in the interlaced scanning video signal based on a signal indicating the strength of correlation between the frames;
Based on at least one of the detection result of the moving image continuous detection means, the detection result of the continuous field number comparison means, the detection result of the sequence deviation detection means, and the detection result of the scene change detection means. Determining that the interlaced scanning video signal does not satisfy the field sequence condition of the telecine-converted video signal, and determining the telecine sequence detection signal as the field sequence condition of the video signal from which the interlaced scanning video signal is telecine-converted. 6. The video signal processing apparatus according to claim 5, further comprising: a cancellation signal generation unit that outputs a cancellation signal for causing the value to indicate that the condition is not satisfied. The sequence deviation detecting means is
Based on the detection result of the still image detecting means, the repetitive signal output from the telecine sequence phase counting means, and the telecine sequence detection signal based on the telecine-converted video signal field sequence at a predetermined field position In-sequence still image counting means for counting the number of still image fields detected by the still image detection means;
Comparing the count value output from the still image counting means in the sequence with a predetermined threshold value, and still picture field number comparing means for outputting the phase shift of the still picture field based on the comparison result, The video signal processing apparatus according to claim 7.   The scene change detection means compares the value indicated by the signal indicating the correlation strength between the frames with a predetermined threshold value related to the correlation, and the value indicated by the signal indicating the correlation strength between the frames is a predetermined value related to the correlation. 8. The video signal processing apparatus according to claim 7, wherein a field in which a scene change has occurred in the interlaced scanning video signal is detected when it is determined that the threshold value is smaller than the threshold value. The telecine sequence determination means is
Based on the detection result of the still image detecting means, the detection result of the moving picture field counting means, and the detection result of the telecine release detecting means, the number of consecutive field sequences that become still picture fields after four moving picture fields continue A telecine activation counter that resets the count value of the continuous number of the field sequence based on a release signal from the telecine release detection means,
A sequence detection signal generating means for comparing the count value of the continuous number of the field sequence by the telecine activation counter with a predetermined threshold relating to the continuous number of the field sequence, and outputting the comparison result as the telecine sequence detection signal. 8. The video signal processing apparatus according to claim 7, wherein The appearance frequency detecting means is
When the field sequence condition of the telecine-converted video signal is satisfied based on the detection result of the still image detection unit, the detection result of the moving image field counting unit, and the repetitive signal output from the telecine sequence phase counting unit Sequence determination number detection means for counting the number of times detected,
The count value of the number of times when the condition of the field sequence of the video signal subjected to telecine conversion by the sequence determination number detection unit is satisfied is compared with a predetermined threshold value for detecting the number of sequence determinations, and the comparison result is telecine-converted. The video signal processing apparatus according to claim 6, further comprising: a probability determination unit that outputs the prediction control signal as an index indicating the likelihood of being a video signal. The sequence determination number detection means includes:
Still image continuous detection means for detecting when the output from the still image detection means continuously becomes a still image field every five fields, based on the repetitive signal output from the telecine sequence phase counting means;
Based on the detection result of the still image detecting means, the detection result of the moving picture field counting means, the repetitive signal output from the telecine sequence phase counting means, and the detection result of the still continuous image detecting means, a predetermined added value And an appearance frequency counting means for performing addition and subtraction using the subtraction value. The appearance frequency counting means is
Count value adjusting means for setting each value of the addition value and the subtraction value;
Maximum value setting means for setting the maximum value of the count value in the appearance frequency counting means;
11. The video signal processing apparatus according to claim 10, further comprising: a count value initializing unit that initializes a count in the appearance frequency counting unit and sets a predetermined initial value. The prediction control means includes
Determining whether the appearance frequency of the field sequence is equal to or higher than a predetermined effective count value based on the prediction control signal;
When the appearance frequency of the field sequence is greater than or equal to the effective count value, the telecine sequence detection signal is output as the telecine detection signal,
The video signal processing apparatus according to any one of claims 1 to 13, wherein when the appearance frequency of the field sequence is less than the effective count value, a predetermined fixed value is output as the telecine detection signal. The interpolation signal generating means includes
Motion adaptive interpolation processing means for generating and outputting a first interpolation signal used for motion adaptive interpolation processing;
Telecine interpolation processing means for generating and outputting a second interpolation signal used for interpolation processing on the telecine-converted video signal;
2. Selection means for selecting and outputting either the first interpolation signal or the second interpolation signal based on a telecine detection signal output from the prediction control means. 15. The video signal processing device according to any one of items 14 to 14. A video signal processing method for converting interlaced scanning video signals into sequential scanning video signals,
Delaying the interlaced scanning video signal in field units;
Detecting a correlation between a field of interest of the interlaced scanning video signal and a field one frame before the field of interest, and outputting a signal indicating the strength of the correlation between frames;
Based on the signal indicating the strength of the correlation between the frames, it is determined whether the interlaced scanning video signal satisfies the conditions of the field sequence of the video signal subjected to telecine conversion, and the telecine sequence detection signal based on the determination result Generating and outputting
A step of measuring the appearance frequency of a field sequence satisfying the condition of the field sequence of the video signal subjected to telecine conversion based on the signal indicating the strength of correlation between the frames and outputting a prediction control signal based on the measurement result When,
Outputting a telecine detection signal based on the telecine sequence detection signal and the prediction control signal;
Selecting and outputting one of a plurality of types of interpolated scanning line signals generated based on the interlaced scanning video signal and the delayed interlaced scanning video signal based on the telecine detection signal;
Generating the progressive scanning video signal based on the interlaced scanning video signal and the selected interpolated scanning line signal. A video signal processing device according to any one of claims 1 to 15,
Display means for displaying video;
And a display processing circuit for displaying on the display means a video based on the progressive scanning video signal output from the video signal processing device.

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