JP2010213180A - Telecine video signal detector, video processor, method of detecting telecine video signal, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve detection delay in video signals, where telops run from screen ends to one part of telecine video. <P>SOLUTION: A differential relationship between a current field image (F(t)) and a field image (F(t-2)) two fields before is determined for each of a plurality of blocks BL into which a field is divided. Further, an input video signal for a peripheral block IV(*2) of a telop region IV(*1) that may include a telop not subjected to pull-down processing is predetermined as a non-telecine video signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for detecting that an input video signal is a telecine video signal generated by pull-down processing.

  In general, when a 24-frame progressive (sequential) video signal is converted to a 60-field interlace video signal, for example, telecine conversion called a 32-pull-down method is performed. According to this telecine conversion, a movie film of 24 frames per second can be converted into an interlace video signal (telecine video signal) having a speed of 60 fields per second.

  FIG. 16 is an explanatory diagram for explaining the 32 pull-down method. As shown in the figure, according to the 32 pull-down method, an interlaced video signal of 5 fields is formed from 2 frames of movie film. That is, from the first frame “A” of the movie film, an “Ao” field, an “Ae” field, and an “Ao” field of the television signal are generated, and the second frame of the movie film “ From “B”, a “Be” field and a “Bo” field of the television signal are generated.

  In the “A” frame, the “Ao” field is repeatedly inserted for speed adjustment. The subscript “o” indicates a field obtained by thinning out even-numbered scan lines (leaving odd-numbered scan lines) of a motion picture film frame, and the subscript “e” indicates a motion picture film frame. This is a field in which odd-numbered scan lines are thinned out (even-numbered scan lines are left). A telecine video signal is obtained by sequentially recording the fields Ao, Ae, Ao, Be, Bo converted in this way. Since this conversion is repeated thereafter, the telecine video signal converted by the 32 pull-down method has a periodicity of 5 fields.

  As described above, in the telecine video signal, the same field appears once every 5 fields. Conventionally, there has been proposed a telecine video signal device that detects a telecine video signal by accumulating the absolute value of the difference between one field skipped for each field using this periodicity (for example, Patent Document 1).

  Subtitles may be included in video input such as movies. The entire screen is subjected to telecine conversion by the 32 pull-down method, and is inserted so that a character telop such as subtitles flows over a plurality of frames. In such a case, a configuration has been proposed in which a character telop portion is detected as a non-telecine video signal by dividing the screen into a plurality of small regions and determining whether each small region is a caption region (patent) Reference 2).

JP 10-65964 A JP 2007-259314 A

  However, even in the conventional technology such as Patent Document 2, since the character telop moves so as to flow on the screen, a detection delay occurs and the character telop portion is detected with high accuracy as a non-telecine video signal. I couldn't.

  Such a problem is not limited to 32 pull-down processing, but is common to all types of pull-down processing.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to detect a telop portion with high accuracy as a non-telecine video signal.

  In order to solve at least a part of the above problems, the present invention can be realized as the following forms or application examples.

Application Example 1 A telecine video signal detection device that detects that an input video signal is a telecine video signal generated by pull-down processing, the first field image included in the input video signal, and the first field A field image capturing unit that captures a second field image that is a field two fields before the image; a block that can divide each field image into a plurality of blocks; and the first field image and the second field image Based on the determination result of the presence / absence of the difference for each block obtained by the inter-field difference determination unit and the difference determination unit for each block obtained by the inter-field difference determination unit. A video signal determination unit for determining whether the input video signal is a telecine video signal for each block; A telop area detection unit that detects, as a telop area, the block that may include a telop that has not been subjected to the pull-down process, based on a determination result of the presence or absence of a difference for each block obtained by the inter-frame difference determination unit; , Detecting a plurality of the blocks located around the telop area, and using the input video signal for a predetermined block of the detected plurality of blocks as a determination result for each block by the video signal determination unit A telecine video signal detection apparatus comprising: a telop periphery setting unit that determines that the video signal is a non-telecine video signal regardless.

  According to the telecine video signal detection device described in Application Example 1, the difference between the first field image and the second field image two fields before is detected for each block that can divide the field image into a plurality of blocks, Based on the detected difference for each block, it is determined whether or not each block is a telecine video signal. Therefore, in the case of a video signal in which content that has not been telecine-converted, such as telop, is inserted in one field image, it is possible to determine that only the block on which the content is superimposed is a non-telecine video signal. .

  Further, according to the telecine video signal detection device, the input video signal for a predetermined block among the peripheral blocks in the telop area is determined to be a non-telecine video signal. Since telops such as characters and figures move on the screen, there is a high possibility that telop will enter the next block in the next field, but it is detected by predetermining that it is a non-telecine video signal. Even if some delay occurs, it can be reliably detected that it is a non-telecine video signal. Therefore, it is possible to detect the telop portion with high accuracy when it is a non-telecine video signal.

[Application Example 2] The telecine video signal detection device according to Application Example 1, wherein the telop periphery setting unit selects all of the detected blocks as the predetermined block. A telecine video signal detection device.

  According to the telecine video signal detection device described in the application example 2, it can be determined in advance that it is a non-telecine video signal over the entire range around the telop area. Therefore, a block in which a telop may enter in the next field can be reliably determined as a non-telecine video signal.

Application Example 3 In the telecine video signal detection device according to Application Example 1, the inter-field difference determination unit determines whether the first mode has no difference and the second mode has a difference. It is configured to determine which of the three or more modes including at least the third mode that is difficult, and the telop area detection unit displays the result of the determination by the difference determination unit on a time axis. It is configured to detect as a telop area a block in which the determination result of five generations before is the first mode and the latest determination result is the second mode, and the telop peripheral setting unit Whether each of a plurality of blocks detected as being located in the periphery of the telop area satisfies the condition that both the determination result five generations ago and the latest determination result are in the first mode Judgment, the condition is satisfied and the determination block, with the arrangement to be selected as the predetermined block, the telecine video signal detector.

  According to the telecine video signal detection device described in Application Example 3, the accuracy of determination of the presence / absence of a difference can be increased by adding the third mode. Further, a predetermined telop area is defined as a telop area only when the latest determination result is surely a difference, and a non-telecine video signal is defined around the telop area only when the latest determination result is surely no difference. Block. A block in which the latest determination result is surely no difference is a block with a high possibility that the telop moves because the determination result by the video signal determination unit is a telecine video signal. For this reason, it is possible to improve the accuracy of detecting a telop area and the accuracy of detecting a block where the telop is likely to move. Therefore, according to the telecine video signal detection apparatus, it is possible to detect the telop portion with high accuracy as a non-telecine video signal.

[Application Example 4] The telecine video signal detection device according to any one of Application Examples 1 to 3, wherein the inter-field difference determination unit includes the same pixel between the first field image and the second field image. A pixel difference calculation unit that subtracts a position gradation value to obtain a pixel difference, and a pixel difference group for one field detected by the pixel difference calculation unit is divided into a plurality of blocks, and pixels included in each block Telecine video comprising: an intra-block pixel difference extraction unit that sequentially extracts a difference for each block; and a block-by-block difference determination unit that determines whether there is a difference for each block based on the extracted pixel difference for each block. Signal detection device.

  According to the telecine video signal detection device described in the application example 4, after obtaining the pixel difference between the first field image and the second field image, the pixel difference included in each block is extracted in order for each block. . Therefore, the difference between fields for each block can be easily detected.

Application Example 5 A telecine video signal detection device that detects that an input video signal is a telecine video signal generated by pull-down processing,
A field image capturing unit that captures a first field image included in the input video signal and a second field image that is a field two fields before the first field image;
Define a block that can divide each field image into a plurality of blocks, and determine whether there is a difference between blocks in the same position between the first field image and the second field image. And
A video signal determination unit that determines, for each block, whether or not the input video signal is a telecine video signal based on the determination result of the difference between blocks obtained by the inter-field difference determination unit;
A telop area detection unit that detects, as a telop area, the block that may include a telop that has not been subjected to the pull-down process, based on the determination result of the difference between blocks obtained by the inter-field difference determination unit When,
A border of a predetermined width is defined around the telop area, and the input video signal for a portion corresponding to the border is a non-telecine video signal regardless of the determination result for each block by the video signal determination unit. A telecine video signal detection device comprising: a telop periphery setting unit which is determined to be.

  According to the telecine video signal detection device described in Application Example 5, the input video signal for the border portion having a predetermined width defined around the telop area is determined to be a non-telecine video signal. Since telops such as characters and figures move on the screen, the border around the telop area is likely to enter the telop in the next field, but is determined in advance to be a non-telecine video signal. Thus, even if a detection delay occurs to some extent, it can be reliably detected that the signal is a non-telecine video signal. Therefore, it is possible to detect the telop portion with high accuracy when it is a non-telecine video signal.

Application Example 6 A video processing apparatus that processes video including a telecine video, the telecine video signal detection apparatus according to any one of application examples 1 to 5, and the telecine video signal detected by the telecine video signal detection apparatus. An image processing apparatus comprising: an IP conversion unit that performs IP conversion corresponding to the pull-down process on a signal portion determined to be present.

  In a conventional video processing apparatus, when IP conversion is performed when a telop that has not been telecine-converted flows from the end of the screen to a part of the telecine video, when the IP conversion is performed, the telop that has not been telecine-converted Combing occurs in the part. On the other hand, in the telecine video processing device described in the application example 5, since it can be determined that the telecine conversion has not been performed even if a detection delay occurs, the occurrence of combing in the telop portion is surely prevented. be able to. Therefore, a high quality video can be provided.

Application Example 7 A telecine video signal detection method for detecting that an input video signal is a telecine video signal generated by pull-down processing, the first field image included in the input video signal, and the first field A second field image that is a field two fields before the image is taken in, a block that can divide each field image into a plurality of blocks is defined, and the same position is defined between the first field image and the second field image. Determining whether or not there is a difference between the blocks for each block, and determining whether or not the input video signal is a telecine video signal based on the determination result of the presence or absence of the difference for each block, Based on the determination result of the presence / absence of a difference for each block, the telop that may not include the pull-down process may be included. A lock is detected as a telop area, a plurality of the blocks located around the telop area are detected, and the input video signal for a predetermined block among the detected plurality of blocks is determined for each block. A telecine video signal detection method that determines that the video signal is a non-telecine video signal regardless of the method.

Application Example 8 A telecine video signal detection method for detecting that an input video signal is a telecine video signal generated by pull-down processing,
Capturing a first field image included in the input video signal and a second field image which is a field two fields before the first field image;
A block that can divide each field image into a plurality of blocks is defined, and whether or not there is a difference between blocks at the same position between the first field image and the second field image is determined for each block.
Based on the determination result of the presence or absence of a difference for each block, it is determined for each block whether or not the input video signal is a telecine video signal,
Based on the determination result of the presence or absence of a difference for each block, the block that may include a telop that has not been subjected to the pull-down process is detected as a telop area,
A telecine video signal that defines a border of a predetermined width around the telop area and determines that the input video signal for a portion corresponding to the border is a non-telecine video signal regardless of the determination result for each block Detection method.

Application Example 9 A computer program for detecting that an input video signal is a telecine video signal generated by pull-down processing, the first field image included in the input video signal, and the first field image A first function that captures a second field image that is a field two fields before and a block that can divide each field image into a plurality of fields, and defines between the first field image and the second field image Then, based on the second function for determining the presence / absence of the difference between the blocks at the same position for each block, and the determination result of the presence / absence of the difference for each block obtained by the second function, the input video signal is A third function for determining for each block whether or not it is a telecine video signal, and a difference for each block obtained by the second function A fourth function for detecting, as a telop area, a block that may include a telop that has not been subjected to the pull-down process, and a plurality of the blocks located around the telop area And the input video signal for a predetermined block of the detected plurality of blocks is determined to be a non-telecine video signal regardless of the determination result for each block by the third function. A computer program that allows a computer to implement functions.

Application Example 10 A computer program for detecting that an input video signal is a telecine video signal generated by pull-down processing,
A first function for capturing a first field image included in the input video signal and a second field image that is a field two fields before the first field image;
A second function that defines a block that can divide each field image into a plurality of blocks, and determines whether or not there is a difference between blocks at the same position between the first field image and the second field image. When,
A third function for determining, for each block, whether or not the input video signal is a telecine video signal based on a determination result of the presence or absence of a difference for each block obtained by the second function;
A fourth function for detecting, as a telop area, a block that may include a telop that has not been subjected to the pull-down process, based on a determination result on whether or not there is a difference for each block obtained by the second function; ,
A border having a predetermined width is defined around the telop area, and the input video signal for a portion corresponding to the border is a non-telecine video signal regardless of the determination result for each block by the third function. A computer program for causing a computer to realize the fifth function defined as being.

  According to the telecine video signal detection method described in application example 7 and the computer program described in application example 9, as in the telecine video signal detection apparatus described in application example 1, if the telop portion is a non-telecine video signal, There is an effect that it can be detected with high accuracy. According to the telecine video signal detection method described in application example 8 and the computer program described in application example 10, as in the telecine video signal detection apparatus described in application example 5, if the telop portion is a non-telecine video signal, There is an effect that it can be detected with high accuracy.

  Note that the present invention can be realized in various modes, for example, a method for realizing each part of the telecine video signal detection device or the image display device, a computer program for realizing each part, The present invention can be realized in the form of a recording medium that records the computer program, a data signal that includes the computer program and is embodied in a carrier wave, and the like.

It is a block diagram which shows the video processing apparatus 1000 provided with the telecine video signal detection apparatus 100 as 1st Example to which this invention is applied. It is explanatory drawing which shows an example which divides | segments the pixel difference D for 1 field into a some block. 5 is an explanatory diagram illustrating an example of a difference buffer 60. FIG. It is explanatory drawing for demonstrating IP conversion corresponding to 32 pull-down processing. 4 is a flowchart showing a first half of a telecine video detection process executed by the telecine video signal detection apparatus 100. It is a flowchart which shows the latter half part of the said telecine video detection process. It is explanatory drawing which shows typically the memory content of the determination result buffer 80 after step S210 execution. It is a block diagram which shows the video processing apparatus 2000 provided with the telecine video signal detection apparatus 2100 as 2nd Example to which this invention is applied. It is explanatory drawing which displays as a list the determination conditions of S, T, U, and D mode. It is explanatory drawing which shows an example of the histogram of the video signal in the case where there is no noise and when there is. It is explanatory drawing which shows the conditions which switch to the effect that the video signal identification data VD is a telecine video signal. It is explanatory drawing which shows the conditions which switch to the effect that video signal identification data VD is a non-telecine video signal. 10 is a flowchart showing the latter half of the telecine video detection process executed by the telecine video signal detection apparatus 2100. It is explanatory drawing which shows typically the memory content of the determination result buffer 80 after step S310 execution. It is explanatory drawing which shows the buffer 3080 for determination results obtained by the telecine video signal detection apparatus of 3rd Example. It is explanatory drawing for demonstrating 32 pull-down system.

  Embodiments of the present invention will be described below based on examples with reference to the drawings.

1. First embodiment:
1-A. Constitution:
FIG. 1 is a block diagram showing a video processing apparatus 1000 including a telecine video signal detection apparatus 100 as a first embodiment to which the present invention is applied. As illustrated, the video processing apparatus 1000 includes a telecine video signal detection apparatus 100 and an IP conversion circuit 200.

  The telecine video signal detection apparatus 100 includes three field memories 11 to 13, a pixel difference calculation circuit 20, an in-block pixel difference extraction circuit 30, a histogram circuit 41, an average value calculation circuit 42, and a maximum value calculation circuit 43. A difference determination circuit 50, a difference buffer 60, a 32 pull-down determination circuit 70, a determination result buffer 80, a telop area detection circuit 90, a telop peripheral setting circuit 92, and a determination result output circuit 94.

  The three field memories 11 to 13 each store input images (F (t), F (t-1), and F (t-2): t is time) for three consecutive fields in time. An externally input video signal (input video signal) V1 is a signal indicating a 60-field interlaced video (telecine video) generated by 32 pull-down processing.

  The pixel difference calculation circuit 20 reads the current field image (F (t)) and the field image two fields before (F (t−2)) from the field memories 11 and 13, and calculates the gradation value at the same pixel position. Subtraction is performed to obtain a difference D (hereinafter referred to as “pixel difference”) D for each pixel. Specifically, the pixel difference calculation circuit 20 performs the calculation of the following expression (1) over all the pixels in the field image.

Here, R _xy is the gradation value of the red component for the pixel at the horizontal x and horizontal y positions, and G _xy is the gradation value of the green component for the pixel at the horizontal x and vertical y positions. , B _xy are the gradation values of the blue component for the pixels at the horizontal x and vertical y positions. F _t indicates that it is for the current field image (F (t)), and F _t−2 (R _xy ) is for the field image (F (t−2)) two fields before. It shows that. Abs indicates an absolute value.

That is, according to the equation (1), the pixel differences D (R _xy , G _xy , B _xy ) are obtained by performing the following calculations (a) to (d).

(A) From the red component gradation value F _t-2 (R _xy ) of the pixel at the position (x, y) on the current field image (F (t)), the field image (F (t -2)) The red component gradation value F _t-2 (R _xy ) of the pixel at the upper position (x, y) is subtracted to obtain the absolute value of the answer.
(B) From the green component gradation value F _t-2 (G _xy ) of the pixel at the position (x, y) on the current field image (F (t)), the field image (F (t -2)) The green component gradation value F _t-2 (G _xy ) of the pixel at the upper position (x, y) is subtracted to obtain the absolute value of the answer.
(C) From the blue component gradation value F _t−2 (B _xy ) of the pixel at the position (x, y) on the current field image (F (t)), the field image (F (t -2)) The blue component gradation value F _t-2 (B _xy ) of the pixel at the upper position (x, y) is subtracted to obtain the absolute value of the answer.
(2) The average value of the absolute values for each color component obtained by the above (a) to (c) is defined as a pixel difference D (R _xy , G _xy , B _xy ).

The intra-block pixel difference extraction circuit 30 divides the pixel difference D (R _xy , G _xy , B _xy ) for one field detected by the pixel difference arithmetic circuit 20 into a plurality of blocks, and each pixel included in each block The difference D (R _xy , G _xy , B _xy ) is extracted sequentially for each block. Hereinafter, the pixel difference D (R _xy , G _xy , B _xy ) is simply referred to as “pixel difference D” as necessary.

  FIG. 2 is an explanatory diagram illustrating an example of dividing the pixel difference D for one field into a plurality of blocks. In the figure, SF is a set (pixel difference group) of pixel differences D for one field. If this set is called “difference field data”, the difference field data SF is divided into a plurality of blocks BL with the same area and the same shape. Specifically, when the input video signal V1 has a field image size of, for example, 640 × 240 pixels, the size of the block BL is determined in advance so that the horizontal direction is 40 pixels and the vertical direction is 15 pixels. The difference field data SF is divided into a total of 256 pieces of 16 pieces in the horizontal direction and 16 pieces in the vertical direction. Here, “divide” does not physically separate data but means to divide into a plurality of blocks.

The block BL divides the difference field data SF into a plurality of fields, but it can also be said that each field from which the difference field data SF is generated can be divided into a plurality of fields. The size of the block BL need not be limited to 40 × 15 pixels, but may be other sizes such as 320 × 120, 160 × 60, 80 × 30, and 8 × 3. Thus, the intra-block pixel difference extraction circuit 30 sequentially extracts the pixel differences D (R _xy , G _xy , B _xy ) included in each block BL for each block BL.

  The histogram circuit 41, the average value calculation circuit 42, and the maximum value calculation circuit 43 perform the following processing using the pixel difference D for one block extracted by the intra-block pixel difference extraction circuit 30.

The histogram circuit 41 obtains a frequency distribution of the pixel difference D in each block. Specifically, whether D (R _xy , G _xy , B _xy ) obtained by the pixel difference calculation circuit 20 corresponds to any of the first to fifth difference ranges Th0, Th1, Th2, Th3, Th4. judge. Thus, the size distribution of the pixel difference D in the block is obtained by counting the numbers corresponding to the difference ranges Th0 to Th4 in one block.

  When the gradation value of the pixel is 8 bits, it takes a value of 0 to 255. In this case, the pixel difference D also takes a value of 0 to 255. In this case, the first to fifth difference ranges Th0 to Th4 take the following values, for example.

0 ≦ Th0 <4
4 ≦ Th1 <8
8 ≦ Th2 <12
12 ≦ Th3 <16
16 ≦ Th4

  That is, the histogram circuit 41 outputs the number of pixel differences D corresponding to each of the first to fifth distribution ranges Th0 to Th4 as the frequency distribution His.

  The average value calculation circuit 42 obtains an average value Ave obtained by dividing the sum of the pixel differences D for all the pixels included in each block by the number of pixels in the block. The maximum value calculation circuit 43 obtains the maximum value Max of the pixel differences D of the pixels included in each block.

  The difference determination circuit 50 includes a frequency distribution His in the block detected by the histogram circuit 41, an average value Ave in the block detected by the average value calculation circuit 42, and a maximum value in the block detected by the maximum value calculation circuit. Based on Max, “the difference in which the block at the same position in the current field image (F (t)) and the field image two fields before (F (t−2)) changes with a difference larger than a predetermined level. It is determined whether there is “Yes” or “No difference”, which is a difference smaller than a predetermined level.

  In the above determination, when the gradation value of the pixel is 8 bits, the average value Ave is 10 or more, the maximum value Max is 80 or more, and Th3 in the frequency distribution His is 5 or more. In other words, when any one of Th4 is 2 or more is satisfied, it is determined that “there is a difference” and other than the above is determined as “there is no difference”. That is, when the average value Ave is larger than the predetermined value, when the maximum value Max is larger than the predetermined value, or when a number greater than the predetermined value is found in the difference range with the larger gradation value in the frequency distribution His, " The above determination condition is merely an example, and a numerical value or a mathematical expression itself can be changed to another condition.

  The difference determination circuit 50 indicates a difference determination result indicating that the mode is the S (Same) mode when it is determined that “no difference”, and indicates a difference indicating that the mode is the D (Different) mode when it is determined that “difference exists”. A process of outputting the determination result to the difference buffer 60 is performed.

  FIG. 3 is an explanatory diagram illustrating an example of the difference buffer 60. The difference determination result is accumulated in the difference buffer 60 over six generations going back on the time axis including the present (the top row in the figure). As shown in the figure, every time the latest difference determination result is recorded, the oldest one is deleted in order. As a result, the difference determination result for each block is stored in the difference buffer 60 for six generations. In this embodiment, the frequency distribution His calculated by the histogram circuit 41, the average value Ave calculated by the average value calculation circuit 42, and the maximum value Max calculated by the maximum value calculation circuit 43 are also equivalent to six generations. It is remembered. Note that the example shown is for one block, and actually, an array for six generations is stored for the number of blocks determined in one field.

  In the first embodiment, the difference buffer 60 does not store the frequency distribution His, the average value Ave, and the maximum value Max described above, and stores only the difference determination result (difference mode). You can also.

  Based on the content stored in the difference buffer 60, the 32-pull-down determination circuit 70 determines for each block whether or not the input video signal is a telecine video signal generated by the 32-pull-down process. As described in the section of “Background Art”, since the same field appears in the telecine video signal once every five fields, in the above determination, the latest difference determination stored in the difference buffer 60 is performed. When both the result and the oldest difference determination result are in the S mode and the other difference determination result is in the D mode, it is determined that the signal is a telecine video signal. Otherwise, it is determined that it is not a telecine video signal, that is, a non-telecine video signal.

  The condition for determining whether or not the video signal is a telecine video signal is not limited to the above-described condition, and can be changed to another condition. For example, when all six generations are in the S mode, it is a still image, and in this case as well, it may be determined to be a telecine video signal. The 32 pull-down determination circuit 70 outputs the determination result described above to the determination result buffer 80.

  The determination result buffer 80 has an area for recording the above-described determination results for the number of blocks BL determined in one field, and stores the determination results for each block BL for one field. The stored determination result is stored so that it can be determined which block in one field corresponds to the block.

The telop area detection circuit 90
(A) Based on the content stored in the difference buffer 60, whether each of a plurality of blocks included in one field is a block that may include a telop that has not been subjected to 32 pull-down processing. Judgment,
(B) One block or a plurality of continuous blocks determined to have a possibility of including a telop is detected as a telop area.

  As described above, since the video signal subjected to the 32 pull-down process becomes “no difference” at a rate of once every 5 fields, the process (a) is stored in the difference buffer 60 in detail. When it is determined that the oldest difference determination result is the S mode and the other difference determination results are the D mode, that is, the latest difference determination result is the D mode and the periodicity of the above five fields When the information is collapsed, it is determined that the block is a block that may include a telop that has not been subjected to 32 pull-down processing.

  The telop periphery setting circuit 92 outputs an input video signal for each of a plurality of blocks located in the periphery of the telop area detected by the telop area detection circuit 90, regardless of the determination result by the 32 pull-down determination circuit 70. It is determined that Specifically, the contents stored in the determination result buffer 80 corresponding to each of the plurality of blocks located around the telop area are rewritten to be “non-telecine video signal”.

  The determination result for each block stored in the determination result buffer 80 is sequentially output as the video signal identification data VD by which the determination result output circuit 94 can identify the telecine video signal / non-telecine video signal. Output to the outside.

  The field memories 11 and 13 described above correspond to a “field image capturing unit” provided in the present invention. The pixel difference calculation circuit 20, the intra-block pixel difference extraction circuit 30, the histogram circuit 41, the average value calculation circuit 42, the maximum value calculation circuit 43, and the difference determination circuit 50 are included in the “field difference determination unit” included in the present invention. It corresponds. The 32 pull-down determination circuit 70 is included in the “video signal determination unit” included in the present invention, the telop area detection circuit 90 is included in the “telop area detection unit” included in the present invention, and the telop peripheral setting circuit 92 is included in the present invention. This corresponds to the “telop peripheral setting section”. With the configuration of the telecine video signal detection apparatus 100 described above, it is possible to detect that the input video signal V1 is a telecine video signal generated by 32 pull-down processing.

  The IP conversion circuit 200 receives the video signal identification data VD output from the telecine video signal detection device 100, appropriately selects a process for conversion based on the video signal identification data VD, and selects the input video signal V1 that is an interlace video signal. Convert to 60-field progressive video (IP conversion).

  FIG. 4 is an explanatory diagram for explaining IP conversion corresponding to 32 pull-down processing. The IP conversion shown corresponds to the 32 pull-down process shown in FIG. That is, when the 32 pull-down process shown in FIG. 16 is used, for example, when a cinema video is sent out from a broadcasting station as an NTSC TV signal, the IP conversion shown in FIG. 4 uses the telecine video signal sent from the broadcasting station. IP conversion is performed so that it can be displayed on a 60 frame progressive display device.

  Specifically, in view of the editing mode shown in FIG. 16 in the 32 pull-down process, 60 frames are combined by combining the fields in which the odd-numbered scan lines are left and the fields in which the even-numbered scan lines are left in the telecine video signal. The progressive video signal is generated. As a result, a progressive video image obtained by repeating 2 frames and 3 frames every other frame of the original image is obtained.

  Returning to FIG. 1, in the IP conversion circuit 200 of this embodiment, instead of performing IP conversion in units of one field as described above, IP conversion is performed individually for each block set in one field. That is, the IP conversion circuit 200 receives the input video signal V1, divides one field of the input video signal with the same area and the same shape as the block division in the intra-block pixel difference extraction circuit 30, and each divided block is Whether the video signal is a telecine video signal is determined from the video signal identification data VD input from the telecine video signal detection device 100, and the video signal in the block determined to be a telecine video signal has the above-described mode. Perform IP conversion. On the other hand, the video signal in the block determined not to be a telecine video signal is not subjected to the IP conversion corresponding to the 32 pull-down process described above, and is subjected to, for example, a deinterlace process.

  As a result, the IP conversion circuit 200 converts the input video signal V1 into a 60-frame progressive video signal V2 and outputs it to a display device (not shown).

  Next, the entire process of the telecine video signal detection apparatus 100 will be described. 5 and 6 are flowcharts showing the telecine video detection process executed by the telecine video signal detection apparatus 100. FIG. This telecine video detection process is repeatedly executed every 1/60 seconds, which is the transmission interval of one field of the input video signal V1.

  As shown in FIG. 5, when the processing is started, the telecine video signal detection apparatus 100 first reads the input video signal V1 for one field by driving the pixel difference calculation circuit 20, and reads the read video signal V1. A pixel difference D between the field image and the field image two fields before when the telecine video detection process is executed twice before is calculated (step S110).

  Next, the telecine video signal detection apparatus 100 divides the pixel difference D for one field obtained in step S110 into a plurality of blocks BL by driving the intra-block pixel difference extraction circuit 30 (step S120). A process of selecting one block from among the blocks BL is performed (step S125). The size of the block BL is predetermined. For example, as described above, the horizontal direction is 40 pixels and the vertical direction is 15 pixels. One block selected in step S125 is sequentially shifted every time the process in step S125 is repeatedly executed. Thereafter, the telecine video signal detection device 100 similarly drives the intra-block pixel difference extraction circuit 30 to extract each pixel difference D included in the selected block (step S130).

  Next, the telecine video signal detection apparatus 100 drives the histogram circuit 41, the average value calculation circuit 42, and the maximum value calculation circuit 43, thereby the frequency distribution of the pixel difference D in the block BL that is the extraction target in step S130. His, average value Ave, and maximum value Max are calculated (step S140).

  Next, the telecine video signal detection apparatus 100 drives the difference determination circuit 50 to perform a difference determination based on the frequency distribution His, the average value Ave, and the maximum value Max calculated in step S140 (step S150). This difference determination is as described above, and a difference determination result indicating that the mode is the S mode or the D mode is obtained.

  After execution of step S150, the telecine video signal detection device 100 writes the difference determination result obtained in step S150, which indicates whether the mode is the S mode or the D mode, in the difference buffer 60 (step S160). As described above with reference to FIG. 3, this writing is carried down to the older one that is already recorded, and the oldest one is deleted each time the latest difference determination result is recorded.

  After execution of step S160, the telecine video signal detection apparatus 100 drives the 32 pull-down determination circuit 70 so that the input video signal for the block selected in step S125 is converted into a telecine video based on the contents of the difference buffer 60. It is determined whether it is a signal (step S170). By this determination, the entire selected block is determined to be either a telecine video signal or a non-telecine video signal.

  Thereafter, the telecine video signal detection device 100 writes the determination result obtained in step S170 in the determination result buffer 180 (step S180). With this process, the determination result buffer 180 stores the determination result for each block.

  After execution of step S180, the telecine video signal detection device 100 determines whether or not the block selected in step S125 is the last block among the plurality of blocks included in one field read in step S110. (Step S190) If it is determined that the block is not the last block, the process returns to step S125, and the determination target, that is, the selected block is shifted to the next block. On the other hand, if it is determined in step S190 that the block is the last block, the process proceeds to step S200 in FIG.

  In step S <b> 200, the telecine video signal detection apparatus 100 drives the telop area detection circuit 90 to perform processing for detecting a telop area based on the content stored in the difference buffer 60. As described above, the block in which the oldest difference determination result stored in the difference buffer 60 is the S mode and the other difference determination result is the D mode includes a telop that has not been subjected to the 32 pull-down process. Since there is a possibility, one or a series of such blocks is detected as a telop area.

  Next, by driving the telop periphery setting circuit 92, a plurality of blocks located around the telop area detected in step S200 are detected, and the contents stored in the determination result buffer 80 corresponding to each of the plurality of blocks are stored. Then, it is rewritten to be “non-telecine video signal” (step S210). Here, the “periphery” includes upper, lower, left, right, upper left, lower left, lower right, and upper right. That is, the “periphery” is a block that completely surrounds the telop area including the diagonal direction. The blocks around the detected telop area are hereinafter referred to as “peripheral blocks”.

  FIG. 7 is an explanatory diagram schematically showing the contents stored in the determination result buffer 80 after execution of step S210. “BL” in the figure is a block for dividing difference field data for one field. For each block BL, a determination result as to whether the block BL is a video signal subjected to the pull-down process (that is, a telecine video signal) or a non-telecine video signal is stored. In the figure, “32” is a block stored as a video signal subjected to 32 pull-down processing, and “IV” is a block stored as a non-telecine video signal. In particular, “IV (* 1)” is a block detected as a telop area in step S200, and “IV (* 2)” is a peripheral block detected in step S210.

  That is, as shown in the figure, a telop area constituted by three blocks in the fourth to second columns from the right in the second row from the bottom is stored as a non-telecine video signal. Furthermore, a total of 12 blocks in the 5th to 1st columns from the right in the 3rd row from the bottom, 5th and 1st columns from the right in the 2nd row from the bottom, and 5th to 1st columns from the right in the 1st row from the bottom Are also stored as non-telecine video signals.

  After execution of step S210, the determination results for each block stored in the determination result buffer 80 are sequentially output as video signal identification data VD (step S220). When the determination result is a telecine video signal, the video signal identification data VD is output as, for example, “high level”, and when the determination result is a non-telecine video signal, the video signal identification data VD is, for example, “low level”. Is output. After the execution of step S220, the process returns to “Return” to end the telecine video signal detection process once.

1-B. effect:
According to the telecine video signal detection apparatus 100 of the first embodiment configured as described above, the current field image (F (t)) and the field image two fields before (F (t-2)) are between. Whether “with difference” or “without difference” is determined for each block BL obtained by dividing the field image into a plurality of blocks. For this reason, for example, in the case of a video signal in which a content that has not been pulled down 32 is inserted in one field image such as a telop (a telop of characters, graphics, etc.), only the block on which the content is superimposed is non-telecine. It can be determined that it is a video signal.

  Furthermore, according to the telecine video signal detection apparatus 100, as illustrated in FIG. 7, the input video signal for the peripheral block IV (* 2) of the telop area IV (* 1) is preliminarily determined to be a non-telecine video signal. Determined. Since telops such as characters and figures move on the screen, the peripheral block IV (* 2) has a high possibility of entering telops in the next field, but it is determined in advance that it is a non-telecine video signal. Therefore, even if a detection delay occurs to some extent, it can be reliably detected that the video signal is a non-telecine video signal. Therefore, it is possible to detect the telop portion with high accuracy when it is a non-telecine video signal.

  In this embodiment, since the entire range around the telop area, that is, upper, lower, left, right, upper left, lower left, lower right, and upper right is determined in advance as a non-telecine video signal, the next field Thus, it is possible to reliably determine that a block in which a telop may enter is a non-telecine video signal.

  According to the video processing apparatus 1000 including the telecine video signal detection apparatus 100 with the above effect, when the video signal is such that a telop that has not been telecine-converted flows from a screen end to a part of the telecine video. It is possible to prevent the IP conversion for performing the 32 pull-down correction from being performed on the telop portion. Therefore, combing can be prevented from occurring in the telop portion. Therefore, a high quality video can be provided.

2. Second embodiment:
FIG. 8 is a block diagram showing a video processing apparatus 2000 including a telecine video signal detection apparatus 2100 as a second embodiment to which the present invention is applied. As shown in the figure, the video processing device 2000 includes a telecine video signal detection device 2100 and the same IP conversion circuit 200 as in the first embodiment.

  The telecine video signal detection apparatus 2100 differs from the telecine video signal detection apparatus 100 of the first embodiment in the processing contents executed by the difference determination circuit 2050, the 32 pull-down determination circuit 2070, and the telop peripheral setting circuit 2092. The other circuits 20 to 43, 90, 94, and both buffers 60, 80 are the same. The same components as those in the first embodiment will be described using the same reference numerals. The difference determination circuit 2050, the 32 pull-down determination circuit 2070, and the telop peripheral setting circuit 2092 that are different from the first embodiment will be described next.

  In the difference determination circuit 50 of the first embodiment, it has been determined whether the S mode indicating “no difference” or the D mode indicating “difference” is applicable. The difference determination circuit 2050 determines which of the four modes, that is, the S mode, the T mode, the U mode, and the D mode.

  In the T (Tentative Same) mode, the relationship between the block in the current field image (F (t)) and the block two fields before is determined as “difference” in the conventional difference size determination. This is a state where “no difference” is determined in consideration of the case of a video with noise.

  In the U (Unknown) mode, the relationship between the block in the current field image (F (t)) and the block two fields before is the conventional difference determination (determination of whether the difference is larger or smaller than the threshold). It is in a state where neither “with difference” nor “no difference” can be determined. In other words, the determination is difficult.

  Note that the determination of whether the S, T, U, or D mode is made by the difference determination circuit 2050 is based on the frequency distribution His in the block detected by the histogram circuit 41 and the block in the block detected by the average value calculation circuit 42. This is performed based on the average value Ave and the maximum value Max in the block detected by the maximum value calculation circuit. Specifically, the determination is made according to the following conditions.

  FIG. 9 is an explanatory diagram for displaying a list of determination conditions for the S, T, U, and D modes. The numerical values in the determination conditions shown in the figure are described as the case where the gradation value of the pixel takes a value from 0 to 255. As shown in the figure, the determination condition for entering the S mode is that when the average value Ave is 5 or less and both the distribution ranges Th3 and Th4 in the frequency distribution His both have the value 0 (that is, the distribution is on the larger side). When there is no pixel difference D to be performed).

  The determination conditions for entering the T mode are (i) the average value Ave is 6 or less, (ii) Th3 in the frequency distribution His is 5 or less, (iii) Th4 is 1 or less, (Iv) The average value Ave is satisfied when all of the average values for the past five generations of the corresponding block stored in the difference buffer 60 are satisfied. The average value for the five generations stored in the difference buffer 60 is the average value stored in the first position (order from the newest, the same applies hereinafter) to the fifth position of the difference buffer 60 at this time. is there. The physical meaning of the determination conditions (i) to (iv) will be described below.

  FIG. 10A is an example of a histogram of a video signal without noise. As shown in the figure, the frequency distribution H1 indicated by the solid line is for “S: no difference”, and the frequency distribution H2 indicated by the one-dot chain line is for “D: difference”. The frequency distribution H1 in the case of “S: no difference” is sufficiently biased toward the side where the pixel difference becomes 0, and the distribution is clearly divided between “with difference” and “without difference”. For this reason, it is easy to set the threshold value TH for determination, and it is possible to determine whether there is “difference” or “no difference” with high accuracy.

  FIG. 10B is an example of a histogram of a video signal with noise. As shown in the figure, the frequency distribution H1 in the case of “S: no difference” shows a value larger than 0 even when the pixel difference is relatively large. However, when there is noise, the noise is randomly superimposed on the entire screen up to a certain level. For this reason, it is difficult to clearly distinguish the distribution between “with difference” and “without difference”. Although it is possible to cope by changing the threshold value TH for determination, it is difficult to determine how much to change.

  Depending on the content, the noise may be more or less. Since there is a lot of noise and the influence on judgment is large, here we first considered reducing the influence. The above condition (iv) is for reducing the influence. As described above, the condition (iv) is “the average value Ave is smaller than any of the average values of the past five generations for the corresponding block stored in the difference buffer”, in other words, The sum Sum (0) of the pixel differences D for all the pixels included in the block is smaller than any of the sums Sum (−1) to Sum (−5) for the past five generations for the corresponding block. . If the sum Sum (0) of the current pixel difference D is smaller than any of the sums Sum (−1) to Sum (−5) for the past five generations, even if the video signal has noise, “ Since there is a high possibility of “no difference”, the T mode is set.

  The above conditions (i) to (iii) define the maximum allowable range of noise. The T mode was selected when the average value Ave was 6 or less, Th3 in the frequency distribution His was 5 or less, and Th4 was 1 or less. The content having noise that does not satisfy any one of the conditions (i) to (iii) is set to the D mode or the U mode, and the 32 pull-down process is not performed.

  The above conditions (i) to (iii) include the determination condition for the S mode, but when the determination condition for the S mode is satisfied, the determination condition for the T mode is not satisfied. S mode is assumed.

  Returning to FIG. 9, the determination conditions for entering the U mode are all that the average value Ave is 10 or less, Th3 in the frequency distribution His is 8 or less, and Th4 is 2 or less. It was time to meet. That is, even when the average value Ave is equal to or less than a certain value (= 10), a distribution exceeding the values (8, 2) in the large distribution range Th3, Th4 in the frequency distribution His is not found. Since neither the D mode nor the S mode can be determined, the U mode is set.

  The determination condition for entering the D mode is that the average value Ave is 10 or more, the maximum value Max is 80 or more, Th3 in the frequency distribution His is 5 or more, and Th4 is 2 or more. When any one of them was satisfied. That is, when the average value Ave is greater than or equal to a certain value (= 10), or when the maximum value Max is greater than or equal to a certain value (= 80), or the larger distribution range Th3, Th4 in the frequency distribution His. When a distribution greater than a certain value (5, 2) is observed, the D mode is set. The determination conditions are preferably performed in the order of S mode, T mode, U mode, and D mode.

  The above-described determination conditions for the S, D, T, and U modes are merely examples, and numerical values and mathematical expressions themselves can be changed to other conditions. In short, it can be determined that the S mode has no difference, the T mode has noise but no difference, the U mode has difficulty in determination, and the D mode has difference. Any condition can be used as long as it is a condition. The S mode corresponds to the “first mode” in the claims column, and the D mode corresponds to the “second mode” in the claims column.

  Returning to FIG. 8, the 32 pull-down determination circuit 2070 determines for each block whether or not the input video signal is a telecine video signal generated by the 32 pull-down process based on the content stored in the difference buffer 60. To do. The determination result is output to the determination result buffer 80 for each block as video signal identification data VD that can identify the telecine video signal / non-telecine video signal.

  FIG. 11 is an explanatory diagram showing conditions for switching the video signal identification data VD to a telecine video signal. 60a in the figure is a field for storing the difference mode in the difference buffer 60 described above with reference to FIG. Similar to FIG. 3, the leftmost difference mode is the latest difference mode, and the generation is older as it is located to the right. As shown in FIG. 11A, when the latest differential mode is “S”, it is determined that the input video signal is a telecine video signal, and the video signal identification data VD is a telecine video signal. Switch to high level to indicate that. Also, as shown in FIG. 11B, when the latest differential mode is “T”, it is determined that the input video signal is a telecine video signal, and the video signal identification data VD is a telecine video. The signal is switched to a high level indicating that it is a signal. This means that the T mode functions as the S mode when switching from the non-telecine video signal to the telecine video signal.

  When the video signal identification data VD is at a low level and the latest differential mode is “U” or “D”, the video signal identification data VD is maintained at that level without being switched to a high level. This means that the U mode functions as a D mode when switching from a non-telecine video signal to a telecine video signal.

  FIG. 12 is an explanatory diagram showing conditions for switching to the fact that the video signal identification data VD is a non-telecine video signal. FIG. 12D shows conditions for returning to the low level after the video signal identification data VD is switched to the high level. In the case of FIGS. 12A to 12C, the high level is maintained without returning to the low level.

  As shown in FIGS. 12A to 12D, the contents of the field 60a of the difference buffer 60 are “D” for the second place (order from the newest, the same applies hereinafter), and “D” for the third place. The fourth place is “D”, the fifth place is “D”, and the sixth place is “S”. That is, it is assumed that “D” is input for four generations after “S” is input, and then the latest differential mode is input. Then, when the latest difference mode is “S” as shown in FIG. 12A, the editing mode of the five cycles shown in FIG. 16 is shown, so that the input video signal is determined to be a telecine video signal. Thus, the video signal identification data VD maintains a high level indicating that it is a telecine video signal.

  Also, as shown in FIG. 12B, when the latest differential mode is “T”, it is determined that the input video signal is a telecine video signal, and the video signal identification data VD is a telecine video signal. Maintain a high level of effect. Further, as shown in FIG. 12C, when the latest differential mode is “U”, it is determined that the input video signal is a telecine video signal, and the video signal identification data VD is a telecine video signal. Maintain a high level of effect. This means that the T mode and the U mode function as the S mode when switching from the telecine video signal to the non-telecine video signal.

  On the other hand, when the latest differential mode is “D” as shown in FIG. 12D, it is determined that the input video signal is switched to the non-telecine video signal, and the video signal identification data VD is a non-telecine video signal. Switch to low level to indicate that there is.

  In the description of FIG. 12, the contents from the second place to the fifth place are “DDDD”, but it is not necessarily limited to this arrangement. For example, “SSSS” may be another arrangement. Even in such a case, it may be configured to continue the telecine video signal. This is because “SSSS” is a still image, and in this case as well, it can be a telecine video signal.

  Returning to FIG. 8, the telop periphery setting circuit 2092 outputs an input video signal for a predetermined block among a plurality of blocks located in the periphery of the telop area detected by the telop area detection circuit 90 to a 32 pull-down determination circuit 2070. Regardless of the result of the determination, the non-telecine video signal is determined. The “predetermined block” is determined based on the difference mode stored in the difference buffer 60, and details of the determination will be described later. As shown in the figure, in the second embodiment, the telop peripheral setting circuit 2092 and the difference buffer 60 are connected, and the telop peripheral setting circuit 2092 displays the difference mode stored in the telop peripheral setting circuit 2092. Can be captured.

  Next, the overall processing of the telecine video signal detection apparatus 2100 will be described. FIG. 13 is a flowchart showing the latter half of the telecine video detection process executed by the telecine video signal detection apparatus 2100. The first half of this telecine video detection process is the same as that of FIG. 5 used in the first embodiment. Note that the difference determination process in step S150 and the determination process of whether or not the video signal is a telecine video signal in step S170 in FIG. 5 are executed by driving the difference determination circuit 2050 and the 32 pull-down determination circuit 2070. The processing contents are different from those of the first embodiment.

  If it is determined in step S190 in FIG. 5 that the selected block is the last block, the telecine video signal detection device 2100 advances the process to step S300 in FIG. In step S300, the telecine video signal detection apparatus 2100 drives the telop area detection circuit 90 to perform processing for detecting a telop area based on the content stored in the difference buffer 60. The process of step S300 is the same as the process of step S200 in the first embodiment. The oldest difference determination result stored in the difference buffer 60 is the S mode, and the other difference determination results are the D mode. Since there is a possibility that a block that is a telop that has not been subjected to 32 pull-down processing, one or a series of such blocks is detected as a telop area.

  Next, by driving the telop periphery setting circuit 2092, a plurality of blocks (peripheral blocks) located in the periphery of the telop area detected in step 300 are detected and stored in the difference buffer 60 from the peripheral blocks. The block having the S-mode in which the determination result five generations ago and the latest difference determination result are selected, and the content stored in the determination result buffer 80 corresponding to the selected block is “non-telecine video signal”. (Step S310). Here, the “periphery” refers to the upper, lower, left, right, upper left, lower left, lower right, and upper right as in the first embodiment.

  FIG. 14 is an explanatory diagram schematically showing the contents stored in the determination result buffer 80 after execution of step S310. “BL” in the figure is a block for dividing difference field data for one field. For each block BL, a determination result as to whether the block BL is a video signal subjected to the pull-down process (that is, a telecine video signal) or a non-telecine video signal is stored. In the figure, “32” is a block stored as a video signal subjected to 32 pull-down processing, and “IV” is a block stored as a non-telecine video signal. In particular, “IV (* 1)” is a block detected as a telop area in step S300, and “IV (* 3)” is a block selected as a S mode from the peripheral blocks in step S310.

  That is, as shown in the figure, a telop area constituted by three blocks in the fourth to second columns from the right in the second row from the bottom is stored as a non-telecine video signal. Furthermore, for the 9 blocks in total from the 5th to 2nd column from the right in the 3rd row from the bottom, the 5th column from the right in the 2nd row from the bottom, and the 5th to 2nd column from the right in the 1st row from the bottom, It is stored as a non-telecine video signal as being a block selected as being in S mode among the blocks. This stored content is compared with the stored content in the first embodiment (see FIG. 7). The three blocks BL3, BL2, and BL1 in the third row to the first row from the bottom of the rightmost column are subjected to 32 pull-down processing. The difference is that it is stored as an applied video signal.

  Returning to FIG. 13, the telecine video signal detection apparatus 2100 advances the process to step S320 after executing step S310. The process of step S320 is the same as the process of step S220 in the first embodiment.

  According to the telecine video signal detection device 2100 of the second embodiment configured as described above, the accuracy of determining the presence or absence of a difference can be increased by adding the T mode and the U mode. Furthermore, as illustrated in FIG. 14, the input video signal for the predetermined block IV (* 3) among the peripheral blocks of the telop area IV (* 1) is determined in advance to be a non-telecine video signal. For this reason, only when the latest determination result is definitely different, that is, when the S mode is entered, is set as the telop area IV (* 1), and when the latest determination result is definitely no difference, that is, when the D mode is set. Only when it becomes a predetermined block IV (* 3) determined as a non-telecine video signal. A block in which the latest determination result has no difference can be said to be a block with a high possibility of moving the telop because the determination result by the 32 pull-down determination circuit 2070 is a telecine video signal. For this reason, it is possible to improve the accuracy of detecting a telop area and the accuracy of detecting a block where the telop is likely to move. Therefore, according to the telecine video signal detection apparatus 2100, a telop portion can be detected with high accuracy as a non-telecine video signal.

3. Third embodiment:
Next, a third embodiment of the present invention will be described. In the telecine video signal detection apparatus 100 of the first embodiment, the peripheral blocks located around the telop area are determined in advance as non-telecine video signals. Instead, the telecine video signal detection of the third embodiment is performed. The device does not define the entire peripheral block located around the telop area as a non-telecine video signal, but defines a border of a predetermined width around the telop area, and only the border is a non-telecine video signal. It is set as the structure determined to be.

  FIG. 15 is an explanatory diagram showing a determination result buffer 3080 obtained by the telecine video signal detection device of the third embodiment. In the same manner as in the first embodiment, IV (* 1) in the figure is detected as a telop area, and an edge part (hatched part in the figure) EG having a predetermined width is defined around the telop area, and corresponds to the edge part EG. The input video signal for the part to be processed is determined to be a non-telecine video signal regardless of the determination result for each block by the 32 pull-down determination circuit.

  According to the telecine video signal detection apparatus of the third embodiment, the border is highly likely to enter a telop in the next field, but it is determined in advance that it is a non-telecine video signal. Even if a small amount of occurrence occurs, it can be reliably detected that it is a non-telecine video signal. Therefore, as in the first embodiment, it is possible to detect the telop portion with high accuracy when it is a non-telecine video signal. In addition, it is possible to prevent the combing from occurring in the telop portion by using the telecine video signal detection device of the third embodiment and the video processing device including the same IP conversion circuit 200 as the first embodiment. it can.

  In the third embodiment, the border portion has the same width in each of the upper, lower, left, and right directions. However, the border does not necessarily have to be the same size, and may have a width that is different from the upper, lower, left, and right. Moreover, it can also be set as the width | variety of a size which is individually different on the upper and lower sides and right and left. Moreover, in the said 3rd Example, although the edge part was made into the rectangle, it can replace with this and can also be made into other shapes, such as circular and an ellipse.

4). Other embodiments:
The present invention is not limited to the above-described first to third embodiments and modifications thereof, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible. Is also possible.

(1) In the first and second embodiments, the periphery of the telop area is a block adjacent in the upper, lower, left, right, upper left, lower left, lower right, and upper right directions. Alternatively, the blocks may be adjacent to each other in the four directions of down, left, and right. In the first and second embodiments, only one layer adjacent to the periphery of the telop area is used as a peripheral block. However, two or more blocks adjacent to the outside of the first layer are included in the peripheral block. It is good also as a structure.

(2) In the third embodiment, the border portion EG is an area narrower than the peripheral blocks located around the telop area, but may be an area wider than the peripheral blocks instead.

(3) In each of the above embodiments, the pixel difference is first obtained between the current field image and the field image two fields before, and the difference field data, which is a set of pixel differences for one field, is divided into blocks. However, instead of this, the current field image and the field image two fields before are divided into a plurality of blocks, and the current field image side block and the field image two fields previous field image side It is good also as a structure which calculates | requires a pixel difference between blocks. Even with this configuration, the same effects as those of the embodiments can be obtained.

(4) In each of the above embodiments, the gradation value of the pixel of the input video signal has been described as 8 bits (256 gradations). However, even if the input video signal has other bits (gradation values). It can be implemented and has the same effects.

(5) The video processing apparatuses according to the first to third embodiments can be applied to devices capable of displaying progressive video such as information devices such as personal computers and display devices such as liquid crystal televisions.

(6) In the first and second embodiments described above, the telecine video signal generated by the 32 pulldown process is detected. However, the present invention is not limited to the telecine video signal generated by the 32 pulldown process. It may be configured to detect a telecine video signal generated by pull-down processing of another method such as 23 pull-down processing or 22 pull-down processing.

(7) In the first to third embodiments, a part of the configuration realized by the hardware may be replaced with software. Conversely, a part of the configuration realized by the software is changed. It may be replaced with hardware. That is, an embodiment using a computer program for causing a computer to realize the functions of the circuits in the first to third embodiments may be used.

DESCRIPTION OF SYMBOLS 11 ... Field memory 20 ... Pixel difference calculation circuit 30 ... In-block pixel difference extraction circuit 41 ... Histogram circuit 42 ... Average value calculation circuit 43 ... Maximum value calculation circuit 50, 2050 ... Difference judgment circuit 60 ... Difference buffer 70, 2070 ... 32 pull-down determination circuit 80 ... determination result buffer 90 ... telop area detection circuit 92, 2092 ... telop peripheral setting circuit 94 ... determination result output circuit 100, 2100 ... telecine video signal detection device 200 ... IP conversion circuit 1000, 2000 ... video processing Device D ... Pixel difference V1 ... Input video signal V2 ... Video signal VD ... Video signal identification data SF ... Difference field data BL ... Block EG, EGX ... Field border Th0-Th4 ... First to fifth distribution ranges Max ... Maximum Value Ave ... Average value His ... Frequency Cloth

Claims (10)

A telecine video signal detection device for detecting that an input video signal is a telecine video signal generated by pull-down processing,
A field image capturing unit that captures a first field image included in the input video signal and a second field image that is a field two fields before the first field image;
Define a block that can divide each field image into a plurality of blocks, and determine whether there is a difference between blocks in the same position between the first field image and the second field image. And
A video signal determination unit that determines, for each block, whether or not the input video signal is a telecine video signal based on the determination result of the difference between blocks obtained by the inter-field difference determination unit;
A telop area detection unit that detects, as a telop area, the block that may include a telop that has not been subjected to the pull-down process, based on the determination result of the difference between blocks obtained by the inter-field difference determination unit When,
A plurality of the blocks located around the telop area are detected, and the input video signal for a predetermined block among the detected plurality of blocks is determined according to the determination result for each block by the video signal determination unit. A telecine video signal detection device comprising: a telop peripheral setting unit that determines that the video signal is a non-telecine video signal. The telecine video signal detection device according to claim 1,
The telop peripheral setting unit
A telecine video signal detection device comprising a configuration for selecting all of the detected blocks as the predetermined block. The telecine video signal detection device according to claim 1,
The inter-field difference determining unit
In a configuration for determining which of the three or more modes including at least the first mode that has no difference, the second mode that has a difference, and the third mode that is difficult to determine. Yes,
The telop area detection unit
The determination result by the difference determination unit is traced back on the time axis, and a block whose determination result five generations before is the first mode and whose latest determination result is the second mode is detected as the telop area. Is a configuration to
The telop peripheral setting unit
For each of the plurality of blocks detected as being located around the telop area, it is determined whether or not a condition that the determination result of five generations before and the latest determination result are both in the first mode is satisfied, A telecine video signal detection apparatus comprising a configuration for selecting a block determined to satisfy the predetermined block as the predetermined block. The telecine video signal detection device according to any one of claims 1 to 3,
The inter-field difference determining unit
A pixel difference calculation unit that obtains a pixel difference by subtracting a gradation value at the same pixel position between the first field image and the second field image;
An intra-block pixel difference extraction unit that divides a group of pixel differences for one field detected by the pixel difference calculation unit into a plurality of the blocks, and sequentially extracts pixel differences included in each block for each block;
A telecine video signal detection device comprising: a block-by-block difference determination unit that determines whether or not there is a difference for each block based on the extracted pixel difference for each block. A telecine video signal detection device for detecting that an input video signal is a telecine video signal generated by pull-down processing,
A field image capturing unit that captures a first field image included in the input video signal and a second field image that is a field two fields before the first field image;
Define a block that can divide each field image into a plurality of blocks, and determine whether there is a difference between blocks in the same position between the first field image and the second field image. And
A video signal determination unit that determines, for each block, whether or not the input video signal is a telecine video signal based on the determination result of the difference between blocks obtained by the inter-field difference determination unit;
A telop area detection unit that detects, as a telop area, the block that may include a telop that has not been subjected to the pull-down process, based on the determination result of the difference between blocks obtained by the inter-field difference determination unit When,
A border of a predetermined width is defined around the telop area, and the input video signal for a portion corresponding to the border is a non-telecine video signal regardless of the determination result for each block by the video signal determination unit. A telecine video signal detection device comprising: a telop periphery setting unit which is determined to be. A video processing device for processing video including telecine video,
The telecine video signal detection device according to any one of claims 1 to 5,
A video processing apparatus comprising: an IP conversion unit that performs IP conversion corresponding to the pull-down process on a signal portion determined to be the telecine video signal by the telecine video signal detection device. A telecine video signal detection method for detecting that an input video signal is a telecine video signal generated by pull-down processing,
Capturing a first field image included in the input video signal and a second field image which is a field two fields before the first field image;
A block that can divide each field image into a plurality of blocks is defined, and whether or not there is a difference between blocks at the same position between the first field image and the second field image is determined for each block.
Based on the determination result of the presence or absence of a difference for each block, it is determined for each block whether or not the input video signal is a telecine video signal,
Based on the determination result of the presence or absence of a difference for each block, the block that may include a telop that has not been subjected to the pull-down process is detected as a telop area,
A plurality of the blocks located around the telop area are detected, and the input video signal for a predetermined block of the detected plurality of blocks is converted into a non-telecine video signal regardless of the determination result for each block. A telecine video signal detection method defined as being present. A telecine video signal detection method for detecting that an input video signal is a telecine video signal generated by pull-down processing,
Capturing a first field image included in the input video signal and a second field image which is a field two fields before the first field image;
A block that can divide each field image into a plurality of blocks is defined, and whether or not there is a difference between blocks at the same position between the first field image and the second field image is determined for each block.
Based on the determination result of the presence or absence of a difference for each block, it is determined for each block whether or not the input video signal is a telecine video signal,
Based on the determination result of the presence or absence of a difference for each block, the block that may include a telop that has not been subjected to the pull-down process is detected as a telop area,
A telecine video signal that defines a border of a predetermined width around the telop area and determines that the input video signal for a portion corresponding to the border is a non-telecine video signal regardless of the determination result for each block Detection method. A computer program for detecting that an input video signal is a telecine video signal generated by pull-down processing,
A first function for capturing a first field image included in the input video signal and a second field image that is a field two fields before the first field image;
A second function that defines a block that can divide each field image into a plurality of blocks, and determines whether or not there is a difference between blocks at the same position between the first field image and the second field image. When,
A third function for determining, for each block, whether or not the input video signal is a telecine video signal based on a determination result of the presence or absence of a difference for each block obtained by the second function;
A fourth function for detecting, as a telop area, a block that may include a telop that has not been subjected to the pull-down process, based on a determination result on whether or not there is a difference for each block obtained by the second function; ,
A plurality of the blocks located around the telop area are detected, and the input video signal for a predetermined block among the detected plurality of blocks is determined according to the determination result for each block by the third function. A computer program for causing a computer to realize the fifth function that is determined to be a non-telecine video signal. A computer program for detecting that an input video signal is a telecine video signal generated by pull-down processing,
A first function for capturing a first field image included in the input video signal and a second field image that is a field two fields before the first field image;
A second function that defines a block that can divide each field image into a plurality of blocks, and determines whether or not there is a difference between blocks at the same position between the first field image and the second field image. When,
A third function for determining, for each block, whether or not the input video signal is a telecine video signal based on a determination result of the presence or absence of a difference for each block obtained by the second function;
A fourth function for detecting, as a telop area, a block that may include a telop that has not been subjected to the pull-down process, based on a determination result on whether or not there is a difference for each block obtained by the second function; ,
A border having a predetermined width is defined around the telop area, and the input video signal for a portion corresponding to the border is a non-telecine video signal regardless of the determination result for each block by the third function. A computer program for causing a computer to realize the fifth function defined as being.

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