JP2002335441A - Telecine video signal detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telecine video signal detector that can accurately determine a telecine video signal even when a caption is inserted to the telecine video signal converted by the 2-3 pull-down system. SOLUTION: The telecine video signal detector includes a 1-frame delay unit 13 that delays an input video signal by one frame, a subtractor 14 that takes a difference between the input video signal and an output of the 1-frame delay unit 13, an absolute value device 15 that obtains an absolute value of an output from the absolute value device 15, a comparator 16 that decides a pixel of the output of the absolute value device 15 to be a still pixel when the output of the absolute device 15 is smaller than a threshold value or to be a moving pixel when the output is greater than the threshold value and provides an output of a binary value corresponding to the result of judgment, a statistic processing unit 17 that accumulates outputs of the comparator 16 for one field and provides an output, a majority decision unit 18 that determines whether the field is a still picture field or a moving picture field depending on whether or not an output of the statistic processing unit 17 exceeds a value corresponding to a prescribed number of moving pixels, and a telecine determination unit 19 that decides whether or not the input video signal is the telecine video signal converted by the 2-3 pull- down system depending on whether or not an output of the majority decision unit 18 indicates repetition of a still picture field and a moving picture field under a prescribed rule.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal conversion apparatus for converting an input video signal which is an interlaced scan into a video signal of progressive scan, and more particularly to a video signal converted from a movie film signal by a 2-3 pull-down system. The present invention relates to a telecine video signal detection device used in a telecine video signal processing device that generates a new interpolated scanning line from a standard television signal that is an interlaced scanning signal and converts it into a progressively scanned video signal.

[0002]

2. Description of the Related Art In a motion picture film, a spatial image is sampled at 24 frames per second, whereas in the NTSC standard television signal, a spatial image is sampled at 30 frames per second, and 60 fields per second for interlaced scanning. Has been sampled. Accordingly, an image signal of a cinema film of 24 frames per second is transmitted to the television receiver as an interlaced telecine video signal of 60 fields per second by 2-3 pull-down conversion.

In recent years, there has been an increasing demand for high-definition television receivers that convert interlaced scanning signals into sequential scanning signals for display. This interlaced scanning signal (Interlaced
scanning signal)
The conversion to a ning signal is called IP conversion. In particular, in a telecine video signal converted to an interlaced scanning signal by the 2-3 pull-down method, it is possible to restore a progressive scanning signal before being converted by the 2-3 pull-down method and convert the signal to a progressively scanned television signal. , I
This is an important technique in preventing image quality degradation during P conversion and generating an accurate progressive scanning signal.

In the 2-3 pull-down system, a movie film of 24 frames per second is converted into a standard television signal of 60 fields per second. Therefore, two frames of the movie film correspond to five fields of the standard television signal.
This converts from the first frame of the motion picture film to the first and second fields of the standard television signal, and from the second frame of the motion picture film to the third field, the fourth field of the standard television signal. This is realized by converting into a field and a fifth field.
By repeating the same conversion for the following frames, the movie film can be converted to a standard television signal.

[0005] FIG. 8 is a diagram showing an I / O signal using the characteristics of a standard television signal converted by the 2-3 pull-down method.
FIG. 2 is a block diagram showing a configuration of a conventional telecine video signal detection device in a telecine video signal processing device that performs P conversion (for example, the video signal processing circuit shown in FIG. 1 of Japanese Patent Application Laid-Open No. 5-188884). In the figure, 51 is an input terminal of a video signal, 52 is an output terminal of a telecine determination signal,
3 is a one-frame delay unit, 54 is a subtractor, 55 is an absolute value unit, 56 is a comparator, 57 is a statistical processor, 58 is a majority decision unit, and 59 is a telecine decision unit.

In the standard television signal converted by the 2-3 pull-down system, the first frame of the cinema film corresponds to the first and second fields of the standard television signal, Frame 2 is the third field of the standard television signal,
It corresponds to the fourth field and the fifth field. Similarly, the third frame of the motion picture film corresponds to the sixth and seventh fields of the standard television signal, and the fourth frame of the motion picture film corresponds to the eighth field, the ninth field of the standard television signal. And the tenth field. FIG. 11 of the above-mentioned JP-A-5-183884 conceptually shows a state of the conversion by the 2-3 pull-down method.

The input terminal 51 receives a standard television signal obtained by converting each frame image of a movie film by the 2-3 pull-down method as an input video signal. The video signal input from the input terminal 51 is delayed by one frame (that is, two fields) by the one-frame delay unit 53. Next, the difference between the input video signal and the output signal of the one-frame delay unit 53 (that is, the video signal delayed by two fields from the video signal input to the input terminal 51) is calculated by the subtractor. The absolute value calculator 55 calculates the absolute value of the output of the subtractor 54. The comparator 56 determines that the pixel is a still pixel if the value of the absolute value calculator 55 is smaller than a predetermined threshold, and determines that the pixel is a moving pixel if the value is larger than the threshold. The value binarized by the comparator 56 as a still pixel or a moving pixel is accumulated by the statistical processor 57 over one field.

For example, the comparator 56 outputs a binarized value where the value corresponding to a still pixel is "0" and the value corresponding to a moving pixel is "1". In this case, if all the pixels of one field accumulated by the statistical processor 57 are still pixels (that is, if the number of moving pixels is 0), the output value of the statistical processor 57 becomes “0” and even one of the pixels is output. "1" if video element is included
Output the above values. If the output value from the statistical processor 57 is a value corresponding to the number of moving pixels 0 (that is, the output value is “0”), the majority decision unit 58 determines that the field is a still image field; If (that is, "1"
If so, the field is determined to be a moving image field.

According to the characteristics of the 2-3 pull-down method,
Since the third field and the fifth field of the input video signal are common (that is, the same image signal), and the eighth field and the tenth field are common (that is, the same image signal), the input video signal If the signal is a telecine video signal, the majority decision unit 58 periodically determines once every five fields as a still image field. When there is a still image field in one cycle of these five fields, the telecine judging device 59 judges that the video signal input from the input terminal 51 is a telecine video signal, and outputs the result to the output terminal 52. Otherwise, it is determined that the signal is not a telecine video signal, and the result is output to the output terminal 52.

[0010]

However, in the above-described conventional telecine video signal detecting device, when a subtitle representing a movie line or the like is present on the telecine video signal, the subtitle is normally sampled at 60 fields per second. After being converted to standardized standard television signals,
It may not be possible to accurately determine whether the input video signal is a telecine video signal changed by the 2-3 pull-down method. That is, due to the characteristics of the 2-3 pull-down scheme, the third and fifth fields of the input video signal are common, but if subtitles appear or disappear in the third or fifth field,
The majority decision unit 58 determines that the field is a moving image field. Accordingly, the telecine judging unit 59 judges that the video signal is not a telecine video signal although it is originally a telecine video signal because there is no still image field once in every five fields.
2 will be output.

If it is not possible to correctly determine that the video signal is a telecine video signal, the original frame is accurately restored when the video signal converted to the interlaced scanning signal by the 2-3 pull-down method is converted to the sequential scanning signal. Image quality degradation such as degradation of resolution and jagged oblique wide area components. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a video signal in which subtitles representing characters of a movie or the like are inserted on a telecine video signal converted by a 2-3 pull-down method is input. A telecine video signal detection device capable of accurately determining whether or not an input video signal is a telecine video signal regardless of where and at which timing a caption is inserted. Aim.

[0012]

SUMMARY OF THE INVENTION A telecine video signal detecting apparatus according to the present invention calculates a difference between an input video signal and an output signal of a one-frame delay device for delaying an input video signal by one frame. A subtractor, an absolute value device for calculating the absolute value of the output value of the subtractor, and a pixel as a still pixel if the output value of the absolute value device is smaller than a threshold, and a moving pixel if the output value of the absolute value device is larger than the threshold value A comparator that outputs a binarized value corresponding to the determination result, a statistical processor that accumulates and outputs the output of the comparator over one field, and outputs a predetermined value. The majority device decides whether the field is a still image field or a moving image field depending on whether the value exceeds the number of moving pixels, and the output of the majority device repeats the still image field and the moving image field according to a predetermined rule. On whether it is the input video signal 2
And a telecine judging unit for judging whether the video signal is a telecine video signal converted by the -3 pull-down method or not.

[0013] Also, a telecine video signal detecting device according to the present invention includes a one-frame delay unit for delaying an input video signal by one frame, and a first luminance for detecting a pixel having a value equal to or higher than a predetermined luminance in the input video signal. Level detector and 1
A second luminance level detector for detecting a pixel having a value equal to or higher than a predetermined luminance in an output signal of the frame delay unit;
And an OR operator for summing the output of the luminance level detector and the output of the second luminance level detector.
A first switch that replaces all the values of the pixels obtained by the R operator with a predetermined fixed value; and outputs the values of all the pixels obtained by the OR operator in the output signal of the one-frame delay unit to the predetermined fixed value. A second switch, a subtractor for obtaining a difference between an output signal of the first switch and an output signal of the second switch, an absolute value calculator for obtaining an absolute value of an output value of the subtractor, If the output value of the device is smaller than the threshold value, the pixel is determined as a still pixel, and if the output value of the absolute value device is larger than the threshold value, the pixel is determined as a moving pixel, and a comparator that outputs a binarized value corresponding to the determination result; A statistical processor that accumulates and outputs the output of the comparator over one field and outputs whether the field is a still image field or a moving image field depending on whether the output value of the statistical processor is a value corresponding to the number of moving pixels 0 Majority voter and majority voter A telecine judging device for judging whether or not the input video signal is a telecine video signal converted by the 2-3 pull-down method, based on whether or not the output repeats a still image field and a moving image field according to a predetermined rule; Things.

[0014] Also, a telecine video signal detecting device according to the present invention includes a one-frame delay unit for delaying an input video signal by one frame, a subtractor for obtaining a difference between the input video signal and an output signal of the one-frame delay unit, An absolute value calculator for calculating an absolute value of an output value of the subtractor; a first luminance level detector for detecting a pixel having a value equal to or higher than a predetermined luminance in the input video signal; A second luminance level detector for detecting a pixel having a value equal to or higher than the luminance, an OR operator for summing an output of the first luminance level detector and an output of the second luminance level detector, and an absolute value calculator A switch that replaces all the values of the pixels obtained by the OR operation unit with 0 in the output signal of the pixel, a pixel if the output value of the switch is smaller than the threshold value, the pixel is a static pixel, Movement A comparator that outputs a binarized value corresponding to the judgment result, a statistical processor that accumulates and outputs the output of the comparator over one field, and an output value of the statistical processor Is a value corresponding to the number of moving pixels 0, and whether the field is a still image field or a moving image field, and whether the output of the majority device repeats the still image field and the moving image field according to a predetermined rule And a telecine judging device for judging whether or not the input video signal is a telecine video signal converted by the 2-3 pull-down method.

Further, the OR operation unit of the telecine video signal detecting device according to the present invention further includes a space expander for expanding the output signal in the horizontal and vertical directions, respectively.

Also, a telecine video signal detection device according to the present invention includes a one-frame delay unit for delaying an input video signal by one frame, a subtractor for obtaining a difference between the input video signal and an output signal of the one-frame delay unit, An absolute value device for calculating the absolute value of the output value of the subtractor, and if the output value of the absolute value device is smaller than the threshold value, the pixel is determined as a still pixel, and if the output value of the absolute value device is greater than the threshold value, it is determined as a moving pixel. A comparator for outputting a binarized value corresponding to the result;
A statistical processor that accumulates and outputs between fields,
A majority voter which determines whether the output value of the statistical processor is a value corresponding to the number of moving pixels 0 is a still image field or a moving image field. A telecine judging device for judging whether or not the input video signal is a telecine video signal converted by the 2-3 pull-down method based on whether or not the field is repeated; and a telecine judging device, wherein the input video signal is not a telecine video signal. The result of the continuous determination is counted, and it is determined whether the input video signal is a telecine video signal converted by the 2-3 pull-down method or not based on whether the count number is larger or smaller than a predetermined value. And a hysteresis unit.

The majority decision device of the telecine video signal detecting device according to claims 2 to 5 of the present invention determines whether or not the output value of the statistical processor exceeds a value corresponding to a predetermined number of moving pixels.
It is determined whether the field is a still image field or a moving image field.

According to a first aspect of the present invention, there is provided a telecine video signal detecting device, wherein the telecine determining unit comprises:
The result of continuously judging that the input video signal is not a telecine video signal is counted, and the telecine video obtained by converting the input video signal by the 2-3 pull-down method is determined depending on whether the number of counts is larger or smaller than a predetermined value. It further includes a hysteresis unit for determining whether the signal is a signal or not.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments. It is to be noted that the same reference numerals in the respective drawings indicate that they are the same or equivalent. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a telecine video signal detection device according to Embodiment 1 of the present invention. In the figure, 11 is an input terminal of a video signal, 12 is an output terminal of a telecine determination signal, 13 is a one-frame delay unit,
14 is a subtractor, 15 is an absolute value unit, 16 is a comparator, 17 is a statistical processor, 18 is a majority decision unit, and 19 is a telecine decision unit.

In the standard television signal converted by the 2-3 pull-down method, the first frame of the cinema film corresponds to the first and second fields of the standard television signal, and the second frame of the cinema film. Assume that the frame corresponds to the third, fourth, and fifth fields of the standard television signal. Similarly, the third frame of the cinema film is in the sixth and seventh fields of the standard television signal, and the fourth frame of the cinema film is in the eighth, ninth and ninth fields of the standard television signal. In the tenth field, the converted standard television signal is used as an input video signal.

Next, the operation will be described. The video signal input from the input terminal 11 is converted by the one-frame
Delay by a frame (ie, two fields). Next, the difference between the input video signal and the output signal of the one-frame delay unit 13 is calculated by the subtractor 14. At this time, if the input video signal is a telecine video signal, for example, the third field and the fifth field or the eighth field and the tenth field are the same image due to the characteristic of the 2-3 pull-down method. Since the signal is a signal, the output of the subtractor 14 in the third field and the fifth field or the output of the subtractor 14 in the eighth field and the tenth field is an approximate value of 0 in all pixels. However, when there is a caption inserted after being converted into a signal sampled at 60 fields per second, the output of the subtractor 14 may not be an approximate value of 0 at the position where the caption is inserted.

The absolute value calculator 15 calculates and outputs the absolute value of the output of the subtractor 14. The comparator 16 determines that the pixel is a still pixel if the output value of the absolute value device 15 is smaller than a predetermined threshold, and determines that the pixel is a moving pixel if the output value is larger than the predetermined threshold.
The binarized value corresponding to the determination result is output. For example, a binarized value in which the value corresponding to a still pixel is “0” and the value corresponding to a moving pixel is “1” is output. The statistical processor 17 accumulates the values binarized by the comparator 16 as still pixels or moving pixels over one field and outputs the accumulated values. In this case, if all the pixels in one field accumulated by the statistical processor 17 are still pixels (that is, if the number of moving pixels is 0), the output value of the statistical processor 17 becomes “0” and even one If a moving picture element is included, a value corresponding to the number of moving pixels of “1” or more is output.

In the present embodiment, the majority ruler 18 determines whether the value obtained by the statistical processor 17 accumulating the output values from the comparator 16 for all pixels over one field is equal to or less than a predetermined value other than "0". In other words, when the number of moving pixels equal to or less than the predetermined number is included, it is estimated that there is a possibility that subtitles have been displayed or erased in that field, and the accumulated field is determined as a still image field. Also,
The majority decision unit 18 determines that the value obtained by the statistical processor 17 accumulating the output values from the comparator 16 for all the pixels over one field is equal to or greater than the predetermined value (that is, the number of moving pixels equal to or greater than the predetermined number is included). ), It is determined that a moving pixel other than the caption exists in the field, and the accumulated field is determined as a moving image field. That is, the majority decision unit 18 in the present embodiment determines whether the field is a still image field or a moving image field based on whether the output value of the statistical processor 17 exceeds a value corresponding to a predetermined number of moving pixels.

Due to the characteristics of the 2-3 pull-down system, the third field and the fifth field of the input video signal are common (ie, the same image signal), and the eighth field and the first field of the input video signal.
Since the field of 0 is common (that is, the same image signal), when the input video signal is a telecine video signal,
The majority voter 18 periodically determines once every five fields as a still image field. Telecine decision unit 19
When a still image field exists according to the predetermined rule (that is, a cycle of every five fields), the input terminal 11
Is determined as a telecine video signal, and the result is output to the output terminal 12. Otherwise, it is determined that the signal is not a telecine video signal, and the result is output to the output terminal 12.

As described above, in the telecine video signal detecting apparatus according to the present embodiment, the majority decision unit 18 determines in advance the number of moving pixels generated when subtitles are displayed or erased in a cumulative field that should be originally determined as a still image field. Whether the field is a still image field or a moving image field depends on whether the output value of the accrual (predicting) and statistical processor 17 exceeds a value corresponding to a predetermined number of moving images (that is, the number of predicted moving images). Is determined. Therefore, regardless of where and when the caption is inserted into the input video signal, when a telecine video signal is input from the input terminal 11, the telecine determination signal output terminal 12 is determined to be a telecine video signal. The result of the correct determination can be output.

Embodiment 2 FIG. In the above-described first embodiment, the majority decision unit 18 predicts in advance the number of moving pixels generated when subtitles are displayed or erased in the input video signal, and when the number of moving pixels equal to or less than a predetermined value is included, Although it is determined that the caption may have been displayed or erased, the accumulated field is determined to be a still image field. However, in the following Embodiment 2, the brightness level of the caption is predicted, and a signal having a predetermined brightness level or more is obtained. (I.e., pixel) is determined as a still image or a moving image field by regarding it as a subtitle. FIG. 2 shows Embodiment 2 of the present invention.
1 is a block diagram showing a configuration of a telecine video signal detection device according to the first embodiment. In the figure, 20 is a first luminance level detector, 21 is a second luminance level detector, 22 is an OR operator, 23 is a first switch, 24 is a second switch,
Reference numeral 8 denotes a majority voter. The majority unit 28 has the same function as the majority unit 58 in the conventional device shown in FIG. In the drawing, the same reference numerals as those shown in FIG. 1 indicate the same or corresponding components, respectively.

Next, the operation will be described. The video signal input from the input terminal 11 is converted by the one-frame
Delay by a frame (ie, two fields). Next, since the subtitle inserted in the input video signal often has a higher luminance level than the original video signal, the first luminance level detector 20 determines a pixel having a higher luminance level equal to or higher than a predetermined threshold value. And the position of the pixel is detected.
Similarly, the second luminance level detector 21 regards a pixel having a high luminance level equal to or higher than a predetermined threshold in the output signal of the one-frame delay unit 13 as a caption, and detects the position of the pixel. The OR operation unit 22 includes the first luminance level detector 2
The sum of the output of 0 and the output of the second luminance level detector 21 is calculated. As a result, it is possible to detect all the positions of the pixels determined to have a high luminance level equal to or higher than the predetermined threshold value in either the input video signal or the output signal of the one-frame delay unit 13.

The first switch 23 changes the luminance level at the position of the pixel output from the OR operator 22 in the input video signal to a preset fixed value.
Similarly, the second switch 23 is connected to the one-frame delay unit 13
In the output signal of (1), the luminance level at the position of the pixel output by the OR operation unit 22 is changed to the previously set fixed value. That is, in any one of the input video signal and the output signal of the one-frame delay unit 13, only the luminance level at the pixel position determined to have a high luminance level equal to or higher than the predetermined threshold is changed to a preset and fixed value. You. The subtractor calculates the difference between the output signal of the first switch and the output signal of the second switch. At this time, in either the input video signal or the output signal of the one-frame delay unit 13, the subtracter 14 at the position of the pixel determined to have a high luminance level equal to or higher than a predetermined threshold value
Becomes zero.

The absolute value device 15 calculates and outputs the absolute value of the output of the subtractor 14. The comparator 16 determines that the pixel is a still pixel if the output value of the absolute value device 15 is smaller than a predetermined threshold, and determines that the pixel is a moving pixel if the output value is larger than the predetermined threshold.
The binarized value corresponding to the determination result is output. For example, a binarized value in which the value corresponding to a still pixel is “0” and the value corresponding to a moving pixel is “1” is output. The statistical processor 17 accumulates the values binarized by the comparator 16 as still pixels or moving pixels over one field and outputs the accumulated values. In this case, if all the pixels in one field accumulated by the statistical processor 17 are still pixels (that is, if the number of moving pixels is 0), the output value of the statistical processor 17 becomes “0” and even one If a moving picture element is included, a value of “1” or more corresponding to the number of moving pixels is output.

Then, the majority decision device 2 in the present embodiment
8 indicates that if the output value from the statistical processor 17 is a value corresponding to the number of moving pixels 0 (that is, the output value is “0”), the field is determined to be a still image field; If the value is “1” or more), the field is determined to be a moving image field. That is, the majority decision unit 28 in the present embodiment determines whether the field is a still image field or a moving image field based on whether or not the output value of the statistical processor 17 is a value corresponding to the number of moving pixels 0. When a still image field exists according to a predetermined rule (that is, once every five fields), the telecine determining unit 19 determines that the video signal input from the input terminal 11 is a telecine video signal and outputs the result. Output to terminal 12. Otherwise, it is determined that the signal is not a telecine video signal, and the result is output to the output terminal 12.

As described above, in the telecine video signal detecting apparatus according to the present embodiment, the position of a pixel having a high luminance level, which is a characteristic of a caption, is detected in advance, and the position is determined by either the input video signal or the one-frame delay signal. For pixels, the luminance levels of both the input video signal and the one-frame delay signal are set to fixed values. As a result, the output signal of the subtractor 14 at the position of the moving pixel generated when the caption is displayed or erased becomes 0, and the majority decision unit 28 can surely find (detect) the still image field. Accordingly, when a telecine video signal is input from the input terminal 11, regardless of where and at what timing the caption is inserted, the telecine determination signal output terminal 12 correctly determines that the video is a telecine video signal. Can be output.

Embodiment 3 FIG. FIG. 3 is a block diagram showing a configuration of a telecine video signal detection device according to Embodiment 3 of the present invention. In the figure, the same reference numerals as those shown in FIG. 2 indicate the same or corresponding parts, respectively, and 25 which does not overlap is a space expander. The telecine video signal detection device according to the third embodiment has the same configuration as that of the second embodiment, except that the OR operator 22 and the first switch 23 and the second switch 24
A space enlarger 25 is further provided.

Next, the operation will be described. As in the second embodiment, the OR calculator 22 calculates the sum of the output of the first luminance level detector 20 and the output of the second luminance level detector 21. The space expander 25 is an output of the OR operator 22.
The position of a pixel determined to have a high luminance level equal to or higher than a predetermined threshold value in either the input video signal or the one-frame delay signal is spatially expanded in the horizontal or vertical direction. For example, all the left and right pixels, upper and lower pixels, and oblique pixels of the pixel determined to have a high luminance level are pixels having a high luminance level equal to or higher than a predetermined threshold. As a result, the position of the pixel determined to be a caption is enlarged to the periphery, and the first switch 23 sets in advance the luminance level of the position of the pixel output from the space expander 25 in the input video signal. Change to a fixed value. Similarly, the second switch 23
In the output signal of the one-frame delay unit 13, the spatial expander 2
The luminance levels at the positions of the pixels output in step 5 are all changed to fixed values.

As described above, in the telecine video signal detecting apparatus according to the present embodiment, the position of a pixel having a high luminance level is detected in advance, and in the input video signal and the one-frame delay signal, not only the corresponding pixel but also its surroundings are detected. , The luminance levels of both the input video signal and the one-frame delay signal are set to fixed values. Accordingly, in addition to the effect of the telecine video signal detection device according to the second embodiment, the position of a pixel determined to be a caption due to a clock phase shift, a jitter, or the like is changed by one pixel between the input video signal and the one-frame delay signal. Even if a deviation of less than 1 occurs, the luminance level of a pixel corresponding to a subtitle can be correctly changed to a fixed value.

Embodiment 4 FIG. In the telecine video signal detection device according to the second embodiment described above, before the subtractor 14 calculates the difference between the input video signal and the one-frame delay signal, the luminance level of the pixel corresponding to the caption is changed by two switches (that is, two switches).
Although the fixed value is changed (replaced) using the first switch 23 and the second switch 24), the present embodiment can be realized with a simpler circuit scale by changing the position where the switch is provided. . FIG. 4 is a block diagram showing a configuration of a telecine video signal detection device according to the fourth embodiment. In the figure, reference numeral 26 denotes a switch, and the same reference numerals as those shown in FIG. 2 indicate the same or corresponding parts.

Next, the operation will be described. The video signal input from the input terminal 11 is converted by the one-frame
Delay by a frame (ie, two fields). Next, the difference between the input video signal and the output signal of the one-frame delay unit 13 is calculated by the subtractor 14. At this time, the above 2-3
When the input video signal is a telecine video signal due to the feature of the pull-down method, the output of the subtractor 14 of the third field and the fifth field or the output of the eighth field and the tenth field is all pixels. Is an approximate value of 0. However, if there is a subtitle to be inserted after being converted into a signal sampled at 60 fields per second, the subtracter 14 is provided at the position where the subtitle is inserted.
The output may not be an approximate value of zero. Absolute value 1
Numeral 5 calculates and outputs the absolute value of the output of the subtractor 14.

Since a subtitle inserted in an input video signal often has a higher luminance level than the original video signal, the first luminance level detector 20 detects pixels having a higher luminance level than a predetermined threshold value. Regarding the caption, the position of the pixel is detected. Similarly, the second luminance level detector 21
In the output signal of the one-frame delay unit 13, a pixel having a high luminance level equal to or higher than a predetermined threshold value is regarded as a caption, and the position of the pixel is detected. The OR operation unit 22 outputs the output of the first luminance level detector 20 and the second luminance level detector 21
Sum the outputs. Thereby, the input video signal and 1
All the positions of the pixels determined to have a high luminance level equal to or higher than a predetermined threshold value in any of the output signals of the frame delay unit 13 can be detected.

The switch 26 changes all the absolute values of the positions of the pixels output by the OR calculator 22 to 0 with respect to the signal output from the absolute value device 15. If the absolute value output from the switch 26 is smaller than the threshold value, the comparator 16 determines that the pixel is a still pixel, and if the absolute value is larger than the threshold value, it determines a moving pixel, and outputs a binarized value corresponding to the determination result. For example, a binarized value in which the value corresponding to a still pixel is “0” and the value corresponding to a moving pixel is “1” is output. OR operator 2
Since the absolute value of the position of the pixel output at 2 has been changed to 0, that pixel is determined to be a still pixel. The values binarized by the comparator 16 as still pixels or moving pixels are accumulated by the statistical processor 17 over one field.

The majority decision unit 28 is provided with the statistical processor 17
If the output value from is a value corresponding to the number of moving pixels 0 (ie, the output value “0”), the field is determined to be a still image field, otherwise (ie, if the output value is “1” or more). ), The field is determined to be a moving image field. That is, the majority decision unit 28 determines whether the field is a still image field or a moving image field based on whether the output value of the statistical processor 17 is a value corresponding to the number of moving pixels 0. When a still image field exists according to a predetermined rule (ie, once every five fields), the telecine determining unit 19 determines that the video signal input from the input terminal 11 is a telecine video signal, and outputs the result. Output to terminal 12. Otherwise, it is determined that the signal is not a telecine video signal, and the result is output to the output terminal 12.

As described above, in the telecine video signal detecting apparatus according to the present embodiment, the position of a pixel having a high luminance level is detected in advance as a feature of the subtitle, and the subtitle is detected using either the input video signal or the one-frame delay signal. With respect to the corresponding pixel, the absolute value after taking the difference between the input video signal and the one-frame delay signal is set to 0 using one switch 26. Thus, with a simpler configuration than in the case of the second embodiment, the decision of the comparator 16 at the position of the moving pixel that occurs when the subtitle is displayed or erased becomes a still pixel, and the majority decision unit 28 Is surely found (detected). Accordingly, when a telecine video signal is input from the input terminal 11, regardless of where and at what timing the caption is inserted, the telecine determination signal output terminal 12 correctly determines that the video is a telecine video signal. And can be realized with a smaller circuit configuration than in the second embodiment.

Embodiment 5 FIG. FIG. 5 is a block diagram showing a configuration of the telecine video signal detection device according to the fifth embodiment. In the figure, the same reference numerals as those shown in FIG. 4 denote the same or corresponding components, and a non-overlapping 25 is a space expander. The telecine video signal detection device according to the fifth embodiment is characterized in that a space expander 25 is further provided between the OR operator 22 and the switch 26 in the configuration of the fourth embodiment.

Next, the operation will be described. Similarly to the telecine video signal detection device according to the fourth embodiment described above, the OR operation unit 22 outputs the output of the first luminance level detector 20 and the second
Of the outputs of the luminance level detectors 21 of FIG. The space expander 25 determines the position of a pixel determined to have a high luminance level equal to or higher than a predetermined threshold value in either the input video signal or the one-frame delay signal, which is the output of the OR operation unit 22, in the horizontal or vertical direction. To expand the space. For example, left and right pixels, upper and lower pixels of a pixel determined to have a high luminance level,
All the oblique pixels are pixels having a high luminance level equal to or higher than a predetermined threshold. As a result, the position of the pixel determined to be a caption is expanded to the periphery, and the switch 26 sets the absolute value of the position of the pixel output from the space expander 25 to 0 in response to the signal output from the absolute value device 15. Change (replace).

As described above, in the telecine video signal detecting apparatus according to the fifth embodiment, the position of a pixel having a high luminance level is detected in advance, and not only the pixel corresponding to either the input video signal or the one-frame delay signal but also the corresponding pixel is detected. The signals output from the absolute value device 15 are changed (replaced) to 0 for the peripheral pixels. Accordingly, in addition to the effect of the telecine video signal detection device according to the fourth embodiment, the position of a pixel determined to be a caption due to a clock phase shift, jitter, or the like is changed by one pixel between the input video signal and the one-frame delay signal. Even if a deviation of less than 1 occurs, the luminance level of a pixel corresponding to a subtitle can be correctly changed to a fixed value. Further, only one switch is used, and it can be realized with a smaller circuit configuration than in the case of the third embodiment.

Embodiment 6 FIG. FIG. 6 is a block diagram showing a configuration of a telecine video signal detection device according to the sixth embodiment. In the figure, 11 is an input terminal of a video signal, 12 is an output terminal of a telecine determination signal, 13 is a one-frame delay unit, 14 is a subtractor, 15 is an absolute value unit, 16 is a comparator, 1
7 is a statistical processor, 28 is a majority decision device, 19 is a telecine judging device, and 27 is a hysteresis device. In the present embodiment,
In the telecine video signal detecting device according to the first embodiment, the majority device 28 is the majority device 5 of the conventional device shown in FIG.
8 is characterized by using a device having the same function as that of FIG. 8 and further including a hysteresis unit in the output unit.

As described in the first embodiment, 2
In the standard television signal converted by the -3 pull-down method, the first frame of the cinema film corresponds to the first field and the second field of the standard television signal, and the second frame of the cinema film corresponds to the standard television signal. These correspond to the third, fourth, and fifth fields of the John signal. Similarly, the third frame of the cinema film is in the sixth and seventh fields of the standard television signal, and the fourth frame of the cinema film is in the eighth, ninth and ninth fields of the standard television signal. The standard television signal corresponding to the tenth field and thus converted is input to the input terminal 11.

Next, the operation will be described. The video signal input from the input terminal 11 is converted by the one-frame
Delay by a frame (ie, two fields). Next, the difference between the input video signal and the output signal of the one-frame delay unit 13 is calculated by the subtractor 14. The absolute value calculator 15 calculates and outputs the absolute value of the output of the subtractor 14. Comparator 16
If the output value of the absolute value device 15 is smaller than the threshold value, the pixel is determined as a still pixel, and if the output value is larger, the pixel is determined as a moving pixel, and a binarized value corresponding to the determination result is output. For example, a binarized value in which the value corresponding to a still pixel is “0” and the value corresponding to a moving pixel is “1” is output.

The values binarized by the comparator 16 as still pixels or moving pixels are accumulated by the statistical processor 17 over one field. And majority voter 28
If the output value from the statistical processor 17 is a value corresponding to the number of moving pixels 0 (ie, the output value “0”), the field is determined to be a still image field, otherwise (ie, the output value “ If it is 1 "or more), the field is determined to be a moving image field. That is, the majority decision unit 28 determines whether the field is a still image field or a moving image field based on whether the output value of the statistical processor 17 is a value corresponding to the number of moving pixels 0.

The telecine judging unit 19 judges that the input video signal is a telecine video signal when a still picture field exists once every five fields, and otherwise judges that it is not a telecine video signal. , To the hysteresis unit 27. In the input video signal converted by the 2-3 pull-down method, the third field and the fifth
Are the same signal (that is, the same image), while the field in which the caption is displayed or the field in which the caption is erased matches the third field or the fifth field, the telecine determination is made. The device 19 determines that the image is not a telecine image. However, as a feature of the caption, the caption displayed in the third field or the fifth field is not erased in the eighth field or the tenth field. Conversely, subtitles deleted in the third field or the fifth field may be displayed in the eighth field or the tenth field.

FIG. 7 shows this state. A1, A in FIG.
2 .... D4 and D5 indicate respective field numbers.
Also, circles in the figure represent each scanning line, solid and dotted white circles indicate subtitles, hatched circles and black circles indicate images. The telecine determiner 19 determines the input video signal as a telecine video signal because there are still image fields in the A3 field and the A5 field. However, since subtitles are deleted between the B3 field and the B5 field, a still image field that should exist once in five fields is determined as a moving image field. As a result, the hysteresis unit 27 sets the counter that counts that the input video signal is not a telecine video signal to one.

Similarly, since a new subtitle is displayed between the C3 field and the C5 field, it is determined that the subtitle is a moving picture field, and the hysteresis unit 27 sets the counter for counting that the input video signal is not a telecine video signal to 2. However, it is impossible for the subtitle to be further erased between the D3 field and the D5 field as a characteristic of the subtitle, so that the subtitle is determined as a still image field. Accordingly, the hysteresis unit 27 returns the counter that counts that the input video signal is not the telecine video signal to 0. When the telecine judging unit 19 judges that the input video signal is a telecine video signal, the hysteresis unit 27 sets the counter to 0, and the number of still image fields that should be present once in every five fields is up to two. Increase the value of the counter to account for the potential for a video field.

Further, when the value of the counter becomes 3 or more,
It is determined that the input video signal is not a telecine video signal, and the result is output to the output terminal 12. Otherwise, it is determined to be a telecine video signal, and the result is output to the output terminal 12. As described above, in the telecine video signal detection device according to the present embodiment, when the caption is displayed or erased in the cumulative field that should be originally determined as a still image field, the hysteresis unit 27 determines that the video field is determined as a moving image field. The telecine video signal is determined in anticipation that it may appear consecutively. Accordingly, when a telecine video signal is input from the input terminal 11, regardless of where and at what timing the caption is inserted, the telecine determination signal output terminal 12 correctly determines that the video is a telecine video signal. Can be output.

In the telecine video signal detecting device having the configuration shown in the second to sixth embodiments, the majority voting device 18 is used in place of the majority device 28, so that the telecine video signal is obtained. Doing it twice (duplicate)
This makes it possible to realize a telecine video signal detection device that can make a determination with higher reliability. Further, by further providing the hysteresis unit 27 shown in the sixth embodiment at the output section of the telecine video signal detection device having the configuration shown in the first to fifth embodiments, it is possible to similarly determine that the signal is a telecine video signal. (Redundant), it is possible to realize a telecine video signal detection device capable of making a more reliable determination.

[0053]

According to the telecine video signal detecting device of the present invention, a one-frame delay unit for delaying an input video signal by one frame, and a subtractor for obtaining a difference between the input video signal and an output signal of the one-frame delay unit are provided. An absolute value device that calculates the absolute value of the output value of the subtractor, and if the output value of the absolute value device is smaller than a threshold value, the pixel is determined as a still pixel.If the output value of the absolute value device is larger than the threshold value, the pixel is determined as a moving pixel. 2 corresponding to the judgment result
A comparator for outputting a digitized value, a statistical processor for accumulating and outputting the output of the comparator over one field, and an output value of the statistical processor exceeding a value corresponding to a predetermined number of moving pixels Whether the field is a still image field or a moving image field, and whether or not the output of the majority device repeats the still image field and the moving image field according to a predetermined rule. And a telecine judging device for judging whether or not the telecine video signal has been converted by the -3 pull-down system. Therefore, the number of moving pixels generated when subtitles are displayed or deleted in the input telecine video signal is estimated in advance. The majority decision unit determines whether the output is a still image field or a moving image field by determining whether the output value of the statistical processor exceeds the value corresponding to the estimated predetermined number of moving pixels. It becomes possible, the subtitles anywhere, whether inserted at any time, if the telecine video signal is inputted from the input terminal can be correctly determined to be a telecine video signal.

Further, according to the telecine video signal detecting apparatus of the present invention, the one-frame delay device for delaying the input video signal by one frame, and the first device for detecting a pixel having a value equal to or higher than a predetermined luminance in the input video signal. A brightness level detector,
A second luminance level detector for detecting a pixel having a value equal to or higher than a predetermined luminance in the output signal of the one-frame delay unit, and a sum of an output of the first luminance level detector and an output of the second luminance level detector , A first switch that replaces all the values of the pixels obtained by the OR calculator in the input video signal with predetermined fixed values, and an OR calculator that obtains the output signal of the one-frame delay unit. A second switch that replaces the values of all the pixels with the predetermined fixed value, a subtractor that takes the difference between the output signal of the first switch and the output signal of the second switch, An absolute value calculator for determining an absolute value, a pixel is determined as a still pixel if the output value of the absolute value device is smaller than a threshold, and a moving pixel if the output value of the absolute value device is larger than the threshold value. Comparator that outputs a digitized value A statistical processor for accumulating and outputting the output of the comparator over one field, and determining whether the output value of the statistical processor is a value corresponding to the number of moving pixels 0, whether the field is a still image field or a moving image field. Whether the input video signal is a telecine video signal converted by a 2-3 pull-down method or not depending on whether the majority device determines whether or not the output of the majority device repeats a still image field and a moving image field according to a predetermined rule And a telecine judging device for judging whether or not a pixel having a high luminance level, which is a characteristic of a caption, is detected in advance. The luminance level of both the signal and the one-frame delay signal is set to a fixed value, and a subtractor at the position of a moving pixel generated when subtitles are displayed or erased The output becomes possible to zero, Voter can reliably detect a still image field. Therefore, a result of correctly determining that a subtitle is a telecine video signal can be output irrespective of where and at which timing a caption is inserted.

According to the telecine video signal detecting device of the present invention, a one-frame delay unit for delaying an input video signal by one frame, and a subtractor for obtaining a difference between the input video signal and an output signal of the one-frame delay unit are provided. An absolute value calculator for calculating an absolute value of an output value of the subtractor, a first luminance level detector for detecting a pixel having a value equal to or higher than a predetermined luminance in the input video signal, and a predetermined value for an output signal of the one-frame delay unit. A second luminance level detector for detecting a pixel having a value equal to or greater than the luminance of the first luminance level detector; an OR operator for summing an output of the first luminance level detector and an output of the second luminance level detector; A switch that replaces all the values of the pixels obtained by the OR operation unit with 0 in the output signal of the hand device, a pixel if the output value of the switch is smaller than the threshold, the pixel is a still pixel, and the output value of the absolute value device is larger than the threshold Ba A comparator that determines a pixel and outputs a binarized value corresponding to the determination result, a statistical processor that accumulates and outputs the output of the comparator over one field, and an output value of the statistical processor Is a value corresponding to the number of moving pixels 0, and whether the field is a still image field or a moving image field, and whether the output of the majority device repeats the still image field and the moving image field according to a predetermined rule And a telecine judging device for judging whether or not the input video signal is a telecine video signal converted by the 2-3 pull-down method. For the pixel corresponding to either the input video signal or the one-frame delayed signal, the absolute value of the pixel after calculating the difference between the input video signal and the one-frame delayed signal is switched. By zero with Ji, determination of the comparator at the position of the moving element that occurs when the subtitle is displayed or erased also becomes stationary pixel, Voter reliably discover still image field (detection)
It is possible to do. Therefore, when the telecine video signal is input from the input terminal regardless of where the subtitles are inserted and at what timing, it is a telecine video signal despite the simple configuration using only one switch. Can be reliably determined.

Further, since the OR operator of the telecine video signal detecting device according to the present invention further includes a space expander for expanding the output signal in the horizontal and vertical directions, respectively.
The position of a pixel having a high luminance level is detected in advance, and the luminance of both the input video signal and the one-frame delay signal is detected not only for the corresponding pixel in the input video signal and the one-frame delay signal but also for the surrounding pixels. It is possible to set the level to a fixed value, and even if the position of a pixel determined to be a caption shifts by less than one pixel between the input video signal and the one-frame delay signal due to clock phase shift or jitter, etc. It is possible to correctly change the luminance level of the pixel corresponding to the caption to a fixed value. Therefore, regardless of where and when the subtitles are inserted, when a telecine video signal is input from the input terminal,
It is possible to more reliably determine that the signal is a telecine video signal with higher accuracy.

Further, the telecine video signal detecting device according to the present invention comprises: a one-frame delay unit for delaying an input video signal by one frame; a subtractor for obtaining a difference between the input video signal and an output signal of the one-frame delay unit; An absolute value device for calculating the absolute value of the output value of the subtractor, and if the output value of the absolute value device is smaller than the threshold value, the pixel is determined as a still pixel, and if the output value of the absolute value device is greater than the threshold value, it is determined as a moving pixel. A comparator for outputting a binarized value corresponding to the result;
A statistical processor that accumulates and outputs between fields,
A majority voter which determines whether the output value of the statistical processor is a value corresponding to the number of moving pixels 0 is a still image field or a moving image field. A telecine judging device for judging whether or not the input video signal is a telecine video signal converted by the 2-3 pull-down method based on whether or not the field is repeated; and a telecine judging device, wherein the input video signal is not a telecine video signal. The result of the continuous determination is counted, and it is determined whether the input video signal is a telecine video signal converted by the 2-3 pull-down method or not based on whether the count number is larger or smaller than a predetermined value. Since a hysteresis unit is provided, the hysteresis unit is used to determine whether or not a subtitle is to be determined as a still image field when subtitles are displayed or erased. Rudo is in anticipation that may appear consecutively to be determined as a moving image field, it is possible to determine a telecine video signal. Therefore, regardless of where and at what timing a caption is inserted, when a telecine video signal is input from the input terminal, it can be correctly determined that the video signal is a telecine video signal.

The majority decision device of the telecine video signal detecting device according to claims 2 to 5 of the present invention determines whether or not the output value of the statistical processor exceeds a value corresponding to a predetermined number of moving pixels.
Since it is determined whether the field is a still image field or a moving image field, it is possible to double determine that the field is a telecine video signal, and it is possible to determine with higher reliability that the signal is a telecine video signal.

Further, in the telecine video signal detecting device according to claims 1 to 4 of the present invention, the telecine judging device comprises:
The result of continuously judging that the input video signal is not a telecine video signal is counted, and the telecine video obtained by converting the input video signal by the 2-3 pull-down method is determined depending on whether the number of counts is larger or smaller than a predetermined value. Since a hysteresis unit for determining whether the signal is a signal or not is further provided, it is possible to double determine that the signal is a telecine video signal, and it is possible to more reliably determine that the signal is a telecine video signal.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a telecine video signal detection device according to a first embodiment.

FIG. 2 is a block diagram showing a configuration of a telecine video signal detection device according to a second embodiment.

FIG. 3 is a block diagram showing a configuration of a telecine video signal detection device according to a third embodiment.

FIG. 4 is a block diagram showing a configuration of a telecine video signal detection device according to a fourth embodiment.

FIG. 5 is a block diagram showing a configuration of a telecine video signal detection device according to a fifth embodiment.

FIG. 6 is a block diagram showing a configuration of a telecine video signal detection device according to a sixth embodiment.

FIG. 7 is a diagram for explaining an example of a case where subtitles are displayed or deleted in a telecine video signal converted by a 2-3 pull-down method.

FIG. 8 is a block diagram showing a configuration of a conventional telecine video signal detection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Video signal input terminal 12 Telecine determination signal output terminal 13 1 frame delay unit 14 Subtractor 15 Absolute value unit 16 Comparator 17 Statistical processor 18 Majority decision device 19 Telecine determination unit 20 1st brightness level detector 21 2nd brightness Level detector 22 OR operator 23 First switch 24 Second switch 25 Spatial expander 26 Switch 27 Hysteresis unit 28 Majority detector

Claims (7)

[Claims] 1. A method for delaying an input video signal by one frame
A frame delay unit; a subtractor that calculates a difference between the input video signal and the output signal of the one-frame delay unit; an absolute value unit that calculates an absolute value of an output value of the subtractor; an output value of the absolute value device Is smaller than a threshold, the pixel is determined as a still pixel, and if the output value of the absolute value device is larger than the threshold, the pixel is determined as a moving pixel, and a comparator that outputs a binarized value corresponding to the determination result is provided. A statistical processor that accumulates and outputs the output of the device over one field and outputs a still image field based on whether the output value of the statistical processor exceeds a value corresponding to a predetermined number of moving pixels. A majority voter that determines whether the input video signal is a moving image field, and whether or not the output of the majority voter repeats a still image field and a moving image field according to a predetermined rule. Telecine video signal detector being characterized in that a telecine decision unit that determines or not whether cine video signal. 2. A method for delaying an input video signal by one frame.
A frame delay unit, a first luminance level detector that detects a pixel having a value equal to or higher than a predetermined luminance in the input video signal, and a pixel having a value equal to or higher than a predetermined luminance in the output signal of the one-frame delay unit. A second luminance level detector to detect, an OR operator for summing an output of the first luminance level detector and an output of the second luminance level detector, and the OR operator for the input video signal A first switch that replaces all the values of the pixels obtained in the above with a predetermined fixed value; and, in the output signal of the one-frame delay unit, the values of all the pixels obtained by the OR operation unit to the predetermined fixed value. A second switch to be replaced; a subtractor that takes a difference between an output signal of the first switch and an output signal of the second switch; an absolute value device that obtains an absolute value of an output value of the subtractor; Absolute value If the output value of the comparator is smaller than a threshold value, the pixel is determined as a still pixel. If the output value of the absolute value device is greater than the threshold value, the pixel is determined as a moving pixel, and a comparator that outputs a binarized value corresponding to the determination result. A statistical processor for accumulating and outputting the output of the comparator over one field, and determining whether or not the output value of the statistical processor is a value corresponding to the number of moving pixels 0, wherein the field is a still image field And a telecine video in which an input video signal is converted by a 2-3 pull-down method based on whether or not an output of the majority voter repeats a still image field and a video field according to a predetermined rule. A telecine video signal detection device, comprising: a telecine determination unit that determines whether a signal is a signal or not. 3. A method for delaying an input video signal by one frame.
A frame delay unit; a subtractor that calculates a difference between the input video signal and the output signal of the one-frame delay unit; an absolute value unit that calculates an absolute value of an output value of the subtractor; A first luminance level detector that detects a pixel having a value equal to or higher than the luminance; a second luminance level detector that detects a pixel having a value equal to or higher than a predetermined luminance in an output signal of the one-frame delay unit; An OR operator for calculating the sum of the output of the first luminance level detector and the output of the second luminance level detector, and the values of all the pixels obtained by the OR operator in the output signal of the absolute value device And a switch that replaces 0 with 0. If the output value of the switch is smaller than a threshold value, the pixel is determined as a still pixel, and if the output value of the absolute value device is larger than the threshold value, the pixel is determined as a moving pixel. Transformed A comparator that outputs the calculated value, a statistical processor that accumulates and outputs the output of the comparator over one field, and whether the output value of the statistical processor is a value corresponding to the number of moving pixels 0 And a majority voter for determining whether the field is a still image field or a moving image field; and determining whether an output of the majority voter repeats a still image field and a moving image field according to a predetermined rule. A telecine video signal detecting device, comprising: a telecine video signal converted by a pull-down method; 4. The telecine video signal detecting device according to claim 2, wherein the OR operator further comprises a space expander for expanding its output signal in the horizontal and vertical directions, respectively. . 5. An apparatus for delaying an input video signal by one frame.
A frame delay unit; a subtractor that calculates a difference between the input video signal and the output signal of the one-frame delay unit; an absolute value unit that calculates an absolute value of an output value of the subtractor; an output value of the absolute value device Is smaller than a threshold, the pixel is determined as a still pixel, and if the output value of the absolute value device is larger than the threshold, the pixel is determined as a moving pixel, and a comparator that outputs a binarized value corresponding to the determination result is provided. A statistical processor that accumulates and outputs the output of the device over one field, and determines whether the output value of the statistical processor is a value corresponding to the number of moving pixels 0, whether the field is a still image field or a moving image field. And a telecine video signal obtained by converting the input video signal by a 2-3 pull-down method, based on whether the output of the majority device repeats a still image field and a moving image field according to a predetermined rule. Or a telecine decision unit to determine not, the telecine decision unit is, the input video signal by counting the result of judgment in succession that it is not a telecine video signal,
And a hysteresis unit for judging whether the input video signal is a telecine video signal converted by a 2-3 pull-down system or not based on whether the count number is larger or smaller than a predetermined value. Signal detection device. 6. The majority decision unit determines whether the field is a still image field or a moving image field based on whether an output value of the statistical processor exceeds a value corresponding to a predetermined number of moving pixels. Item 6. The telecine video signal detection device according to any one of Items 2 to 5. 7. A telecine judging device counts the result of successively judging that the input video signal is not a telecine video signal, and determines whether the input video signal is 2 or not depending on whether the number of counts is larger or smaller than a predetermined value. 5. The apparatus according to claim 1, further comprising a hysteresis unit for judging whether the video signal is a telecine video signal converted by a -3 pull-down method.
The telecine video signal detection device according to any one of the above.