JP4049157B2 - Video signal processing device - Google Patents

Description

  The present invention relates to a chroma key technique which is one of digital video signal processing techniques, and more particularly to a video signal processing apparatus for outputting a chroma key video which is greatly related to the resolution of the video output in the chroma key technique.

  As one of technologies related to digital video production, there is a technology for converting video shot with a film or the like and video signals recorded with the same number of frames into various frame rates. This technique is known from Patent Document 1 and the like. In particular, a progressive video signal (hereinafter referred to as 24P video signal) system video composed of 24 frames / second is converted into a progressive video signal (hereinafter referred to as 60P video signal) system video composed of 60 frames / second and recorded. In this case, conversion using a conversion method called 2: 3 pull-down is generally used (hereinafter, conversion using the 2: 3 pull-down method is referred to as 2: 3 pull-down conversion).

  A frame rate conversion method for video signals will be described with reference to FIG. The above 60 frames / second is an accurate value of 59.94 frames / second in the current standard, but is described as 60 frames / second in this specification. Similarly, 29.97 frames / second is described as 30 frames / second.

  FIG. 10 is a timing chart when a 24P video signal is converted into a 60P video signal by the 2: 3 pull-down method. In FIG. 10, four consecutive frames of the 24P video signal are represented as A, B, C, and D, the frame A is continuously converted into frame numbers 1 and 2, and the frame B is converted into frame numbers 3, 4, 5 is continuously converted, frame C is continuously converted to frame numbers 6 and 7, and frame D is continuously converted to frame numbers 8, 9, and 10. In the 2: 3 pull-down method, the 24P video signal is converted into the 60P video signal method in units of 4 frames while adjusting the time axis. As described above, the 2: 3 pull-down method is a method in which one frame of the 24P video signal is converted to 2: 3: 2: 3... So as to correspond to two frames or three frames of the 60P video signal.

  On the other hand, in addition to the above technique, there is a chroma key technique as one of techniques related to digital video production. Hereinafter, the chroma key technique will be described with reference to FIG.

  FIG. 6 is a diagram illustrating a process of creating a composite image using the chroma key technique. In the chroma key technology, first, a component video 601 in which a subject is photographed using a specific color, in this case, blue (shaded portion of the component video 601) as a background is prepared. Only a blue signal that is the background color (hereinafter referred to as a B signal that is one of the color signals) is extracted to create a chroma key image 602 for separating the background and the subject. Then, the component video 601 and the chroma key video 602 are combined to create a subject video 603 in which only the subject is extracted. In the subject video 603, the part other than the subject, that is, the background part is transparent. Finally, the composite video 605 is obtained by superimposing the subject video 603 on the separately prepared background video 604. Such a chroma key composition technique is known in Patent Document 2 and the like.

  FIG. 9 is a block diagram of a conventional video signal processing apparatus for generating chroma key video. A conventional video signal processing apparatus 901 includes a camera unit 902 and a camera control unit 903, and incident light 904 is converted into RGB video composed of R, G, and B color signal components by an imaging unit 906 through a lens 905, The data is input to the digital processing unit 909 via the analog processing unit 907 and the A / D conversion unit 908. In the digital processing unit 909, the RGB video is converted into a luminance signal Y and color difference signals Cr and Cb (described later) constituting the component video. The component video is converted into a signal for transmission by a parallel / serial (P / S) conversion unit 910 and transmitted to the camera control device 903. The input signal is converted back to the original component video by the serial / parallel (S / P) converter 911 and enters the digital processor 912. Here, an RGB video is generated from the component video, and a chroma key video 915 is obtained via a chroma key processing unit 914. A component video 913 is separately output from the digital processing unit 912.

Here, the component video is a signal in which the luminance signal Y and the color difference signals Cr and Cb are generated from the RGB video by utilizing the fact that the human visual characteristic is insensitive to the color signal compared to the luminance signal. . When the NTSC RGB video is used as a component video, the relationship between the luminance signal and color difference signal and the RGB video is expressed by the following equation.
Y = 0.299R + 0.587G + 0.114B (Formula 1)
Cr = 0.713 × (R−Y)
= 0.500R-0.419G-0.081B (Formula 2)
Cb = 0.564 × (BY)
= −0.169R−0.331G + 0.500B (Formula 3)
Here, the frequency band of the luminance signal Y is the same as that of each color signal component constituting the RGB video, but the frequency band of the color difference signals Cr and Cb is half the frequency band of the luminance signal Y for output. That is, in these component videos, the ratio of the sampling frequency in the horizontal direction when converted into a digital signal is luminance signal Y: color difference signal Cr: color difference signal Cb = 4: 2: 2, and thus, such component video. Is called 4: 2: 2 video. The color difference signal Cr and the color difference signal Cb having a narrow frequency band have a lower resolution than the luminance signal Y having a wide frequency band.
JP 2003-284007 A JP 7-154819 A

  However, when chroma key composition is performed by a conventional video signal processing apparatus, there is a problem that the boundary between the subject video 603 and the background video 604 may become conspicuous. This is because the conventional technique generates chroma key video based on 4: 2: 2 video. That is, the RGB image generated again from the low-resolution 4: 2: 2 signal has a half resolution of 4: 2 with respect to the resolution of the original RGB image. Therefore, the resolution ratio of the luminance signal Y having the highest resolution among the signals constituting the background video 604 and the chroma key video 602 generated from the RGB video with half the resolution is still 4: 2, and the resolution is different. . As a result, the horizontal resolution of the boundary between the subject image and the background is lowered. In order to solve the problem that this boundary is conspicuous, the resolution of the signal constituting the chroma key image 602 is set to the same resolution as the luminance signal Y which is the signal having the highest resolution among the signals constituting the background image 604. There is a need.

  This is shown in FIG. 6 as follows. The enlarged video 606 of the high-resolution composite image is obtained by enlarging the boundary line between the subject and the background when the composite video 605 is generated using a chroma key video having the same resolution as the luminance signal Y. In the enlarged image 606 of the high-resolution composite image, the black pixel represents the subject portion, and the white pixel represents the background portion. When the subject video 603 is extracted from the component video 601 using the chroma key video 602 having the same resolution as the luminance signal Y of the background video 604, the subject video 603 is extracted along the actual boundary as in the enlarged video 606 of the high-resolution composite image. Since no rattling occurs and the resolution of the boundary portion does not decrease, a high-resolution composite image can be obtained.

  On the other hand, the enlarged image 607 of the low-resolution composite image is obtained by enlarging the boundary line between the subject and the background when the composite image 605 is generated using the chroma key video whose horizontal resolution is half that of the luminance signal Y. is there. In the enlarged image 607 of the low-resolution composite image, the black pixel represents the subject portion, and the white pixel represents the background portion. A gray broken line represents a true boundary line. When a subject video 603 is created by extracting a subject from the component video 601 using a chroma key video 602 having a lower resolution than the luminance signal Y of the background video 604, an actual boundary portion like the enlarged video 607 of the low-resolution composite image is used. There is a part that is extracted from the background beyond the background and a part that is extracted before the actual boundary, and the backlash is conspicuous in the boundary, so the resolution of the boundary part is lowered.

  In view of such problems, an object of the present invention is to provide a video signal processing apparatus capable of generating a chroma key video having the same high resolution as a luminance signal.

  In order to solve the above problems, the video signal processing apparatus of the present invention is configured to pull down a progressive video signal composed of N frames / second (N> 0) and to construct M frames / second (M ≧ 2 × N). A conversion means for converting a signal converted into a progressive video signal into an input video signal and converting R, G, and B color signal components of the input video signal into a component video including a luminance signal and a color difference signal, and the input A first selection means for selecting one of the R, G, and B color signal components of the video signal and outputting it as a chroma key video; and one of the component video and the chroma key signal. And a second selection means for selecting and outputting, wherein the second selection means comprises a progressive video signal composed of N frames / second composed of M frames / second. The chroma key is synchronized with a conversion control signal which is a signal indicating a timing at which the first frame is output when the same video is continuously output by a plurality of frames by being converted to a logistic video signal. The video is multiplexed with the luminance signal.

  According to the present invention, the color signal of the video is recorded as the chroma key video instead of the luminance signal of the second and subsequent frames when the same video continues for a plurality of frames by the conversion control signal when the frame rate is converted. Thus, this chroma key image can be taken out separately and used for chroma key composition, so that a composite image with higher resolution can be obtained.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Embodiment 1)
First, a schematic configuration of a video signal recording apparatus including the video signal processing apparatus of the present invention will be described. FIG. 1 is a configuration diagram of a video signal recording apparatus according to Embodiment 1 of the present invention. The 24P video signal synchronized with the 24 Hz synchronization signal 213 includes three color signal components of a 24P video signal R201, a 24P video signal G202, and a 24P video signal B203. These color signals are input from the input terminal and sent to the frame rate conversion means 113 together with the 24 Hz synchronization signal 213. The frame rate conversion means 113 converts the frame rate of these 24P video signals into 60 frames / second in synchronization with the 60 Hz synchronization signal 205 by the 2: 3 pull-down method, and generates 60P video signals R206, 60P video signals G207 and 60P. Output as video signal B208. The video signal processing apparatus 101 of the present invention converts the 60P video signal R206, 60P video signal G207, and 60P video signal B208 subjected to 2: 3 pull-down conversion into a component video of 60 frames / second and multiplexes chroma key video, The multiplexed signal 303, the color difference signal Cr304, and the color difference signal Cb305 are output. The recording unit 114 records the multiplexed signal 303, the color difference signal Cr304, and the color difference signal Cb305 output from the video signal processing apparatus 101 on a recording medium such as a magnetic tape, a magnetic disk, an optical disk, or a semiconductor memory.

  As described above, by providing the frame rate conversion means 113 in the front stage of the video signal processing apparatus 101 and the recording means 114 in the rear stage, the video signal recording apparatus of the present embodiment is configured. Note that the video signal processing apparatus may include the frame rate conversion unit 113.

  Next, the configuration of the video signal processing apparatus 101 will be described. The conversion means 102 receives the output of the frame rate conversion means 113 as input, converts these into component video, that is, a luminance signal Y209, a color difference signal Cr210, and a color difference signal Cb211 and outputs them. The first selection means 103 receives the output of the frame rate conversion means 113 as input, selects any one of the input signals selected by the switching control signal, and outputs it as a chroma key image 212. The second selection unit 104 receives the component video output from the conversion unit 102 and the chroma key video 212 output from the first selection unit 103 as input, and performs 2: 3 pull-down conversion input from the frame rate conversion unit 113. One of these two inputs is selected and output in synchronization with a conversion control signal 302 (described later). Note that both the second selection unit 104 and the recording unit 114 operate in synchronization with the conversion control signal 302.

  The operation of the video signal recording apparatus when creating a chroma key video while performing 2: 3 pull-down conversion from a 24P video signal to a 60P video signal will be described with reference to FIGS. FIG. 2 is a diagram illustrating a case where a chroma key video is created while performing a 2: 3 pull-down conversion from a 24P video signal to a 60P video signal using the video signal recording device of the present embodiment. FIG. 10 is a timing chart up to a signal input to the second selection means 104. The 24P video signal R201, the 24P video signal G202, and the 24P video signal B203 represent four consecutive frames of video as A, B, C, and D, respectively. The frame number 205 is a number assigned for convenience to the 60P video signal output as a result of 2: 3 pull-down conversion.

  FIG. 3 shows the signals after the second selection means 104 when the chroma key video is created while performing the 2: 3 pull-down conversion from the 24P video signal to the 60P video signal using the video signal recording apparatus of the present embodiment. It is a timing diagram.

  First, when the 24P video signal R201, 24P video signal G202, and 24P video signal B203 are input, the frame rate conversion unit 113 sets the frame rate of the input signal to 2: in synchronization with the 24Hz synchronization signal 213 and the 60Hz synchronization signal 204: Three-pull down conversion is performed to output as 60P video signal R206, 60P video signal G207, and 60P video signal B208. Specifically, frame number 1 and frame number 205 of frame number 205, frame B by 3, 4, and 5, frame C by frame numbers 6 and 7, and frame D by 8, 9, 10, respectively. It has been converted.

  Further, the frame rate conversion means 113 outputs the conversion control signal 302 in synchronization with the phase of this 2: 3 pull-down conversion. The conversion control signal 302 is obtained by converting a 24P video signal into a 60P video signal by 2: 3 pull-down conversion, so that when the same video is continuously output by a plurality of frames, one frame among the consecutive frames is output. More specifically, it is a signal indicating the timing at which the eye is output, and more specifically, it is a signal that becomes high level at the timing of the first frame among consecutive frames and becomes low level at the timing after the second frame (high level). , The low level may be reversed). That is, the conversion control signal 302 becomes high level at the timing of frame numbers 1, 3, 6, and 8, and becomes low level at frame numbers 2, 4, 5, 7, 9, and 10. Thus, the phase of 2: 3 pull-down conversion in the frame rate conversion means 113 and the phase of the conversion control signal 302 are synchronized.

  Next, when the 60P video signal R206, 60P video signal G207, and 60P video signal B208 constituting the 60P video signal are input to the conversion means 102, color space conversion is performed and the luminance signal Y209, the color difference signal Cr210, and the color difference signal Cb211 are obtained. Is output. The first selection means 103 selects any one of the 60P video signal R206, 60P video signal G207, and 60P video signal B208 by the switching control means 112 which is an external input, and outputs it as a chroma key video 212. The switching control means 112 may be any method as long as it is a means for selecting any one of these video signals RGB video. In addition to a method that can be set by the user according to the application, for example, the input video is analyzed. Various methods such as a method of automatically selecting an appropriate color signal as the first chroma key image in the video signal processing apparatus or the video signal recording apparatus can be applied.

  Then, a conversion control signal 302 that is an output signal of the frame rate conversion unit 113 is input to the second selection unit 104. For example, the conversion control signal 302 for discriminating the frame and controlling the switching is synchronized with the phase of the 2: 3 pull-down conversion for the cyclic counter that repeatedly counts 5 frames from 1 to 5 in synchronization with the 60 Hz synchronization signal 204, for example. It may be designed to operate so as to be at a high level when the cyclic counter numbers 301 are 1 and 3, as shown in FIG.

  When the conversion control signal 302 is at a high level, the second selection means 104 synchronizes with this, the luminance signal Y209 as the multiplexed signal 303, the color difference signal Cr210 as the color difference signal Cr304, the color difference signal Cb211 as the color difference signal Cb305, Output each. Further, when the control signal 301 is at low level, the second selection means 104 synchronizes with this, and the chroma key video 212 as the multiplexed signal 303, the low level signal as the color difference signal Cr304, and the low level signal as the color difference signal Cb305. Select and output the signal. In other words, the second selection means 104 has three outputs, and the first output signal is a signal obtained by multiplexing the luminance signal 209 with the chroma key video 212 as the multiplexed signal 303 and the second output signal. Outputs the color difference signal Cr210 as the color difference signal Cr304, and the third output signal outputs the color difference signal Cb211 as the color difference signal Cb305. In FIG. 1, when the control signal 301 is at a low level, the second selection unit 104 is designed to output a low level signal by connecting the output of the color difference signal Cr304 and the color difference signal Cb305 to GND. A high level signal may be output when the control signal 301 is at a low level, or the color difference signal Cr 210 and the color difference signal Cb 211 may be always output regardless of the state of the conversion control signal 302.

  Finally, the multiplexed signal 303, the color difference signal Cr304, and the color difference signal Cb305, which are output video signals of the video signal processing apparatus 101, are input to the recording unit 114 and subjected to digital processing such as gamma correction, and then together with the conversion control signal 302. Recorded on a recording medium. The multiplexed signal 303, the color difference signal Cr304, and the color difference signal Cb305 can be recorded on a recording medium by an existing recording method because the video format is not different from the component video of 60 frames / second.

  As described above, by using the video signal processing apparatus of the present invention, a chroma key video having the same bandwidth as the wide-band luminance signal can be multiplexed and output with respect to the video subjected to 2: 3 pull-down conversion. Since a chroma key image having the same band as the broadband luminance signal can be created, a high resolution composite image can be created.

  In the present embodiment, the case where the chroma key video is created while converting the 24P video signal to the 60P video signal has been described as an example. However, the present invention provides M ≧ 2 × N (where M> 0, N> 0). This is applicable to a case where a chroma key video is generated and multiplexed on a video signal obtained by converting a video signal of N frames / second into M frames / second. In other words, as a result of the frame rate conversion, if the conversion is such that at least two frames before the conversion are repeated, the chroma key video can be multiplexed into the second frame of the same video. For example, the present invention can be applied to a case where a 24P video signal is converted into a 50P video signal, or a case where a 30P video signal is converted into a 60P video signal. In addition to the 2: 3 pull-down method, other methods such as a 2: 3: 3: 2 pull-down method can also be applied to the frame rate conversion method. For example, when the 2: 3: 3: 2 pull-down method is applied, the frame rate conversion unit 113 outputs a high level at the timing of frame numbers 1, 3, 6, 9 as the conversion control signal 302, frame numbers 2, 4, A low level may be output at 5, 7, 8, and 10. The second selection unit 104 may switch the output according to this timing.

(Embodiment 2)
FIG. 4 is a block diagram showing an example in which a video signal recording apparatus using the video signal processing apparatus of the present invention is used as a part of a chroma key composite video generation system as Embodiment 2 of the present invention. The video signal recording device 401 is the video signal recording device described in the first embodiment of the present invention in which the digitized 24P video signal is used as the input video signal 405. The video signal recording device 401 records the video signal obtained by multiplexing the chroma key video on the input video signal 405, that is, the multiplexed signal 303, the color difference signal Cr304, the color difference signal Cb305, and the conversion control signal 302 on a recording medium. The video extraction means 402 reproduces these video signals recorded by the video signal recording device 401 from the recording medium as input signals, and from the input signals, a luminance signal Y502, a color difference signal Cr503, a color difference signal Cb504 and a chroma key video 602 are obtained. Extract. The extracted luminance signal Y502, color difference signal Cr503, and color difference signal Cb504 constitute the component video 601 in FIG. The video input unit 404 inputs the background video 604 to the video composition unit 403. The background video 604 may be a video transmitted from the outside or a video reproduced from a recording medium. The video synthesizing unit 403 receives the luminance signal Y502, the color difference signal Cr503, the color difference signal Cb504, the chroma key video 602, and the background video 604, performs a chroma key synthesis process as shown in FIG. 6, and outputs a synthesized video signal 605.

  FIG. 5 is a timing diagram for each frame of each signal in Embodiment 2 of the present invention. First, as in Embodiment 1 of the present invention, the video signal processing unit 402 converts the multiplexed signal 303, the color difference signal Cr304, the color difference signal Cb305, and the conversion control signal 302, which are signals recorded on the recording medium by the video signal recording device 401, into the video extraction processing unit 402. The video signal is extracted as follows.

  When the conversion control signal 302 is at a high level, the video extraction unit 402 extracts the luminance signal 502 from the multiplexed signal 303, which is an input signal, the color difference signal Cr503 from the color difference signal Cr304, and the color difference signal Cr503 from the color difference signal Cb305. When the conversion control signal 302 is at low level, the chroma key video 505 is extracted from the multiplexed signal 303, the low level signal is extracted from the color difference signal Cr304, and the low level signal is extracted from the color difference signal Cb305.

  Next, these signals are input to the image synthesizing unit 403, and the component image 601 and the chroma key image 602 are combined to extract the subject as in the subject image 603. Then, when the video composition unit 403 combines the subject video 603 with the background video 604 input from the video input unit 404, a composite video 605 in which the background and the subject are combined is obtained.

  As described above, according to the second embodiment of the present invention, a chroma key composite video for synthesizing a high resolution image by extracting a broadband chroma key video and a component video from the video signal output by the video signal processing apparatus of the present invention. A generation system can be realized.

  In the present embodiment, the case where the chroma key video is created while converting the 24P video signal to the 60P video signal has been described as an example. However, the present invention provides M ≧ 2 × N (where M> 0, N> 0). In the same manner as in the first embodiment, the present invention can also be applied to a case where a chroma key video is generated and multiplexed on a video signal obtained by converting a video signal of N frames / second into M frames / second. is there.

(Embodiment 3)
FIG. 7 is a block diagram of a video signal recording apparatus using the video signal processing apparatus of the present invention as Embodiment 3 of the present invention. The difference from the first embodiment shown in FIG. 1 is that three modes for outputting a video signal to the recording means 114 are provided, and other configurations are the same. The three modes are a component mode in which a component video composed of a luminance signal Y209, a color difference signal Cr210, and a color difference signal Cb211 is always output, a chroma key mode in which a chroma key video 212 is always output, and a multiplexing mode in which these are multiplexed and output. is there. Switching between these modes is performed by providing a switching control signal generating unit 701 that performs a switching operation by a selection operation unit 702 that inputs a predetermined external operation. That is, the control signal generated by the switching control signal generating unit 701 is input to the second selecting unit 104 based on the switching operation from the selecting operation unit, such as a multiplex mode control signal 801, a component mode control signal 802, and a chroma key mode control signal 803. To select.

  FIG. 8 is a timing chart for each frame of each control signal in Embodiment 3 of the present invention. When the selection operation means 702 selects the input of the switching control signal generation means 701 as the multiple mode control signal 801, the multiple mode control signal 801 is a signal obtained by directly outputting the conversion control signal 302 as shown in FIG. When the multimode control signal 801 is at a high level, a luminance signal and a color difference signal are output from the second selection unit 104, and when the control signal 801 is at a low level, a chroma key image is output from the second selection unit 104. Therefore, the second selection unit 104 outputs a signal obtained by multiplexing the chroma key video on the luminance signal and the color difference signal. This is the same operation as in the previous embodiment. When a signal that is always at a high level, such as the component mode control signal 802, is selected as an input to the switching control signal generating means 701, the output of the second selecting means 104 is always different from the luminance signal and the color difference according to this high level input. It becomes the component video of the signal. When a signal that is always at a low level, such as the chroma key mode control signal 803, is selected as an input to the switching control signal generating means 701, the output of the second selecting means 104 is always a chroma key image in accordance with this low level input. It becomes.

  As described above, by providing the switching control signal generating means 701, when the chroma key image is unnecessary, only the component image can be output if the component mode is set. This can also be used when checking component video on a monitor before shooting. If only the chroma key image is necessary, or if the chroma key image is confirmed on the monitor before shooting, the chroma key mode may be set.

  According to the video signal processing apparatus of the present invention, a wider-band signal can be output than a conventional chroma key video, and a higher quality composite video can be obtained. The present invention can also be applied to a photographing device or a video editing device.

1 is a configuration diagram of a video signal recording apparatus according to Embodiment 1 of the present invention. Timing chart for each frame of signal in Embodiment 1 of the present invention Timing chart for each frame of signal in Embodiment 1 of the present invention Configuration diagram of chroma key composite video generation system in Embodiment 2 of the present invention Timing chart for each frame of each signal in Embodiment 2 of the present invention Diagram explaining the process of creating a composite video with chroma key technology Configuration diagram of video signal recording apparatus according to Embodiment 3 of the present invention Timing chart for each frame of control signal in embodiment 3 of the present invention Configuration diagram of conventional video signal processing device Timing chart when 24P video signal is converted to 60P video signal by 2: 3 pulldown conversion

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... Video signal processing apparatus 102 ... Conversion means 103 ... 1st selection means 104 ... 2nd selection means 112 ... Switching control means 113 ... Frame rate conversion means 114 ... .Recording means 201... 24P video signal R
202... 24P video signal G
203... 24P video signal B
204... 60 Hz synchronization signal 206... 60P video signal R
207 ... 60P video signal G
208 ... 60P video signal B
209 ... Luminance signal Y
210 ... Color difference signal Cr
211 ... Color difference signal Cb
212 ... chroma key image 213 ... 24Hz synchronization signal 302 ... conversion control signal 303 ... multiplex signal 304 ... color difference signal Cr
305 ... Color difference signal Cb
401 ... Video signal recording device 402 ... Video extraction means 403 ... Video composition means 404 ... Video input means 405 ... Input video signal 605 ... Output video signal

Claims (4)

A progressive video signal composed of N frames / second (N> 0) is pulled down and converted to a progressive video signal composed of M frames / second (M ≧ 2 × N) as an input video signal. Conversion means for converting the R, G, B color signal components of the signal into a component video including a luminance signal and a color difference signal and outputting the component video;
First selecting means for selecting any one of the R, G, and B color signal components of the input video signal and outputting it as a chroma key video;
Second selection means for selecting and outputting one of the component video and the chroma key video,
The second selecting means converts a progressive video signal composed of N frames / second into a progressive video signal composed of M frames / second, thereby outputting the same video continuously in a plurality of frames. A video signal processing device that multiplexes the chroma key video with the luminance signal in synchronization with a conversion control signal that is a signal indicating a timing at which the first frame of the plurality of frames is output. 2. The video signal according to claim 1, wherein the input video signal is obtained by converting a progressive video signal composed of 24 frames / second into a progressive video signal composed of 60 frames / second by performing 2: 3 pull-down processing. Processing equipment. 2. The input video signal is obtained by converting a progressive video signal composed of 24 frames / second into a progressive video signal composed of 60 frames / second by performing a 2: 3: 3: 2 pull-down process. The video signal processing apparatus described. The second selection means selects and outputs the luminance signal and the color difference signal in synchronization with the timing at which the first frame is output among the plurality of frames based on the conversion control signal, and outputs other frames. 4. The video signal processing apparatus according to claim 1, wherein the chroma key video is selected and output in synchronization with the input timing of the video signal.

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