JP2003092767A - Video signal judgment apparatus and method, recording medium, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detecte a film video signal. SOLUTION: A difference is calculated between a color difference signal B-Y delayed by one field and an output from a 1-field delay circuit 3 by a subtractor 5 and a color difference signal B-Y before being delayed. In case of a signal of 4:2:0 format, color difference signals at positions corresponding to respective fields constituting a frame have an identical value. An output of the subtractor 5 is 0 when the input is a signal of the field of a corresponding frame, or not 0 when the input is a signal of a field of a different frame. An adder 6 adds the output of the subtractor 5 by one field. A comparator 7 outputs 1 when the added value is greater than a reference value, or 0 when the added value is smaller than the reference value. A controller 8 decides whether the input signal is a film video signal according to the pattern of 1 and 0 output from the comparator 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal discriminating apparatus and method, a recording medium, and a program, and in particular, it is possible to surely discriminate whether or not it is a film video signal with a simple structure. And a recording medium, and a program.

[0002]

2. Description of the Related Art Recently, in order to allow a video signal to be viewed with less flicker, an interlaced video signal has been often converted into a progressive video signal.

The video signal of the NTSC system is 60 per second.
It consists of fields (30 frames). On the other hand, the number of frames per second of the signal shot by the motion picture film is 24 frames. Therefore, when converting a movie image into an NTSC video signal, 3-2
Conversion processing is performed by the pull-down method. When this conversion process is performed, the image of the same frame is arranged in two consecutive fields, and the same image of the next frame is arranged in the following three consecutive fields. As a result, an image of 24 frames can be assigned to 60 fields.

As described above, in the 3-2 pulldown-converted film video signal, the video signal of the first field and the third field of the three consecutive fields are
The video signals are exactly the same. When converting an interlaced video signal to a progressive video signal,
If the same video signal has already been coded, the processing of the second appearing video signal can be omitted. Therefore, if it is known in advance whether or not it is a film video signal, more efficient encoding becomes possible.

Therefore, a method for determining whether or not the film video signal has been subjected to the 3-2 pulldown conversion process is disclosed in, for example, US Pat. No. 4,982,280.

FIG. 1 illustrates the principle of the system proposed in this US patent. As shown in the figure, the video signal is a signal in which odd (O) and even (E) fields appear alternately. In the case of the 3-2 pull-down converted video signal, the image (luminance signal) of the first frame A is a video signal of two fields of the odd field Ao and the even field Ae.

The image of the next frame B is an odd field,
It is placed in three fields, the even field and the next odd field. That is, the first field is the odd field Bo, the next field is the even field Be, and the third field is the odd field Bo. Therefore, the first odd field Bo and the third odd field Bo out of the three fields have exactly the same signal.

Hereinafter, the video signals of the respective frames of the film such as the frame C, the frame D, the frame E and the frame F are similarly assigned to the respective fields of the video signal.

Now, assuming that the original signal that has not been delayed among the luminance signals is F0, this original signal F0 is delayed by one field and becomes the signal F1. This signal F1
Is further delayed by one field and becomes a signal F2.

The frame difference value obtained by subtracting the signal F2 from the signal F0 outputs 1 in the case of subtracting the color difference signals of different fields, and outputs 0 in the case of subtracting the color difference signals of the same field. As shown in FIG. 1, the values of the signals F0 and F2 are Bo, De, Fo, He ...
・ It becomes the same. As a result, the values of F0-F2 are 11011111011110 ... With a delay of one field. That is, 5 fields are set as a cycle, and 1 is set for each cycle.
The number of times is 0.

On the other hand, in the case of a normal NTSC video signal which is not a 3-2 pulldown converted video signal, the frame difference is 11111111.
・ It becomes.

Therefore, it is possible to determine whether or not it is a film video signal from the difference in the frame difference pattern.

By the way, in the case of the PAL system, it takes 25 seconds (50 fields) for 1 second. Film images
When converting to a PAL video signal, 2-2 pulldown conversion is performed at a 4% speed increase.

FIG. 2 shows the F in the 2-2 pulldown conversion.
0-F1 and F0-F2 are shown.

The values of F0-F2 are Bo-Ao, Be-Ae, Co-B.
o, Ce-Be, and so on, and because there is a difference between the signals of different frames, the value of the difference becomes large, 11111 ...
・ It becomes.

On the other hand, the values of F0-F1 are Ae-Ao, Bo-Ae,
As in Be-Bo, Co-Be, ..., the field difference of the same frame is calculated every other field. Therefore, a pattern of 010101 ... Is obtained.

On the other hand, in the case of a normal PAL system video signal (in the case of a video signal not subjected to 2-2 pulldown processing), the values of F0-F1 and F0-F2 are both 1
1111 ... Therefore, it can be determined by F0-F1 whether or not the video signal has been subjected to the 2-2 pulldown conversion.

[0018]

By the way, as shown in FIG. 2, the field difference at the time of 2-2 pull-down conversion becomes the pattern of 01010101 ... Is generated from the same frame (frame). It is premised that there is a high degree of correlation between the captured odd-field and even-field images.

However, for example, an image having a high frequency component in the vertical direction may exist in the video signal. Such images are particularly common in images output by progressive cameras and images by computer graphics. Such an image may have low correlation even if it is an odd-field image and an even-field image generated from the same frame. For example, it is well known that an image having fine horizontal stripes has a low correlation between two fields of an odd field and an even field.

Therefore, conventionally, the threshold value for the determination for detecting the 2-2 pulldown converted video signal has been set to a small value. However, in such a case, a pattern of 101010 ... Appears even in the case of a normal video signal, and as a result, it is impossible to accurately detect that the signal is a 2-2 pull-down converted signal. there were.

The present invention has been made in view of such a situation, and even if there is no correlation between the odd field image and the even field image generated from the same frame,
The film video signal can be accurately detected.

[0022]

A video signal discriminating apparatus according to the present invention comprises a delay means for delaying a color difference signal composed of pixels having the same value in upper and lower lines by one field, and the color difference signal, The calculation means calculates the difference from the color difference signal delayed by one field by the delay means, the addition means for accumulating and adding the difference calculated by the calculation means for one field, and the addition means. And a determination means for determining whether the signal is a film video signal by comparing the signal with a predetermined reference value. With such a configuration, it is possible to accurately detect whether or not it is a film video signal without being affected by the correlation between the images of the odd field and the even field.

The color difference signal may be one of the color difference signals compressed in a 4: 2: 0 format.

In the video signal discriminating method of the present invention, a delay step for delaying the color difference signal by one field and a difference between the color difference signal and the color difference signal delayed by one field by the processing of the delay step are calculated. Calculation step,
Whether the signal is a film video signal by comparing an addition step of accumulating and adding the differences calculated by the processing of the calculation step for one field and a signal obtained by the addition of the processing of the addition step with a predetermined reference value. And a determination step of determining whether or not it is.

The program of the recording medium of the present invention calculates the delay step of delaying the color difference signal by one field, and the difference between this color difference signal and the color difference signal delayed by one field by the processing of the delay step. A film image is calculated by comparing the signal obtained by the calculation step and the addition step of accumulating and adding the difference calculated by the processing of the calculation step for one field, and the predetermined reference value. And a determination step of determining whether or not the signal is a signal.

The program of the present invention comprises a delay step of delaying the color difference signal by one field, a calculation step of calculating the difference between the color difference signal and the color difference signal delayed by one field by the processing of the delay step, Whether the signal is a film video signal by comparing the signal obtained by the addition step of accumulating and adding the differences calculated by the processing of the calculation step for one field and the predetermined reference value with the addition step A computer is made to perform the determination step which determines whether or not.

In the present invention, the difference between the color difference signal delayed by one field and the color difference signal not delayed is calculated.
By accumulating one field, it is determined whether or not it is a film video signal.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows an example of the structure of a DVD player to which the film video signal discriminating apparatus of the present invention is applied. In this configuration example, a DVD (Digital Versatile Disc) (not shown) is reproduced by the DVD drive 1. This DVD has an interlaced video signal of 4: 2:
It is recorded in the 0 format. Figure 4 shows this 4:
It is a figure explaining the 2: 0 format.

In the case of this format, the luminance signal has a predetermined value for each pixel as shown in FIG. 4A. On the other hand, the color-difference signal BY and the color-difference signal R-Y have the same value for 4 pixels of 2 × 2 as shown in FIGS. 4B and 4C, respectively.

A video signal reproduced from a DVD by the DVD drive 1 is supplied to an MPEG2 (Moving Picture Expert Group) decoder 2 and decoded. MPEG2 decoder 2
Of the signals decoded by, the vertical sync signal Vs is
It is supplied to the adder circuit 6 and the comparison circuit 7. The luminance signal Y and the color difference signals BY and RY are respectively detected by the detection circuit 21.
Is supplied to the 1-field delay circuit 3. The 1-field delay circuit 3 delays the input signal by 1 field and then supplies the delayed signal to the 1-field delay circuit 4 in the subsequent stage. The signal output from the 1-field delay circuit 3 is also supplied to the subtraction circuit 5 and the time base compression circuit 10.

The 1-field delay circuit 4 further delays the signal input from the 1-field delay circuit 3 by 1 field, and then outputs it to the selector 9. The selector 9 is also supplied with the non-delayed luminance signal Y output from the MPEG2 decoder 2 and the color difference signals BY and RY signals.

The subtraction circuit 5 is a color difference signal B- of the undelayed signal F0 output from the MPEG2 decoder 2.
The difference between Y or RY and the color difference signal BY or RY of the video signal F1 delayed by one field output from the one-field delay circuit 3 is calculated.

The output from the subtraction circuit 5 is supplied to the addition circuit 6, and the output values are cumulatively added for each field.
The value output from the adder circuit 6 is supplied to the comparison circuit 7 and compared with a predetermined reference value set in advance for each field.

The output of the comparison circuit 7 is supplied to the controller 8. From the output of the comparison circuit 7, the controller 8
It is determined by the sequence whether or not the video signal currently input is a film video signal.

Then, the controller 8 controls the selector 9 to output the signal F0 of the undelayed field output from the MPEG2 decoder 2 and the 1-field delay circuit 4
As a result, one of the signals F2 delayed by two fields with respect to the signal F0 is selected and output to the time axis compression circuit 11. That is, the controller 8 uses the signal F1 delayed by one field output from the one-field delay circuit 3 as a reference, and outputs the signal F0 of the preceding and following fields.
And the signal F2 closer to the signal F1 is selected.

The time axis compression circuit 10 double-speed-converts the signal F1 delayed by one field output from the one field delay circuit 3 by time axis compression, and the selector 12
Output to. The time axis compression circuit 11 also double-speed-converts the signal input from the selector 9 by time axis compression and outputs the signal to the selector 12. The selector 12 is the controller 8
And selects either one of the signals input from the time axis compression circuit 10 or the time axis compression circuit 11,
Output to the D / A converter A13. The D / A converter A13 D / A converts the input signal and outputs it as a progressive video signal. The controller 8
Also generates and outputs a horizontal sync signal and a vertical sync signal.

Next, referring to the flowchart of FIG.
The operation of the DVD player shown in FIG. 3 will be described. FIG. 6 is a diagram for explaining the principle of 3-2 pulldown detection in the present invention. Description will be made with reference to FIG. 6 as necessary.

When the reproduction is instructed, the DVD drive 1
It plays the mounted DVD and outputs the video signal. The MPEG2 decoder 2 decodes the video signal input from the DVD drive 1 by the MPEG method, and outputs the luminance signal Y, the color difference signal BY, and the color difference signal RY to the 1-field delay circuit 3 and the selector 9, respectively. Further, only the color difference signals BY or RY are input to the subtraction circuit 5.

The video signal reproduced and output by the DVD drive 1 is a 4: 2: 0 format signal as shown in FIG. In the case of this format, for example, a color difference signal BY (color difference signal BY of odd field) corresponding to the first line in FIG.
The color difference signals BY (color difference signals BY of the even field) corresponding to the lines have the same value.

The 1-field delay circuit 3 operates in step S1.
, The input color difference signal BY or RY is set to 1
It is delayed by the field and output to the subtraction circuit 5.

In step S2, the subtraction circuit 5 outputs MP
Undelayed signal F output from EG2 decoder 2
Of 0, the color difference signal (FIG. 6B) is taken in and
The color difference signal (FIG. 6C) of the signal F1 delayed by one field output from the field delay circuit 3 is fetched and F0-F1 is calculated (FIG. 6D). This F0-F1
In the subtraction of 0, 0 is always output for corresponding signals of the same frame or frame, and 1 is output for signals of different frames or frames.

In step S3, the difference signal (FIG. 6D) output from the subtraction circuit 5 is output to the addition circuit 6,
The value for one field is added. In step S4, the comparison circuit 7 compares the addition value for one field supplied from the addition circuit 6 with a preset reference value. This reference value is set to an intermediate value between the maximum value and the minimum value of the accumulated difference values.

When the added value is larger than the reference value, the comparison circuit 7 proceeds to step S6 and outputs a logic 1, and when the added value is not larger than the reference value, it proceeds to step S5 and outputs a logic 0. Since the addition for one field is required, the output of the comparison circuit 7 (FIG. 6D) is delayed by one field.

In FIG. 6, the value of the undelayed color difference signal F0 (FIG. 6B) is B in the first field.
, The color difference signal F1 delayed by one field (see FIG. 6).
The value of C) becomes A, and these values are different over one field. In that case, 1 is output from the subtraction circuit 5 in step S2, the value for one field is added by the addition circuit 6 in step S3, and the value is delayed by one field at the timing of the second field (step S4). At 1, the comparison circuit 7 compares the addition value for one field supplied from the adder 6 with a predetermined reference value, and the comparison circuit 7 outputs 1 (FIG. 6D).

In the second field, the value of the color difference signal F0 which is not delayed (FIG. 6B) and the value of the color difference signal F1 which is delayed by one field (FIG. 6C) are both B, and both are the same. Become. In that case, step S
In step 2, 0 is output from the subtraction circuit 5, and step S
In 3, the value of one field is added by the adder circuit 6, and at the timing of the third field (delayed by one field), in step S4, the value of one field supplied from the adder 6 is supplied by the comparator circuit 7. And the predetermined reference value are compared, and 0 is output from the comparison circuit 7 (FIG. 6D).

In step S7, the controller 8 determines from the pattern of logic 1 and logic 0 output by the comparison circuit 7 (FIG. 6D) whether the video signal currently reproduced and output by the DVD drive 1 is a film video signal. To determine.

Therefore, as shown in FIG. 6D, the pattern of the field difference output from the comparison circuit 7 is 1001 in the case of the 3-2 pull-down type video signal.
0100101 ... In this way, it can be determined that it is a film video signal and its sequence (phase).

FIG. 7 is a diagram for explaining the principle of detection of a video signal of a normal moving image, FIG. 8 is a diagram for explaining a principle of detection of a video signal of a normal still image, and FIG. 9 is a diagram. It is a figure explaining the principle of the detection of the 2-2 pulldown system video signal in this invention. In the case of such a normal video signal, in the case of a moving image, since the encoding is performed in field units, the pattern of F0-F1 becomes 111111 ... As shown in FIG. If it's a still image,
Since the encoding is performed on a frame-by-frame basis, it becomes 00000 ... As shown in FIG. Therefore, it is possible to reliably determine whether the image signal is a film image signal or a normal image signal from the difference between the patterns.

In the case of the 2-2 pull-down type video signal, the pattern of F0-F1 is 10101010 ... As shown in FIG. With conventional technology,
It was premised that the odd-field and even-field images generated from the same frame (frame) had a high correlation, but in the present embodiment, the video signal is recorded in the 4: 2: 0 format. Since this is utilized, it is possible to make a determination even when there is no image correlation.

FIG. 10 is a diagram for explaining the principle of progressive signal conversion according to the present invention. 10A and FIG.
B, FIG. 10D, and FIG. 10G respectively show FIG. 6A,
6B, 6C, and 6D. In FIG. 3, the selector 9 is controlled by the controller 8,
As shown in FIG. 10H, the two-field delayed signal F2 output from the one-field delay circuit 4 is output once every two fields and then once every two fields.
Select. At other times, the selector 9 selects the undelayed signal F0 signal.

The signal output from the selector 9 is supplied to the time-base compression circuit 11 for conversion to the progressive system, and is double-speed converted by the time-base compression. The time axis compression circuit 10 double-speed-converts the signal F1 delayed by one field output from the one field delay circuit 3 by time axis compression.

FIG. 11 shows the input and output timings of the time base compression circuit 10 and the time base compression circuit 11.
Note that FIGS. 12, 13, and 14 each show an enlarged portion from the period T1 to T3 in FIG.

Note that, in these figures, each field is assumed to be composed of six lines for convenience of explanation.

As the selector 9 is shown in FIG. 10H,
As a result of selecting the signal of the field F0 or the field F2, of the outputs, the luminance signal is as shown in FIG. 10I and the color difference signal is as shown in FIG. 10J.

The time-axis compression circuit 10 writes the data of the first line of the signal F1 output from the 1-field delay circuit 3 in the odd-field period T1 shown in FIGS. 11 and 12 and performs time-axis compression. , To the selector 12. The time axis compression circuit 11 compresses the data of the second line supplied from the selector 9, and the time axis compression circuit 1
0 outputs the data of the first line and then outputs it to the selector 12.

In the same manner, the time axis compression circuit 10 uses the third
The data of the line and the fifth line are sequentially compressed and output, and the time axis compression circuit 11 sequentially compresses and outputs the data of the fourth line and the sixth line.

The selector 12 alternately selects the data of each line output from the time-axis compression circuit 10 or the time-axis compression circuit 11 so that the first line, the second line, the third line, the fourth line, Output to the D / A converter 13 in the order of the fifth line and the sixth line. The D / A converter 13 D / A converts the input data and outputs it.

As shown in FIGS. 11 and 13, during the even field period T2, the time axis compression circuit 1
0 sequentially compresses and outputs the data of the second line, the fourth line, and the sixth line, and the time axis compression circuit 11 sequentially compresses and outputs the data of the first line, the third line, and the fifth line. .

Even in this case, the selector 12 alternately selects the outputs of the time axis compression circuit 10 and the time axis compression circuit 11 to sequentially select and output the data of the first line to the sixth line.

In the odd field period T3 shown in FIGS. 11 and 14, the same processing as in the period T1 is executed.

The series of processes described above can be executed by hardware, but can also be executed by software. In this case, for example, the DVD player is composed of a computer as shown in FIG.

The computer shown in FIG. 15 has a CPU (C
entral Processing Unit) 41, ROM (Read Only M)
at least an emory) 42, a RAM (Random Access Memory) 43, and a drive 50, and the CPU 41 is a ROM 4
2 stored in the program, or from the storage unit 48
Various processes are executed according to the program loaded in the RAM 43. The RAM 43 also appropriately stores data necessary for the CPU 41 to execute various processes.

The CPU 41, the ROM 42, and the RAM 43 are connected to each other via a bus 44. An input / output interface 45 is also connected to the bus 44.

The input / output interface 45 includes an input unit 46 including a keyboard and a mouse, a display including a CRT and an LCD, an output unit 47 including a speaker, and a storage unit 48 including a hard disk.
A communication unit 49 including a modem and a terminal adapter is connected. The communication unit 49 performs communication processing via a network including the Internet.

A drive 50 is connected to the input / output interface 45 as required, and the magnetic disk 61,
The optical disc 62, the magneto-optical disc 63, the semiconductor memory 64, or the like is appropriately mounted, and the computer program read from them is installed in the storage unit 48 as necessary.

When the series of processes described above is executed by software, various programs can be created by installing a computer in which a program forming the software is incorporated in dedicated hardware, or by installing various programs. It is installed from a network or a recording medium into, for example, a general-purpose personal computer capable of executing the function of.

As shown in FIG. 15, this recording medium includes a magnetic disk 61 (including a floppy disk) on which a program is recorded, which is distributed in order to provide the program to the user, separately from the apparatus body. Optical disc 6
2 (CD-ROM (Compact Disk-Read Only Memory), DVD (Digit
al Versatile Disk), magneto-optical disk 63 (M
D (including Mini-Disk)) or semiconductor memory 64
In addition to being configured by a package medium such as the above, it is configured by a ROM 42 in which a program is recorded, which is provided to the user in a state of being incorporated in the apparatus body in advance, a hard disk included in the storage unit 48, and the like.

In the present specification, the steps for describing the program recorded on the recording medium are not limited to the processing performed in time series according to the order described, but are not necessarily performed in time series. It also includes processing executed in parallel or individually.

In this specification, the system means
It represents the entire apparatus composed of a plurality of devices.

The video signal discriminating apparatus of the present invention is a DVD
It is needless to say that the present invention can be applied not only to a player but also to a digital broadcast receiver that receives a digital broadcast compressed and encoded by MPEG2.

[0071]

As described above, according to the video signal discriminating apparatus and method, the recording medium, and the program of the present invention, whether or not it is a film video signal is discriminated based on the color difference signal. It becomes possible to make a judgment.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a principle of detection in a conventional 3-2 pull-down method.

FIG. 2 is a diagram illustrating a principle of detection in a conventional 2-2 pull-down method.

FIG. 3 is a block diagram showing a configuration of a DVD player to which the present invention is applied.

FIG. 4 is a diagram illustrating a 4: 2: 0 format.

FIG. 5 is a flowchart illustrating a film video signal determination process of the present invention.

FIG. 6 is a diagram illustrating the principle of detection of a 3-2 pulldown video signal according to the present invention.

FIG. 7 is a diagram illustrating a principle of detecting a video signal of a normal moving image.

FIG. 8 is a diagram illustrating a principle of detection of a video signal of a normal still image.

FIG. 9 is a diagram illustrating the principle of detection of a 2-2 pulldown video signal according to the present invention.

FIG. 10 is a diagram for explaining the principle of progressive signal conversion of the present invention.

11 is a timing chart for explaining writing and reading by the time axis compression circuit in the DVD player of FIG.

12 is a timing chart showing an enlarged part of a period T1 in FIG.

13 is a timing chart showing an enlarged part of a period T2 in FIG.

14 is a timing chart showing an enlarged part of a period T3 in FIG.

FIG. 15 is a block diagram showing a configuration example of a computer to which the present invention is applied.

[Explanation of symbols]

1 DVD drive, 2 MPEG2 decoder, 3, 4
1 field delay circuit, 5 subtraction circuit, 6 addition circuit, 7 comparison circuit, 8 controller, 9 selector, 10, 11 time base compression circuit, 12 selector, 13 D / A converter

Claims (8)

[Claims] 1. At least an odd field and an even field corresponding to the odd field, delay means for delaying a color difference signal including the same pixel by one field, the color difference signal, and the delay Calculating means for calculating a difference from the color difference signal delayed by one field by means, adding means for accumulating and adding the difference calculated by the calculating means for one field, and adding by the adding means A video signal discriminating apparatus comprising: a discriminating unit for discriminating whether or not it is a film video signal by comparing the obtained signal with a predetermined reference value. 2. The video signal discriminating apparatus according to claim 1, wherein the color difference signal is one of the color difference signals compressed in a 4: 2: 0 format. 3. A delay step of delaying a color difference signal including the same pixels by at least one field in at least an odd field and an even field corresponding to the odd field, the color difference signal, and the delay. A calculation step of calculating a difference from the color difference signal delayed by one field by the processing of the step, an addition step of accumulating and adding the difference calculated by the processing of the calculation step for one field, and the addition A video signal discriminating method comprising: a discriminating step of discriminating whether the signal is a film video signal by comparing the signal obtained by the addition of the step processing with a predetermined reference value. 4. The method according to claim 3, wherein the color difference signal is one of the color difference signals compressed in a 4: 2: 0 format. 5. A delay step of delaying a color difference signal including the same pixels by at least one field in at least an odd field and an even field corresponding to the odd field, the color difference signal, and the delay. A calculation step of calculating a difference from the color difference signal delayed by one field by the processing of the step, an addition step of accumulating and adding the difference calculated by the processing of the calculation step for one field, and the addition A computer-readable program recorded, comprising: a determination step of determining whether or not it is a film video signal by comparing the signal obtained by the addition of the step processing with a predetermined reference value. Recording medium. 6. The recording medium according to claim 5, wherein the color difference signal is one of the color difference signals compressed in a 4: 2: 0 format. 7. A first delay step of delaying a color difference signal including the same pixel by at least one field in at least an odd field and an even field corresponding to the odd field, and the color difference signal. A calculation step of calculating a difference from the color difference signal delayed by one field by the processing of the first delay step, and the difference calculated by the processing of the calculation step is accumulated for one field and added A program that causes a computer to execute an addition step and a determination step of comparing a signal obtained by addition in the processing of the addition step with a predetermined reference value to determine whether the signal is a film video signal. 8. The program according to claim 7, wherein the color difference signal is one of color difference signals compressed in a 4: 2: 0 format.