JP3833076B2 - Video signal processing apparatus, video signal processing method, and video signal processing method program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a video signal processing device, a video signal processing method, and a video signal processing method program. For example, when a 2-3 pulldown field sequence is detected from a video signal created by a 2-3 pulldown system. Can be applied. The present invention provides, for example, 2-3 pulldown based on the detection of the same field related to repetition based on the magnitude of the motion vector and the detection of the previous field of the same field based on the motion vector difference value between fields. By determining the same field related to the repetition in the system, the field sequence can be detected with higher accuracy than in the past.
[0002]
[Prior art]
Conventionally, the telecine apparatus generates a video signal of 60 [field / second] from a movie film of 24 [frame / second] by a 2-3 pull-down method.
[0003]
That is, in this 2-3 pull-down method, as shown in FIG. 4, by repeating the process of generating a video signal VS of 5 fields from 2 frames by a movie film, the number of fields is converted and the video signal VS by the NTSC method is used. Is generated. For this reason, in the telecine device, the same field is repeated every five frames by opening the same frame for every five frames and processing the imaging result. Thus, the video signal VS is generated. In FIG. 4, the same field related to this repetition is indicated by hatching.
[0004]
As a result, the video signal VS created in this way has a drawback that the motion becomes discontinuous in a continuous field. The field sequence in the 2-3 pull down method is detected to correct discontinuous motion.
[0005]
FIG. 5 is a block diagram showing a field sequence detection circuit disclosed in Japanese Patent Laid-Open No. 5-183884. In the field sequence detection circuit 1, the frame memory (FM) 2 temporarily delays and outputs the video signal VS by one frame by temporarily holding and outputting the video signal VS.
[0006]
The subtracting circuit 3 sequentially subtracts the input / output signals of the frame memory 2, and the absolute value converting circuit 4 converts the output signal of the subtracting circuit 3 into an absolute value and outputs it. The integrating circuit 5 cumulatively adds the output value of the absolute value converting circuit 4 for each field on the basis of the field clock FCK of the field period, and outputs the cumulative addition result. The comparison circuit (COM) 6 determines the cumulative addition result output from the integration circuit 5 based on a predetermined comparison reference value, and outputs a determination result that falls to logic 0 in the same field related to repetition. Thereby, the field sequence detection circuit 1 detects the difference value of each pixel between corresponding fields, and detects the same field concerning repetition.
[0007]
The registers (R) 7A to 7E sequentially transfer the determination results based on the field clock FCK, and the OR circuit 8 outputs a logical sum of the outputs of the registers 7A to 7E. The inverter 9 receives the output of the final-stage register 7E, inverts the logical value, and outputs it. The AND circuit 10 receives the outputs of the registers 7A to 7E, the OR circuit 8, and the output of the inverter 9, and outputs the logical product of these outputs as the field sequence detection result S1. Thus, in the field sequence detection circuit 1, erroneous detection is prevented by effectively utilizing the 2-3 pull-down regularity in which the same repeated field is repeated every five fields.
[0008]
On the other hand, FIG. 6 shows a field sequence detection circuit disclosed in Japanese Patent Application Laid-Open No. 8-237694. The field sequence detection circuit 11 detects a field sequence based on a motion vector. That is, in the field sequence detection circuit 11, the pre-filter 13 selectively receives the luminance signal VSY constituting the video signal VS, and band-limits the luminance signal VSY in order to reduce errors at the time of motion vector detection. And output.
[0009]
The frame memory (FM) 14 temporarily holds the luminance signal VSY and outputs it, thereby delaying the luminance signal VSY by one frame and outputting it. The motion vector detection circuit 15 detects the motion vector (Vx, Vy) of the luminance signal VSY output from the prefilter 13 with reference to the luminance signal VSY output from the frame memory 14. The motion vector detection circuit 15 detects the motion vector (Vx, Vy) of the luminance signal VSY, for example, in units of macro blocks.
[0010]
The comparison circuit (COM) 16 determines the magnitude of the motion vector (Vx, Vy) based on the two-dimensional motion determination reference value (α, β) corresponding to the motion vector (Vx, Vy), and the motion determination reference value When the motion vector (Vx, Vy) is smaller than (α, β), the input motion vector (Vx, Vy) is output as it is.
[0011]
The majority circuit 17 detects the number of motion vectors (Vx, Vy) having the highest number of detections in each field by counting the motion vectors (Vx, Vy) output from the comparison circuit 16 in units of fields. It is determined whether the number is equal to or greater than a predetermined value. As a result, the majority circuit 17 detects the same field related to the repetition by detecting the field in which the motion vector is concentrated in the vicinity of the value 0.
[0012]
The delay circuit (DL) 18 delays and outputs the determination result of the majority circuit 17 by five fields, and the determination circuit 19 compares the input and output of the delay circuit 18 and compares the comparison result with the field sequence detection result S1. Output. As a result, this field sequence detection circuit 11 also effectively avoids erroneous detection by effectively utilizing the 2-3 pull-down regularity in which the same repeated field is repeated every five fields.
[0013]
[Problems to be solved by the invention]
By the way, in the field sequence detection circuit 1 disclosed in Japanese Patent Laid-Open No. 5-183884, the difference value of each pixel is detected between corresponding fields, and the same field related to repetition is detected, and thus repeated. If there is motion between fields, the field sequence cannot be detected correctly.
[0014]
On the other hand, in a telecine device that generates such a video signal VS, the same frame is repeatedly imaged to create the same field related to this repetition, and the motor rotation unevenness, gears, etc., during movie frame advance In some cases, blurring may occur due to mechanical factors, and movement may occur in the same field related to such repetition.
[0015]
As a result, the field sequence detection circuit 1 disclosed in Japanese Patent Application Laid-Open No. 5-183884 has a problem that the field sequence cannot be detected correctly due to shaking.
[0016]
On the other hand, in the field sequence detection circuit 11 disclosed in Japanese Patent Application Laid-Open No. 8-237694, by setting the motion determination reference value (α, β) in the comparison circuit 16, erroneous detection of the field sequence due to such blurring is performed. Can be prevented. In other words, since the blur at the time of frame advancement is small, by setting the motion judgment reference values (α, β), only a motion vector having a small blur value is selectively processed, and the blur is caused by the blur. False detection can be prevented. In addition, in such a blur, the horizontal determination reference value α in the motion determination reference value (α, β) is also generated by occurrence in the continuous direction of frames (that is, the vertical direction of the display image). Can be set small to prevent erroneous detection due to shaking.
[0017]
However, if the setting is made in this way, it becomes more sensitive to shaking, and there is a problem that the field sequence is erroneously detected. Further, when the motion speed is low in continuous fields, there is a problem that the same field related to repetition is erroneously detected, and thereby the field sequence is erroneously detected. Further, when a motion vector is erroneously detected, there is a problem that a field sequence is erroneously detected.
[0018]
The present invention has been made in view of the above points, and an object of the present invention is to propose a video signal processing apparatus and a video signal processing method capable of detecting a field sequence more accurately than in the past.
[0019]
[Means for Solving the Problems]
In order to solve such a problem, the invention of claim 1 is applied to a video signal processing apparatus for detecting the same field related to repetition in the field number conversion process from consecutive fields of the video signal, and is applied in units of pixels or predetermined From the motion vector detection means for detecting the motion vector of the video signal in block units and the motion vector detected by the motion vector detection means, the number of motion vectors below the motion determination reference value is calculated in field units, and the number First field detecting means for detecting a field having a value equal to or greater than the first number determination reference value; difference value detecting means for detecting a difference value between motion vectors detected by the motion vector detecting means between consecutive fields; The number of difference values greater than or equal to the difference value determination reference value is calculated for each field, and the number is equal to or less than the second number determination reference value. A second field detecting means for detecting a field of the second field detecting means, and when the corresponding field is detected by the first field detecting means after the corresponding field is detected by the second field detecting means, And determining means for determining that the field detected by one field detecting means is the same field related to repetition.
[0021]
And claims 2 In the invention, the motion of the video signal is applied in units of pixels or in units of predetermined blocks by applying to the video signal processing method for detecting the same field related to repetition in the field number conversion process from the continuous fields of the video signal. From the motion vector detection step for detecting the vector and the motion vector detected in the motion vector detection step, the number of motion vectors equal to or less than the motion determination reference value is calculated for each field, and the number is determined as the first number determination. A first field detection step for detecting a field equal to or greater than a reference value; a difference value detection step for detecting a difference value between motion vectors detected in the motion vector detection step between consecutive fields; and a field unit The number of difference values less than or equal to the difference value determination reference value is calculated, and the number is equal to or less than the second number determination reference value. When a corresponding field is detected in the second field detecting step and the second field detecting step detects the next field, and the subsequent field is detected as the corresponding field in the first field detecting step. And a step of determining that the field detected in the first field detecting step is the same field related to the repetition.
[0022]
And claims 3 In the present invention, the present invention is applied to a program for a video signal processing method so as to be a program by a video signal processing method according to claim 3.
[0023]
According to the configuration of the first aspect, the present invention is applied to a video signal processing device that detects the same field related to repetition in the field number conversion process from consecutive fields of the video signal, and the video is processed in units of pixels or in units of predetermined blocks From the motion vector detection means for detecting the motion vector of the signal and the motion vector detected by the motion vector detection means, the number of motion vectors equal to or less than the motion determination reference value is calculated in field units, and the number is the first number. By including the first field detection means for detecting a field that is equal to or greater than the determination reference value, the first field detection means can detect the same field that is inherently repeated without motion. Further, a difference value detecting means for detecting a difference value between motion vectors detected by the motion vector detecting means between consecutive fields, and the number of difference values equal to or less than the difference value determination reference value for each field are calculated, And a second field detecting means for detecting a field whose number is equal to or greater than the second number determination reference value, and the second field detecting means is used for the repetition of the motion vector difference value that is essentially zero. The field immediately before the same field can be detected. Thus, after the corresponding field is detected by the second field detecting means, and the subsequent field is detected as the corresponding field by the first field detecting means, the field detected by the first field detecting means is By providing the determination means for determining the same field related to repetition, the detection accuracy can be improved as compared with the related art. In other words, in the field immediately before being detected by the second field detecting means, it is a difference value of motion vectors detected between fields acquired from the same frame, so that even if the frame advance is blurred, it is almost the same value. As a result, the sensitivity to blurring can be lowered, for example, by loosening the motion determination reference value in the first field detection means. In addition, even when the first field detection unit detects an error when the movement is slow, the second field detection unit can correctly detect the movement. Even when an error occurs in motion vector detection, the amount of deviation due to the error is small after one field, so that the detection accuracy can be improved as compared with the conventional case.
[0025]
This makes the claim 2 Or claim 3 With this configuration, it is possible to provide a video signal processing apparatus, a video signal processing method, or a video signal processing method program that can detect a field sequence with higher accuracy than in the past.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0027]
(1) First embodiment
(1-1) Configuration of the first embodiment
FIG. 1 is a block diagram showing a field sequence detection circuit according to an embodiment of the present invention. In this field sequence detection circuit 21, the same configuration as that of the field sequence detection circuit 11 described with reference to FIG.
[0028]
In this field sequence detection circuit 21, the motion vector detection circuit 15 detects a motion vector (Vx, Vy) by using, for example, a block matching technique in units of 8 pixel × 8 line macroblocks. As a result, the motion vector detection circuit 15 detects 2700 motion vectors (Vx, Vy) in one field. In the comparison circuit 16, the motion determination reference values (α, β) are (± l pixel, ± 2 lines). As a result, the field sequence detection circuit 21 sequentially detects motion vectors (Vx, Vy) below the motion determination reference values (α, β).
[0029]
The accumulation comparison circuit 22 calculates the number γ of motion vectors (Vx, Vy) equal to or less than the motion determination reference values (α, β) detected in this way in units of fields, and the number γ is a predetermined determination reference. It is determined whether or not the value is γ1 or more, and the determination result is output. Here, the criterion value γ1 is set to 2000 for 2700 blocks in one field. As a result, the field sequence detection circuit 21 detects a field that is determined to be the same field as a repetition based on the magnitude of the motion vector.
[0030]
The delay circuit 23 delays and outputs the motion vector (Vx, Vy) detected by the motion vector detection circuit 15 by one field. The difference circuit 24 calculates a difference value between the input and output of the delay circuit 23, thereby calculating a difference value between fields for motion vectors (Vx, Vy) detected continuously. Thereby, the field sequence detection circuit 21 calculates a deviation amount Δ (Vx, Vy) in the time axis direction of the motion vector (Vx, Vy).
[0031]
The comparison / selection circuit 25 compares the output value Δ (Vx, Vy) of the difference circuit 24 with a predetermined difference value determination reference value (α2, β2) corresponding to the output value, and this difference value determination reference value (α2 , Β2) The following output value Δ (Vx, Vy) is selectively output. The accumulation comparison circuit 26 calculates the number of output values Δ (Vx, Vy) output from the comparison / selection circuit 25 for each field, and determines whether the number β is equal to or greater than a predetermined determination reference value β1. Output the result. As a result, the comparison / selection circuit 25 detects the continuation of the field having the same generation reference frames of the motion vectors (Vx, Vy).
[0032]
That is, as shown in FIG. 2, between two fields using the 2-3 pull-down method, in the two fields immediately before the same field related to repetition (indicated by hatching), the imaging result of the same frame is set as a motion vector detection reference. Further, even if motion vectors a and b other than 0 are respectively calculated by being generated from the imaging results of the same frame, the difference value Δ (a−b) between the motion vectors a and b is calculated. In, the value is almost 0. Further, such a difference value Δ (a−b) is very close to 0 even when the frame advance is blurred, and of course, close to 0 even when the movement of the image itself is small. Become.
[0033]
As a result, in the fields 2ODD and 4EVEN following the field in which the difference value Δ (a−b) is almost 0, it can be determined that the same field is related to repetition.
[0034]
As a result, in this embodiment, this determination method is adopted together with the determination result in the above-described accumulation comparison circuit 22 to detect the field sequence. By doing so, it is possible to prevent erroneous detection of the same field related to repetition even when the motion speed is low as compared with the related art. In addition, the determination criteria (α, β) in the comparison circuit 16 can be set more moderately to reduce the sensitivity to shaking. Even when an error occurs in the detection of a motion vector, the amount of error deviation after one field is small, so that, as described with reference to FIG. 6, one field is set as a determination target and repeated with only the motion vector c. Compared to the case where the same field is detected, erroneous detection of the same field related to repetition due to erroneous detection of motion vectors can be effectively avoided.
[0035]
Thereby, the determination circuit 27 determines the outputs of the accumulation comparison circuits 22 and 26, and the difference value Δ (Vx, Vy) of the motion vector (Vx, Vy) that is equal to or less than the determination reference value (α2, β2) in the immediately preceding field. Vy) is a case where the number β is greater than or equal to a predetermined value β1, and a field in which the number γ of motion vectors (Vx, Vy) less than or equal to the criterion (α, β) is greater than or equal to the predetermined number γ1 is detected. Are determined to be the same field related to repetition, and a field sequence detection result S1 is output.
[0036]
(1-2) Operation of the first embodiment
In the above configuration, in the field sequence detection circuit 21, the luminance signal VSY is input to the pre-filter 13 among the video signals generated by the 2-3 pull-down method, and no error occurs when detecting the motion vector. So that the bandwidth is limited. The luminance signal VSY is delayed by one frame in the subsequent frame memory 14, whereby the even field and the odd field just before corresponding to the even field and the odd field of the luminance signal VSY input to the frame memory 14, respectively. A field is generated. The corresponding set of luminance signals VSY is input to the motion vector detection circuit 15, where a motion vector (Vx, Vy) is detected every 8 × 8 pixels.
[0037]
The motion vectors (Vx, Vy) detected in this way are selected in the vicinity of 0 below the predetermined motion determination reference values (α, β) by the comparison circuit 16, and each field is selected by the accumulation comparison circuit 22. Each time, the number of motion vectors equal to or less than the motion determination reference value (α, β) is calculated, and a determination result is launched in a field where the calculated number γ is equal to or greater than a predetermined determination reference value. As a result, the field sequence detection circuit 21 detects the same field related to the repetition of the 2-3 pull-down method, in which the motion is originally 0, based on the magnitude of the motion vector.
[0038]
In the same field related to the repetition detected in this way, by detecting based on the magnitude of the motion vector, when there is little motion in the luminance signal VSY, another field is erroneously detected. It will be. In addition, if the motion determination reference values (α, β) are reduced in order to prevent such erroneous detection, the field that should be detected due to the blur due to frame advance is not detected, and this makes the camera more sensitive to the blur. . It is also affected by erroneous detection of motion vectors.
[0039]
In the field sequence detection circuit 21, in addition to the field determination based on the magnitude of the motion vector, the motion vector output from the motion vector detection circuit 15 is delayed by one field by the delay circuit 23, and the subsequent difference A circuit 24 detects a difference value between the delayed motion vector and the original motion vector. The difference value is compared with the difference value determination reference value (α2, β2) in the subsequent comparison / selection circuit 25, and the difference value equal to or less than the difference value determination reference value (α2, β2) is stored in each field in the cumulative comparison circuit 26. Calculated every time. Further, when the calculated number β is greater than or equal to the determination reference value β1, it is determined that the field is the immediately preceding field of the same field related to repetition of the 2-3 pull-down method. Thereby, the field sequence detection circuit 21 detects the immediately preceding field of the same field related to the repetition based on the difference value of the motion vector.
[0040]
The motion vector difference value for the immediately preceding field detected in this way is calculated between fields created from the same frame, so that even if there is a blur in frame advance, Even when there is movement, the value is almost zero. Thereby, in this embodiment, it is possible to reliably detect a field immediately before the same field related to repetition.
[0041]
In the field sequence detection circuit 21, the detection result by the different technique is determined by the determination circuit 27 in this way, and the same field related to repetition is detected. Therefore, in this detection result, the field sequence can be detected with higher accuracy than in the past by the amount detected by the two systems. In other words, the motion determination reference value can be set gently to reduce the sensitivity to blur by determining the field based on the motion vector difference value. In addition, even when the motion is slow and erroneously detected on the motion vector side, the same field can be correctly detected on the difference value side, and the detection accuracy can be improved. Even when an error occurs in motion vector detection, the amount of deviation due to the error is small after one field, so that the detection accuracy can be improved as compared with the conventional case.
[0042]
(1-3) Effects of the first embodiment
According to the above configuration, based on the detection of the same field related to the repetition based on the magnitude of the motion vector and the detection of the immediately preceding field of the same field based on the motion vector difference value between the fields, 2- By determining the same field related to repetition in the 3 pull-down method, the field sequence can be detected with higher accuracy than in the past.
[0043]
(2) Second embodiment
FIG. 3 is a block diagram showing a motion vector detection circuit based on the gradient method. The motion vector detection circuit 41 is applied to a device that corrects motion discontinuity in a video signal by, for example, motion interpolation using a motion vector (for example, in Japanese Patent Laid-Open Nos. 1-30957 and 3-280681). Is done.
[0044]
In this motion vector detection circuit 41, the initial deviation vector selection circuit 43 selects and outputs the initial deviation vector V0 from the already detected motion vectors recorded in the motion vector memory. Here, the initial displacement vector V0 is an initial value used when calculating the motion vector of the field to be processed. The initial displacement vector selection circuit 43 receives the already detected motion vector recorded in the motion vector memory 42 as a candidate for the initial displacement vector V0, and selects and outputs the initial displacement vector V0 from these candidates. . Here, as the candidate, in the processing target field, the motion vector of the adjacent block in which the motion vector has already been detected with respect to the motion vector detection target block (for example, faster than the processing target block in raster scanning). The motion vector of the block scanned at the time), the average value of the motion vector in the previous field, and the like are applied. The initial deviation vector selection circuit 43 selects the motion vector of each candidate with the smallest prediction error and sets it as the initial deviation vector V0.
[0045]
The gradient method computing circuit 44 computes the image data of the previous field and the target field using the initial displacement vector calculated in this way, thereby moving the motion in the processing target field with respect to the initial displacement vector V0. The vector deviation vector Va is calculated. The adder circuit 45 adds the displacement vector Va to the initial displacement vector V0, thereby calculating the motion vector V0 + Va of the processing target field.
[0046]
The memory write control circuit 46 updates the record in the motion vector memory 42 with the motion vector calculated in this way, and outputs the motion vector to an interpolation circuit (not shown). In this processing, the memory write control circuit 46 stops updating the motion vector memory 42 for the same field related to the 2-3 pull-down scheme according to the field sequence detected by the field sequence detection circuit 21.
[0047]
That is, as described with reference to FIG. 2, in the same field related to repetition of the 2-3 pull-down method, a motion vector having a value of 0 (motion vectors (c) and (h)) is originally detected. On the other hand, in the detection of a motion vector by the gradient method, a motion vector is detected on the basis of the motion vector detected in the field or the like so far. The motion vector is detected based on the motion vector. As a result, if the motion vector is detected by processing the motion vector of the same field related to such repetition in the same manner as the motion vector detected in the other field, the detection accuracy is significantly deteriorated when the motion is large. It will be.
[0048]
However, if the update of the motion vector memory 42 is stopped and the motion vector detected in the same field related to repetition is excluded from the processing target as in this embodiment, the same result is obtained with reference to the immediately preceding field. The motion vector of the field following the field can be detected, and deterioration in detection accuracy can be prevented.
[0049]
According to the configuration shown in FIG. 3, when detecting and processing a motion vector by the gradient method, the motion vector of the same field related to repetition is excluded from the processing target, thereby preventing a decrease in the detection accuracy of the motion vector. be able to.
[0050]
(3) Other embodiments
In the above-described embodiment, the case where the field sequence is detected based on the field determination results of only two systems has been described. However, the present invention is not limited to this, and the field determination results of each system are shown in FIGS. A mechanism for preventing erroneous detection may be provided using the 2-3 pull-down method regularity in which the same sequence is repeated in a 5-field cycle as described.
[0051]
In the first embodiment described above, the case of processing a luminance signal has been described. However, the present invention is not limited to this and can be widely applied to the case of processing a composite video signal.
[0052]
In the first embodiment described above, the case where the luminance signal is processed with the band limited by the prefilter has been described. However, the present invention is not limited to this, and may be omitted as necessary. .
[0053]
In the above-described embodiment, the case of processing a 60 [field / second] video signal generated by the 2-3 pull-down method in the telecine apparatus has been described. However, the present invention is not limited to this, and the field is important. The present invention can be widely applied to the processing of various video signals generated by converting the number.
[0054]
【The invention's effect】
As described above, according to the present invention, based on the detection of the same field related to the repetition based on the magnitude of the motion vector and the detection of the previous field of the same field based on the motion vector difference value between the fields. For example, by determining the same field related to the repetition in the 2-3 pull-down method, the field sequence can be detected with higher accuracy than in the past.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a field sequence detection circuit according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram for explaining the operation of the field sequence detection circuit of FIG. 1;
FIG. 3 is a block diagram showing a motion vector detection circuit according to a second embodiment of the present invention.
FIG. 4 is a schematic diagram for explaining a 2-3 pull-down method;
FIG. 5 is a block diagram showing a conventional field sequence detection circuit.
FIG. 6 is a block diagram showing a field sequence detection circuit according to another conventional example.
[Explanation of symbols]
1, 11, 21: Field sequence circuit, 2, 14: Frame memory, 15, 41: Motion vector detection circuit, 6, 16: Comparison circuit, 22, 26: Accumulation comparison circuit, 24: Difference circuit, 25 ... comparison and selection circuit

Claims (3)

In the video signal processing apparatus for detecting the same field related to repetition in the field number conversion process from the continuous field of the video signal,
Motion vector detection means for detecting a motion vector of the video signal in units of pixels or in units of predetermined blocks;
The number of motion vectors less than or equal to a motion determination reference value is calculated in field units from the motion vectors detected by the motion vector detection means, and a field in which the number is greater than or equal to the first number determination reference value is detected. Field detection means;
A difference value detecting means for detecting a difference value between motion vectors detected by the motion vector detecting means between successive fields;
Second field detection means for calculating the number of difference values equal to or less than a difference value determination reference value in field units, and detecting a field having the number equal to or greater than a second number determination reference value;
After the corresponding field is detected by the second field detecting means, the field detected by the first field detecting means when the subsequent field is detected as the corresponding field by the first field detecting means. A video signal processing apparatus comprising: a determination unit that determines that the same field is related to the repetition. In the video signal processing method for detecting the same field related to repetition in the field number conversion process from the continuous field of the video signal,
A motion vector detection step of detecting a motion vector of the video signal in pixel units or in predetermined block units;
First, the number of motion vectors equal to or less than the motion determination reference value is calculated for each field from the motion vectors detected in the motion vector detection step, and a field having the number equal to or greater than the first number determination reference value is detected. Field detection steps,
A difference value detection step for detecting a difference value between motion vectors detected in the motion vector detection step between successive fields;
Calculating a number of difference values equal to or less than a difference value determination reference value in field units, and detecting a field having the number equal to or greater than a second number determination reference value;
After the corresponding field is detected in the second field detection step, the subsequent field is detected by the first field detection step when the subsequent field is detected as the corresponding field by the first field detection step. And a determination step of determining the determined field as the same field related to the repetition. A program according to a video signal processing method according to claim 2 , wherein the program is a video signal processing method.

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