JP2017092851A - Interpolation ratio determination apparatus and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an artifact by considering a visual integrating effect.SOLUTION: An interpolation ratio determining apparatus 1 comprises: an interpolated frame selection unit 11 that selects an interpolated frame to be used for generating an interpolation frame from an original frame before the frame rate conversion; and an interpolation ratio determination unit 12 that determines the interpolation ratio of the interpolated frame. The interpolated frame selector 11 sets the original frame located in the future as the time direction of the interpolation frame as the reference frame, and selects the original frame included within the retention time of a past visual sense memory from the position of the reference frame and the reference frame as the interpolated frame. The interpolation ratio determination unit 12 determines a value obtained by normalizing the reciprocal of the distance from the interpolation frame position to the position of each interpolated frame as the interpolation ratio of each interpolated frame.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an interpolation ratio determination apparatus and program for determining an interpolation ratio (weighting coefficient) of an interpolated frame when performing frame interpolation by linear interpolation.

  Conventionally, a frame interpolation method based on linear interpolation is known as a general method for converting a frame rate (see, for example, Non-Patent Document 1). In this interpolation method, an interpolation frame is obtained by linear filter processing for multiplying and adding a weight (interpolation ratio) corresponding to a distance to a frame of an input video positioned before and after the interpolation frame position in the time direction. Is generated.

  As an example of the frame rate expansion using the frame interpolation method by linear interpolation, there is a frame conversion from 60 fields / second to 120 or 240 frames / second in order to make the motion of the video appear smooth on a television.

"Hi-Vision Technology", Japan Broadcasting Publishing Association, November 1988

  In a conventional frame interpolation method using linear interpolation, an interpolation frame is generated with an interpolation ratio obtained by normalizing the reciprocal of the ratio of the distance from the interpolation frame position to the position of the preceding and succeeding frames. However, since the visual integration effect is not taken into consideration, there is a possibility that an artifact in which the moving area appears as a multiple image may occur. An example of this is when watching a movie in a movie theater. In a movie theater, in order to prevent flicker particularly in peripheral vision, an image of 24 frames / second is held in zero order and irradiated multiple times. However, particularly when the subtitle scrolls from bottom to top in the end roll of a movie (when an object with high contrast moves at a speed at which it can be followed), artifacts appear that the characters appear as multiple images. This does not take into account the visual integration effect, and occurs because a plurality of frame images with different object positions are irradiated within the holding time of the visual sense memory.

  An object of the present invention made in view of such circumstances is to provide an interpolation ratio determination device and a program that can suppress artifacts by considering visual integration effects.

  In order to solve the above problems, an interpolation ratio determining apparatus according to the present invention is an interpolation ratio determining apparatus that determines an interpolation ratio of a frame to be interpolated when performing frame interpolation by linear interpolation. An interpolated frame selecting unit that selects an interpolated frame used for generating an interpolated frame from a previous original frame; and an interpolation ratio determining unit that determines an interpolated ratio of the interpolated frame. The interpolated frame selection unit uses an original frame located in the future as a time direction of the interpolation frame as a reference frame, and an original frame included in a holding time of the past visual sense memory from the position of the reference frame, And the reference frame as an interpolated frame, and the interpolation ratio determining unit calculates a value obtained by normalizing a reciprocal of a distance from the position of the interpolated frame to the position of each interpolated frame. Interpolation ratio And determining by.

  An interpolation ratio determining apparatus according to the present invention is an interpolation ratio determining apparatus that determines an interpolation ratio of an interpolated frame when performing frame interpolation by linear interpolation, and is based on an original frame before frame rate conversion. An interpolated frame selecting unit that selects an interpolated frame used for generating an interpolated frame; and an interpolation ratio determining unit that determines an interpolated ratio of the interpolated frame. The frame selection unit uses the original frame located in the future as the time direction of the interpolation frame as a reference frame, and the shutter opening ratio range within the holding time of the past visual sensory memory from the position through the shutter opening ratio range of the reference frame. The original frame including at least a part of the reference frame and the reference frame are selected as interpolated frames, and the interpolation ratio determination unit is configured to view the distance from the interpolated frame position to the position of each interpolated frame. The normalized value of the reciprocal of the value obtained by multiplying the weight of the shutter opening ratio range included in the holding time within T of sensory memory, and determines the interpolation ratio for each of the interpolation frame.

  An interpolation ratio determining apparatus according to the present invention is an interpolation ratio determining apparatus that determines an interpolation ratio of an interpolated frame when performing frame interpolation by linear interpolation, and is based on an original frame before frame rate conversion. An interpolated frame selecting unit that selects an interpolated frame used for generating an interpolated frame; and an interpolation ratio determining unit that determines an interpolated ratio of the interpolated frame. When the shutter aperture ratio is less than or equal to the threshold value, the frame selection unit uses the original frame positioned in the future as the time direction of the interpolation frame as a reference frame, and the time for holding the past visual sense memory from the position of the reference frame If the original frame included in the frame and the reference frame are selected as the interpolated frame and the shutter aperture ratio exceeds the threshold, the original frame positioned in the future as the time direction of the interpolated frame A reference frame, an original frame including at least a part of the shutter aperture ratio range within the holding time of the past visual sensory memory from a position after passing through the shutter aperture ratio range of the reference frame, and the reference frame as an interpolated frame And the interpolation ratio determination unit normalizes the reciprocal of the distance from the interpolation frame position to the position of each interpolated frame when the shutter aperture ratio is less than or equal to the threshold. It is determined as an interpolation ratio of each interpolated frame, and when the shutter aperture ratio exceeds the threshold value, the visual sensory memory retention time is set at the distance from the interpolated frame position to the position of each interpolated frame. A value obtained by normalizing the reciprocal of the weighted value of the shutter aperture ratio range included in T is determined as the interpolation ratio of each interpolated frame.

  In addition, the interpolation ratio determination device according to the present invention further includes a process selection unit that determines whether or not the shutter aperture ratio exceeds a threshold value.

  The interpolation ratio determining apparatus according to the present invention is characterized in that when the shutter aperture ratio is unknown, the shutter aperture ratio is regarded as 100%.

  A program according to the present invention causes a computer to function as the interpolation ratio determining device.

  According to the present invention, artifacts can be suppressed and the subjective image quality at the time of frame rate conversion can be improved by considering the visual integration effect.

It is a block diagram which shows the structural example of the interpolation ratio determination apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining the process of the interpolation ratio determination apparatus which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the interpolation ratio determination apparatus which concerns on the 2nd Embodiment of this invention. It is a figure explaining the process of the interpolation ratio determination apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structural example of the interpolation ratio determination apparatus which concerns on the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 shows a configuration example of an interpolation ratio determining apparatus according to the first embodiment of the present invention. The interpolation ratio determining apparatus 1 shown in FIG. 1 includes an interpolated frame selecting unit 11 and an interpolation ratio determining unit 12. The interpolation ratio determination apparatus 1 selects an interpolated frame in consideration of the visual integration effect based on the frame rate conversion information in the frame rate conversion for interpolating the frame by linear interpolation, and selects the selected interpolated frame. It is a device for determining an interpolation ratio (weighting factor).

  The frame rate conversion information is information indicating the frame rate before and after frame rate conversion.

  The interpolated frame refers to a frame used for generating an interpolated frame among frames (original frames) before frame rate conversion.

  The visual integration effect is called iconic memory. Eriksen and Collins have a visual sensory memory retention time T of about 0.1 seconds based on an experiment in which two images are presented at arbitrary time intervals. Is shown. For details, see C. W. Eriksen, J. F. Collins, “Some temporal characteristics of visual pattern perception”, Journal of Experimental Psychology, Vol. 74. Issue 4, pp. 476-484, Aug. 1967.

  The interpolated frame selection unit 11 determines the position of the interpolation frame to be interpolated for converting the frame rate from the frame rate conversion information, and determines the interpolation frame position information indicating the interpolation frame position. To the unit 12. Note that the interpolation frame position information may be input from the outside, but in the following embodiments, the interpolation frame selection unit 11 generates the interpolation frame position information.

  Further, the interpolated frame selection unit 11 uses an original frame located in the future as the time direction of the interpolated frame as a reference frame, and includes elements included in the holding time T of the past visual sense memory from the position of the reference frame. The frame and the reference frame are selected as interpolated frames. The interpolated frame information indicating the interpolated frame is output to the interpolation ratio determining unit 12.

  The interpolation ratio determination unit 12 determines the interpolation ratio of each interpolation frame based on the interpolation frame position information and the interpolation frame information input from the interpolation frame selection unit 11, and each interpolation The interpolation ratio information indicating the interpolation ratio of the frame is output to the outside of the interpolation ratio determining apparatus 1. The interpolation ratio of each interpolated frame is a value obtained by normalizing the reciprocal of the temporal distance from the position of the interpolated frame to the position of each interpolated frame.

  As a specific example, a process in the case of converting a frame rate of 24 frames / second to 120 frames / second will be described with reference to FIG.

F _{1 to} F _{5 in} FIG. 2 indicate the positions (sample positions) of each frame (original frame) of the 24 frames / second video before the frame rate conversion. When this 24 frames / second video is converted to 120 frames / second, four interpolated frames are interpolated between each original frame. That is, so that the frame is inserted into the position of each in FIG. 2 scale, the interpolation frame represents only F _I as a representative, the selection process and interpolation ratio of the interpolation frame for the interpolation frame F _I The determination process will be described.

The interpolation frame selecting unit 11, the original frame located in the future as a time direction interpolation frame F _I as shown in FIG. 2 as a reference frame, the retention time in the past visual sensory memory from the position of the reference frame The original frame included in T and the reference frame are selected as interpolated frames. The reference frame may be an original frame positioned in the future as the time direction of the interpolation frame F _I , but here, the original frame F ₄ positioned in the nearest future as the time direction of the interpolation frame F _I is defined as the reference frame. To do. In FIG. 2, T = 0.1 seconds. Since the original frames included in the past holding time T from the position of the original frame F ₄ are F ₂ and F ₃ , the original frames F ₂ , F ₃ and F ₄ are selected as the interpolation frames.

Then, the interpolation ratio determination unit 12 normalizes the reciprocal of the temporal distance from the position of the interpolation frame F _{I to} the positions of the interpolation frames F ₂ , F ₃ , and F ₄ . The interpolation ratio of the insertion frame is determined. If the temporal distance between the frames after the frame rate conversion of (1/120 sec) to 1, the temporal distance from the position of the interpolation frame F _I to the position of each of the interpolation frame F _2, F _3, F ₄ Are 7, 2, and 3, respectively. The interpolation ratio determination unit 12 normalizes the reciprocals of 1/7, 1/2, and 1/3 so that the sum is 1, and calculates F ₂ , F ₃ , and F ₄ of the interpolated frame. The interpolation ratio is determined as F ₂ : F ₃ : F ₄ = 0.146: 0.342: 0.512.

  As described above, the interpolation ratio determination apparatus 1 does not use the previous and subsequent original frames adjacent to the interpolation frame as the interpolated frame as in the conventional method, but is positioned in the future as the time direction of the interpolation frame. The original frame is set as a reference frame, and the original frame included in the holding time of the visual sense memory in the past from the position of the reference frame and the reference frame are set as an interpolated frame. Therefore, visual integration effects can be taken into account, artifacts can be suppressed, and subjective image quality during frame rate conversion can be improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 3 shows a configuration example of an interpolation ratio determining apparatus according to the second embodiment of the present invention. The interpolation ratio determination device 2 shown in FIG. 3 includes an interpolation frame selection unit 11 and an interpolation ratio determination unit 12. The interpolation ratio determination device 2 selects and selects an interpolated frame in consideration of the visual integration effect based on frame rate conversion information and shutter aperture ratio information in frame rate conversion for frame interpolation by linear interpolation. It is an apparatus for determining an interpolation ratio of an interpolated frame.

  The interpolated frame selection unit 11 determines the position of the interpolated frame to be interpolated for converting the frame rate from the frame rate conversion information. Then, based on the shutter aperture ratio information, an original frame positioned in the future as the time direction of the interpolation frame is set as a reference frame, and the past visual sensory memory retention time T from the position after passing through the shutter aperture ratio range of the reference frame. The original frame including at least a part of the shutter aperture ratio range and the reference frame are selected as the interpolated frame.

  Here, the shutter aperture ratio information is information indicating the shutter aperture ratio at the time of shooting a video before frame rate conversion. The shutter aperture ratio range refers to a range from the position of the original frame to the position obtained by multiplying the time distance from the original frame to the shutter aperture ratio.

  The interpolation ratio determination unit 12 determines each interpolation frame based on the interpolation frame position information and the interpolation frame information input from the interpolation frame selection unit 11 and the shutter aperture ratio information input from the outside. And the interpolation ratio information indicating the interpolation ratio of each interpolated frame is output to the outside of the interpolation ratio determining apparatus 2. The interpolation ratio normalizes the reciprocal of the value obtained by multiplying the distance from the position of the interpolated frame to the position of each interpolated frame by the weight of the shutter aperture ratio range included in the holding time T of the visual sense memory. Value.

  Since the shutter aperture ratio is often 50% or more, when the shutter aperture ratio information is not input or when the shutter aperture ratio is unknown, the interpolation ratio determination device 2 sets the shutter aperture ratio to 100%. It may be assumed that the processing is performed. In this case, the interpolated frame selection unit 11 uses the original frame located in the future as the time direction of the interpolated frame as a reference frame, and stores the past visual sense memory from the position after passing through the 100% aperture ratio range of the reference frame. The original frame including at least a part of the shutter aperture ratio range within the holding time T and the reference frame are selected as the interpolated frame. The interpolation ratio determination unit 12 is a value obtained by multiplying the distance from the position of the interpolation frame to the position of each interpolated frame by the weight of the 100% aperture ratio range included in the holding time T of the visual sense memory. A value obtained by normalizing the reciprocal is determined as the interpolation ratio of each interpolated frame.

  As a specific example, processing in the case of converting a video of 24 frames / second to 120 frames / second will be described with reference to FIG. FIG. 4A shows a case where the shutter aperture ratio is 100%, and FIG. 4B shows a case where the shutter aperture ratio is 50%.

F _{1 to} F _{5 in} FIG. 4 indicate the positions (sample positions) of the respective frames (original frames) of the 24 frames / second video before the frame rate conversion. When this 24 frames / second video is converted to 120 frames / second, four interpolated frames are interpolated between each original frame. That is, so that the frame is inserted into the position of each in FIG. 4 scale, the interpolation frame represents only F _I as a representative, the selection process and interpolation ratio of the interpolation frame for the interpolation frame F _I The determination process will be described.

The interpolation frame selecting unit 11, the original frame located in the future as a time direction interpolation frame F _I 4 as a reference frame, past visual from a position through the shutter opening ratio range of the reference frame The original frame in which at least a part of the shutter aperture ratio range is included within the holding time T of the subjective sense memory and the reference frame are selected as the interpolated frame. The reference frame may be an original frame positioned in the future as the time direction of the interpolation frame F _I , but here, the original frame F ₄ positioned in the nearest future as the time direction of the interpolation frame F _I is defined as the reference frame. To do. In FIG. 4, T = 0.1 seconds. 4A and 4B, since the original frames included in the past holding time T from the position of the original frame F ₄ are F ₂ and F ₃ , the original frames F ₂ , F ₃ and F ₄ are included. Select as an insertion frame.

The interpolation ratio determination unit 12 includes the distance from the position of the interpolation frame F _{I to} the positions of the interpolated frames F ₂ , F ₃ , and F ₄ within the holding time T of the visual sensory memory. A value obtained by normalizing the reciprocal of the weighted value of the shutter aperture ratio range is determined as the interpolation ratio of each interpolated frame.

In the case of FIG. 4A, the temporal distances from the position of the interpolated frame F _{I to} the positions of the interpolated frames F ₂ , F ₃ , F ₄ are ₇ , ₂ , ₃ respectively, and the reference frame F ₄ The shutter aperture ratio ranges of the interpolated frames F ₂ , F ₃ , and F ₄ included in the past 0.1 second from the position that has passed through the shutter aperture ratio range are 40%, 100%, and 100%, respectively. Therefore, the weight of the integral effect influence range is 2.5, 1, 1 which is the reciprocal thereof. The interpolation ratio determining unit 12 normalizes 1 / (7 × 2.5), 1 / (2 × 1), 1 / (3 × 1) so that the sum is 1, and calculates the interpolation frame. The interpolation ratio of F ₂ , F ₃ and F ₄ is determined as F ₂ : F ₃ : F ₄ = 0.064: 0.562: 0.374.

In the case of FIG. 4B, the temporal distances from the position of the interpolation frame F _{I to} the positions of the interpolated frames F ₂ , F ₃ , F ₄ are ₇ , ₂ , ₃ respectively, and the reference frame F ₄ The shutter aperture ratio ranges of the interpolated frames F ₂ , F ₃ , and F ₄ included in the past 0.1 second from the position after passing through the shutter aperture ratio range are 40%, 50%, and 50%, respectively. Therefore, the weight of the integral effect influence range is 2.5, 2, 2 which is the reciprocal thereof. The interpolation ratio determination unit 12 normalizes 1 / (7 × 2.5), 1 / (2 × 2), 1 / (3 × 2) so that the sum is 1, and calculates the interpolation frame. The interpolation ratio of F ₂ , F ₃ and F ₄ is determined as F ₂ : F ₃ : F ₄ = 0.120: 0.528: 0.352.

  As described above, the interpolation ratio determination device 2 selects the interpolation frame and determines the interpolation ratio in consideration of the shutter aperture ratio of the video before the frame rate conversion in addition to the visual integration effect. Therefore, the interpolation ratio determination device 2 can further improve the subjective image quality.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 5 shows a configuration example of an interpolation ratio determining apparatus according to the third embodiment of the present invention. The interpolation ratio determination device 3 illustrated in FIG. 5 includes an interpolation frame selection unit 11, an interpolation ratio determination unit 12, and a process selection unit 13. The interpolation ratio determination device 3 selects and selects the interpolated frame in consideration of the visual integration effect based on the frame rate conversion information and the shutter aperture ratio information in the frame rate conversion for interpolating the frame by linear interpolation. It is an apparatus for determining an interpolation ratio of an interpolated frame.

  The process selection unit 13 receives the shutter aperture ratio information, determines whether or not the shutter aperture ratio exceeds a threshold value, and outputs determination information indicating the determination result to the interpolated frame selection unit 11.

  When the shutter aperture ratio is less than or equal to the threshold value, the power of the spatial high-frequency component contained in the moving area of the interpolated frame is often high, and there is a high possibility that artifacts in which the edges of the moving area appear as multiple images will occur. Therefore, it is desirable to select a method with a high smoothing effect. Therefore, when the shutter aperture ratio is less than or equal to the threshold value, the same processing as in the first embodiment is performed.

  That is, when the shutter aperture ratio is less than or equal to the threshold value, the interpolated frame selection unit 11 uses the original frame positioned in the future as the time direction of the interpolated frame as the reference frame, and the past visual from the position of the reference frame. The original frame and the reference frame included in the holding time T of the subjective sensory memory are selected as the interpolated frame. Then, the interpolation ratio determination unit 12 determines a value obtained by normalizing the reciprocal of the temporal distance from the position of the interpolation frame to the position of each interpolation frame as the interpolation ratio of each interpolation frame.

  On the other hand, when the shutter aperture ratio exceeds the threshold value, the power of the spatial high-frequency component contained in the moving area of the interpolated frame is often low, and the moving area appears blurred, so select a method with a low smoothing effect. It is desirable to do. Therefore, when the shutter aperture ratio is less than or equal to the threshold value, the same processing as in the second embodiment is performed.

  That is, when the shutter aperture ratio exceeds the threshold, the interpolated frame selection unit 11 uses the original frame positioned in the future as the time direction of the interpolated frame as the reference frame, and passes through the shutter aperture ratio range of the reference frame. The original frame including at least a part of the shutter aperture ratio range within the holding time T of the past visual sense memory from the position and the reference frame are selected as the interpolated frame. Then, the interpolation ratio determination unit 12 multiplies the distance from the position of the interpolated frame to the position of each interpolated frame by multiplying the weight of the shutter aperture ratio range included in the holding time T of the visual sense memory. A value obtained by normalizing the reciprocal is determined as an interpolation ratio of each interpolated frame.

  As described above, the interpolation ratio determination device 3 determines the interpolation ratio so that the smoothing effect is high when the shutter aperture ratio is low (below the threshold) while considering the visual integration effect. When the shutter aperture ratio is high (exceeding the threshold value), the interpolation ratio is determined so that the smoothing effect does not increase. Therefore, the interpolation ratio determination device 3 can improve the subjective image quality more than the interpolation ratio determination devices 1 and 2.

  It should be noted that a computer can be suitably used to function as the above-described interpolation ratio determining devices 1, 2, 3, and such a computer realizes each function of the interpolation ratio determining devices 1, 2, 3. This can be realized by storing a program describing the processing contents in a storage unit of the computer, and reading and executing the program by the CPU of the computer. This program can be recorded on a computer-readable recording medium.

  Although the above embodiment has been described as a representative example, it will be apparent to those skilled in the art that many changes and substitutions can be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes can be made without departing from the scope of the claims. For example, a plurality of constituent blocks described in the embodiments can be combined into one, or one constituent block can be divided.

1, 2, 3 Interpolation ratio determination device 11 Interpolated frame selection unit 12 Interpolation ratio determination unit 13 Process selection unit

Claims (6)

An interpolation ratio determination device for determining an interpolation ratio of an interpolated frame when performing frame interpolation by linear interpolation,
An interpolated frame selection unit that selects an interpolated frame used for generating an interpolated frame from an original frame before frame rate conversion;
An interpolation ratio determining unit that determines an interpolation ratio of the interpolated frame,
The interpolated frame selection unit uses an original frame located in the future as a time direction of the interpolated frame as a reference frame, an original frame included in a holding time of the past visual sense memory from the position of the reference frame, and Selecting the reference frame as an interpolated frame;
The interpolation ratio determining unit determines a value obtained by normalizing a reciprocal of a distance from an interpolation frame position to each interpolated frame position as an interpolation ratio of each interpolated frame. Insertion ratio determining device. An interpolation ratio determination device for determining an interpolation ratio of an interpolated frame when performing frame interpolation by linear interpolation,
An interpolated frame selection unit that selects an interpolated frame used for generating an interpolated frame from an original frame before frame rate conversion;
An interpolation ratio determining unit that determines an interpolation ratio of the interpolated frame,
The interpolated frame selection unit uses an original frame located in the future as a time direction of the interpolated frame as a reference frame, and within a holding time of the past visual sense memory from a position through the shutter aperture ratio range of the reference frame. Selecting an original frame including at least a part of the shutter aperture ratio range and the reference frame as an interpolated frame;
The interpolation ratio determination unit calculates a reciprocal of a value obtained by multiplying the distance from the interpolation frame position to the position of each interpolated frame by the weight of the shutter aperture ratio range included in the holding time T of the visual sense memory. An interpolation ratio determining apparatus, wherein a normalized value is determined as an interpolation ratio of each interpolated frame. An interpolation ratio determination device for determining an interpolation ratio of an interpolated frame when performing frame interpolation by linear interpolation,
An interpolated frame selection unit that selects an interpolated frame used for generating an interpolated frame from an original frame before frame rate conversion;
An interpolation ratio determining unit that determines an interpolation ratio of the interpolated frame,
When the shutter aperture ratio is less than or equal to the threshold value, the interpolated frame selection unit uses the original frame positioned in the future as the time direction of the interpolated frame as a reference frame, and the past visual sense from the position of the reference frame. If the original frame included in the storage retention time and the reference frame are selected as the interpolated frame and the shutter aperture ratio exceeds the threshold, the original frame positioned in the future as the time direction of the interpolated frame As a reference frame, an original frame including at least a part of the shutter aperture ratio range within the holding time of the past visual sensory memory from the position through the shutter aperture ratio range of the reference frame, and the reference frame to be interpolated Select as frame,
When the shutter aperture ratio is less than or equal to the threshold value, the interpolation ratio determination unit calculates a value obtained by normalizing the reciprocal of the distance from the interpolation frame position to the position of each interpolation frame. When the shutter aperture ratio exceeds the threshold, the distance from the interpolation frame position to the position of each interpolated frame is included in the visual sensory memory retention time T. An interpolation ratio determination device that determines a value obtained by normalizing a reciprocal of a weighted value of the shutter aperture ratio range as an interpolation ratio of each interpolated frame.   The interpolation ratio determination apparatus according to claim 3, further comprising a process selection unit that determines whether or not the shutter aperture ratio exceeds a threshold value.   The interpolation ratio determination device according to any one of claims 2 to 4, wherein when the shutter aperture ratio is unknown, the shutter aperture ratio is regarded as 100%.   The program for functioning a computer as an interpolation ratio determination apparatus as described in any one of Claims 1-5.

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