JP2011035612A - Frame rate converter and display device mounted by the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for improving the quality of an interpolation frame. <P>SOLUTION: The frame rate converter 100 which increases the number of frames of an input moving image and outputs them includes: an interpolation frame generation part 10; and an information area setting part 20. The interpolation frame generation part 10 refers to at least one of a first frame and a second frame contained in the moving image to generate an interpolation frame between these frames. The information area setting part 20 establishes an information area for superimposing and displaying predetermined information in a screen. The interpolation frame generation part 10 copies the information area in the first frame or the second frame to generate an information area of in the interpolation frame. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a frame rate conversion device that converts a frame rate by inserting an interpolation frame, and a display device equipped with the frame rate conversion device.

  In recent years, a technique for increasing the number of frames of a moving image by using a frame interpolation technique and generating a moving image with smoother and less afterimage has been put into practical use. For example, a technique of converting a moving image of 60 frames (60 Hz) per second to a moving image of 120 Hz or 240 Hz at a double speed or a quadruple speed and displaying it has been put into practical use. As a method for generating an interpolated frame, a method that uses a motion vector between consecutive frames has attracted attention (see, for example, Patent Documents 1 and 2).

  In Japan, 1Seg broadcasting has started in April 2006. One-segment broadcasting is a broadcast that uses a narrow band mainly for portable devices such as mobile phones. In one-segment broadcasting, since video is normally transmitted at 15 frames per second (15 Hz), it is highly necessary to increase the number of frames.

JP 2009-71842 A JP 2009-21868 A

  An OSD (On Screen Display) area may be set on the screen displayed on the display. For example, channel information may be displayed in an OSD area set on a screen on which a television image is displayed. In addition, when video received by one-segment broadcasting is displayed on a display of a mobile phone, radio wave status information, battery remaining amount information, and the like may be displayed in the OSD area set on the screen.

  The characters and symbols displayed in the OSD area are information with relatively little change. For example, the channel information does not change unless the channel is switched. Here, when the frame interpolation technique is applied to a video in which an OSD area is set, if an interpolation error occurs in a pixel in the OSD area, the pixel noise becomes conspicuous. This is because the OSD area is originally an area with little change, and pixel noise is more conspicuous than an area with movement.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a technique for improving the quality of an interpolation frame.

  A frame rate conversion apparatus according to an aspect of the present invention is a frame rate conversion apparatus that outputs an increased number of frames of an input moving image, and outputs at least one of a first frame and a second frame included in the moving image. With reference, an interpolation frame generating unit that generates an interpolated frame between these frames, and an information region setting unit that sets an information region for displaying predetermined information superimposed on the screen are provided. The interpolation frame generation unit generates the information area in the interpolation frame by copying the information area in the first frame or the second frame.

  Another embodiment of the present invention is a display device. This device includes the above-described frame rate conversion device and a display unit that displays an image whose frame rate has been converted by the frame rate conversion device.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, the quality of an interpolation frame can be improved.

It is a figure which shows the structure of the frame rate conversion apparatus which concerns on embodiment of this invention. It is a figure which shows the production | generation principle (double speed conversion) of an interpolation frame. It is a figure which shows the production | generation principle (4 time speed conversion) of an interpolation frame. It is a figure which shows typically four cases of the pixel generation process by the interpolation frame calculation part in case the reference invalid area | region is set in the screen. 6 is a chart summarizing four cases of pixel generation processing by an interpolation frame calculation unit. It is a figure which shows the OSD area | region which contains the channel information superimposed on a screen, and the said channel information. FIG. 6A shows channel information displayed superimposed on the screen, and FIG. 6B shows an OSD area in the screen. It is a figure which shows the display apparatus carrying the frame rate conversion apparatus which concerns on embodiment.

  FIG. 1 is a diagram showing a configuration of a frame rate conversion apparatus 100 according to an embodiment of the present invention. The frame rate conversion apparatus 100 increases the number of input moving image frames and outputs them. For example, the number of frames of a moving image is increased by 2 or 4 and output.

  The frame rate conversion apparatus 100 includes an interpolation frame generation unit 10, an information area setting unit 20, and a frame storage unit 30. These configurations can be realized by an arbitrary processor, memory, or other LSI in terms of hardware, and are realized by a program loaded in the memory in terms of software, but here, functions realized by their cooperation. Draw a block. Therefore, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  The interpolation frame generation unit 10 generates an interpolation frame between the first frame and the second frame included in the moving image. The interpolation frame generation unit 10 basically refers to both the first frame and the second frame, generates an interpolation frame between these frames, and exceptionally refers to one of the first frame and the second frame. Then, an interpolated frame between these frames is generated.

  More specific description will be given below. The interpolation frame generation unit 10 includes a motion vector detection unit 12 and an interpolation frame calculation unit 14. The motion vector detection unit 12 detects a motion vector in block units or pixel units between the first frame and the second frame. For example, pixel-by-pixel motion vectors are detected by two-stage block matching.

  In the first stage of the two-stage block matching, the first frame is divided into a plurality of blocks (for example, 8 × 8 or 16 × 16 macroblocks), and is matched with the respective blocks in the second frame or Search for the block with the smallest error.

  For example, between the target block in the first frame and the candidate block in the second frame, a difference absolute value sum or a sum of squared differences of pixels at corresponding positions included in both is obtained, and a candidate block having the smallest value is obtained. The optimal prediction block in the second frame. In addition, the candidate block having the largest number of pixels corresponding to the corresponding positions included in both the target block in the first frame and the candidate block in the second frame is determined as the optimum in the second frame. It is good also as a prediction block. Then, a motion vector between each block in the first frame and each optimum prediction block in the second frame is calculated. Thereby, the motion vector of a block unit can be detected.

  In the second stage of the two-stage block matching, motion vectors of pixels whose pixel values do not substantially match between each block in the first frame and each optimum prediction block in the second frame are obtained. Ask. For example, by using a method similar to the above-described method, a region having the same or minimum error as the pixel region in which the pixel value in each block in the first frame does not substantially match is determined in the second frame. Explore. Thereby, the motion vector of a pixel unit can be detected between the first frame and the second frame.

  The interpolation frame calculation unit 14 specifies each of the motion vectors that pass through each pixel in the interpolation frame, and at least of the pixels in the first frame and the pixels in the second frame corresponding to the start point and the end point of the motion vector. One pixel is generated with reference to one of the interpolation frames. For example, both pixels may be combined and generated, or one of the pixels may be copied and generated. In the following, a method for generating a pixel in an interpolation frame by combining both pixels will be described with reference to FIGS.

  FIG. 2 is a diagram illustrating an interpolation frame generation principle (double speed conversion). In the double speed conversion, it is necessary to insert one interpolation frame Fi between the first original frame Fo1 and the second original frame Fo2. The interpolation frame Fi is inserted at a time position obtained by dividing the time interval between the first original frame Fo1 and the second original frame Fo2.

  The pixel Pi of the interpolation frame Fi is generated by combining the pixel Po1 of the first original frame Fo1 and the pixel Po2 of the second original frame Fo2 corresponding to the start point and end point of the motion vector mv passing through the pixel Pi. . For example, the pixel values of both pixels may be averaged to calculate the pixel value of the pixel Pi in the interpolation frame Fi.

  Here, if the motion vector mv passing through the pixel Pi of the interpolation frame Fi can always be accurately obtained, the pixel Po1 of the first original frame Fo1 corresponding to the start point of the motion vector mv is directly used as the pixel Pi of the interpolation frame Fi. May be assigned. However, when the motion vector mv is erroneously detected, only one pixel Po1 is referred to, so that large noise is likely to occur. Therefore, in the present embodiment, both the pixel Po1 of the first original frame Fo1 and the pixel Po2 of the second original frame Fo2 are referred to.

  If there is no motion vector that passes through the target pixel of the interpolation frame Fi, for example, the following processing is performed. That is, a pixel spatially interpolated from surrounding pixels in the interpolation frame Fi is assigned to the target pixel, or a pixel of the first original frame Fo1 and a pixel of the second original frame Fo2 at the same position as the target pixel of the interpolation frame Fi Is assigned to the target pixel.

  FIG. 3 is a diagram showing the principle of interpolation frame generation (quadruple speed conversion). In the quadruple speed conversion, it is necessary to insert three interpolation frames (a first interpolation frame Fi1, a second interpolation frame Fi2, and a third interpolation frame Fi3) between the first original frame Fo1 and the second original frame Fo2. is there. The first interpolation frame Fi1, the second interpolation frame Fi2, and the third interpolation frame Fi3 are respectively inserted at time positions obtained by dividing the time interval between the first original frame Fo1 and the second original frame Fo2.

  The pixel Pi1 of the first interpolation frame Fi1 is generated by combining the pixel Po1 of the first original frame Fo1 and the pixel Po2 of the second original frame Fo2 corresponding to the start point and end point of the motion vector mv passing through the pixel Pi1. Is done. For example, the pixel value of the pixel Pi1 of the first interpolation frame Fi1 may be calculated by weighted averaging of both pixel values. That is, the former pixel value is 3/4, the latter pixel value is 1/4, and both are added.

  The pixel Pi2 of the second interpolation frame Fi2 can be generated in the same manner as the pixel Pi of the interpolation frame Fi shown in FIG. The pixel Pi3 of the third interpolation frame Fi3 is also generated by combining the pixel Po1 of the first original frame Fo1 and the pixel Po2 of the second original frame Fo2. For example, the pixel value of the pixel Pi3 of the third interpolation frame Fi3 may be calculated by weighted averaging of both pixel values. That is, the former pixel value is ¼, the latter pixel value is ¾, and both are added.

  Next, a case where a reference invalid area is set in the screen on which the moving image is displayed will be described. For example, the reference invalid area includes the upper and lower margin areas (for example, black belt area) in the screen displayed in the letterbox format, the left and right margin areas in the screen displayed in the pillar box format, and the window box format. Is set to the top, bottom, left, and right margin areas in the screen. These margins are inserted on the broadcast station side or the receiver side in order to ensure compatibility of images with different aspect ratios. For example, when a 4: 3 video is displayed on a 16: 9 screen, a pillar box format is adopted, and black bands are displayed on the left and right sides of the screen. The reference invalid area can be set in advance by a designer. For example, it is set to a pixel or a region where noise is likely to occur.

  Hereinafter, with reference to FIG. 4 and FIG. 5, the pixel generation processing by the interpolation frame calculation unit 14 when the reference invalid area is set in the screen will be described. FIG. 4 is a diagram schematically showing four cases of pixel generation processing by the interpolation frame calculation unit 14 when the reference invalid areas 42 a and 42 b are set in the screen 40. FIG. 5 is a table summarizing four cases of pixel generation processing by the interpolation frame calculation unit 14.

  The screen 40 shown in FIG. 4 is a pillar box format screen, and the screen 40 is divided into an effective area 41 where video is displayed and reference invalid areas 42a and 42b which are left and right margin areas. The area outside the screen 40 is handled in the same manner as the reference invalid areas 42a and 42b.

  Case a is a case where the target pixel Pia in the interpolation frame Fi, the reference pixel Po1a in the first original frame Fo1, and the reference pixel Po2a in the second original frame Fo2 are all present in the effective region 41. That is, the interpolation frame calculation unit 14 corresponds to the pixel Po1a in the first original frame Fo1 and the pixel Po2a in the second original frame Fo2 corresponding to the start point and end point of the motion vector passing through the target pixel Pia in the interpolation frame Fi. Are present in the effective area 41, the target pixel Pia is generated with reference to both the pixels Po1a and Po2a. For example, a pixel obtained by combining (for example, averaging) both the pixels Po1a and Po2a is assigned to the target pixel Pia in the interpolation frame Fi.

  Case b is a case where the target pixel Pib of the interpolation frame Fi exists in the reference invalid areas 42a and 42b. That is, when the target pixel Pib in the interpolation frame Fi exists in the reference invalid regions 42a and 42b, the interpolation frame calculation unit 14 corresponds to or matches the position of the target pixel Pib and the pixels in the first original frame Fo1. The target pixel Pib is generated with reference to at least one of the pixels in the two original frames Fo2. For example, the pixel in the original frame Fo1 is copied to the target pixel Pib in the interpolation frame Fi. Further, the pixel in the second original frame Fo2 may be copied. Further, a pixel obtained by combining (for example, averaging) the pixel in the first original frame Fo1 and the pixel in the second original frame may be copied to the target pixel Pib in the interpolation frame Fi.

  In case b, the pixel Po1b in the first original frame Fo1 and the pixel Po2b in the second original frame Fo2 corresponding to the start and end points of the motion vector passing through the target pixel Pib in the interpolation frame Fi are valid. Regardless of whether it exists in the area 41 or in the reference invalid areas 42a and 42b, none is referred to.

  In the case c, the target pixel Pic in the interpolation frame Fi exists in the effective region 41, and one of the reference pixel Po1c in the first original frame Fo1 and the reference pixel Po2c in the second original frame Fo2 exists in the effective region 41. The other is in the reference invalid areas 42a and 42b. That is, the interpolation frame calculation unit 14 corresponds to the pixel Po1c in the first original frame Fo1 and the pixel Po2c in the second original frame Fo2 corresponding to the start point and end point of the motion vector passing through the target pixel Pic in the interpolation frame Fi. Is present in the reference invalid areas 42a and 42b, the other pixel is referenced to generate the target pixel Pic. In FIG. 4, the pixel Po1c in the first original frame Fo1 existing in the reference invalid area 42a, 42b is not referred to, and the pixel Po2c in the second original frame Fo2 not present in the reference invalid area 42a, 42b is referred to. With reference, the target pixel Pic is generated. In FIG. 4, the pixel Po2c in the second original frame Fo2 that does not exist in the reference invalid areas 42a and 42b is copied to the target pixel Pic in the interpolation frame Fi.

  In the case d, the target pixel Pid in the interpolation frame Fi exists in the effective area 41, and both the reference pixel Po1d in the first original frame Fo1 and the reference pixel Po2d in the second original frame Fo2 are reference invalid areas 42a and 42b. (Including the area outside the screen 40). That is, the interpolation frame calculation unit 14 corresponds to the pixel Po1d in the first original frame Fo1 and the pixel Po2d in the second original frame Fo2 corresponding to the start point and end point of the motion vector passing through the target pixel Pid in the interpolation frame Fi. Are both present in the reference invalid regions 42a and 42b, referring to at least one of the pixels in the first original frame Fo1 and the pixels in the second original frame Fo2 corresponding to or coincident with the position of the target pixel Pid, A target pixel Pid is generated. For example, both pixels may be combined (for example, averaged) or may be generated by copying one of the pixels.

  That is, in case d, the motion vector is considered to be zero. Note that neither the pixel Po1d in the first original frame Fo1 nor the pixel Po2d in the second original frame Fo2 corresponding to the start point and end point of the motion vector passing through the target pixel Pid in the interpolation frame Fi is referred to.

  Returning to FIG. 1, the information area setting unit 20 sets an information area for displaying predetermined information superimposed on the screen, and sets the position in the interpolation frame calculation unit 14. For example, the pixel position to be the information area is set in the register in the interpolation frame calculation unit 14.

  The information area may be an OSD area. The predetermined information is expressed by letters (including numbers), symbols, icons, etc., for example, channel information, volume information, date information, time information, radio wave status information, battery remaining information, unread mail presence information, etc. Applicable. Among these, the radio wave status information, the remaining battery level information, and the unread mail presence / absence information can be displayed on the screen when the one-segment broadcasting is received and displayed by a portable device such as a cellular phone. . The information area setting unit 20 may set a plurality of information areas in one screen.

  The information area setting unit 20 sets the information area according to area information from the outside (for example, main control unit 300 in FIG. 7 described later). For example, when channel information is to be superimposed on video received by the one-segment broadcasting by the main control unit 300, the following region information is generated and notified to the information region setting unit 20. The area information includes position information indicating a position where channel information is superimposed, and frame information for specifying a frame for starting display of the channel information and a frame for ending the display. The area information is transmitted from the main control unit 300 to the information area setting unit 20 using I2C or the like.

  In the present embodiment, the information area set by the information area setting unit 20 is automatically set as the reference invalid area. Therefore, the interpolation frame calculation unit 14 refers to the pixel corresponding to the position of the target pixel in the first frame (for example, the previous frame with respect to the interpolation frame) for the target pixel included in the information area in the interpolation frame. (Case b). For example, the pixel in the first frame is copied to generate the target pixel in the interpolation frame. By executing these processes for all the pixels included in the information area in the interpolation frame, the information area in the first frame is copied to the information area in the interpolation frame. The interpolation frame calculation unit 14 refers to the pixel corresponding to the position of the target pixel in the second frame (for example, a subsequent frame to the interpolation frame) with respect to the target pixel included in the information area in the interpolation frame. It may be generated.

  In addition, the interpolation frame calculation unit 14 determines that one of the pixel in the first frame and the pixel in the second frame specified by the motion vector of the target pixel not included in the information region in the interpolation frame is in the information region. If it exists, the target pixel is generated with reference to the pixel that does not exist in the information area without referring to the pixel that exists in the information area (case c).

  In addition, the interpolation frame calculation unit 14 determines that both the pixels in the first frame and the pixels in the second frame specified by the motion vector of the target pixel not included in the information area in the interpolation frame are in the information area. If it exists, the target pixel is generated with reference to at least one of the pixel in the first frame and the pixel in the second frame corresponding to the position of the target pixel (case d). For example, both pixels may be combined (for example, averaged) or may be generated by copying one of the pixels.

  The frame storage unit 30 temporarily stores an original frame included in a moving image input from the outside and an interpolation frame generated by the interpolation frame generation unit 10 and externally (for example, a display panel) according to the display order of the frames. Output.

  FIG. 6 is a diagram showing channel information 61 displayed superimposed on the screen 60 and an OSD area 62 including the channel information 61. 6A shows the channel information 61 displayed superimposed on the screen 60, and FIG. 6B shows the OSD area 62 in the screen 60.

  In FIG. 6A, channel information 61 (here, 1ch) is displayed in the upper right corner of the screen 60. This channel information 61 is not information added by the broadcasting station side but information added afterwards by the receiver side. In FIG. 6B, a small area including the channel information 61 is set in the OSD area 62. Thereby, the small area becomes the reference invalid area.

  As described above, according to the present embodiment, when the interpolation frame is generated using the above-described interpolation frame technique using the motion vector, when the information area is set, the information area of the first frame is copied. Thus, the quality of the interpolation frame can be improved by generating the information area of the interpolation frame.

  That is, the characters, symbols, icons, etc. displayed in the information area are information with relatively little change, and the noise generated in the information area is more conspicuous than the noise generated in the area with movement. Become. For pixels in the information area having a long stationary period, it is easier to achieve high accuracy if the pixels at the same position in the previous frame are followed by the interpolation calculation using the motion vector described above. Also, if the pixel value of the previous frame is simply followed, the amount of calculation can be reduced.

  In addition, the information area is an area displaying content different from the original video, and when the pixel of the area displaying the original video is generated, the pixel included in the information area is erroneously referred to. , Noise is likely to occur. In this regard, the occurrence of the noise can be suppressed by setting the information area as the reference invalid area.

  FIG. 7 is a diagram showing a display device 500 equipped with the frame rate conversion device 100 according to the embodiment. The display device 500 is a device equipped with a function of receiving one-segment broadcasting and displaying and reproducing it. For example, it may be a one-seg broadcast reception / playback machine, or may be a mobile phone, PDA, portable music player, electronic dictionary, car navigation device, or the like equipped with the function.

  The display device 500 includes an antenna 200, a main control unit 300, a frame rate conversion device 100, and a display unit 400. Main controller 300 includes a receiver 310, a decoder 320 and a frame rate converter 330. The receiving unit 310 receives the one-segment broadcast via the antenna 200, demodulates the signal of the selected channel, and outputs the demodulated signal to the decoding unit 320.

  The decoding unit 320 decodes the encoded data input from the receiving unit 310. For encoding one-segment broadcasting images, AVC / H. H.264 standard is adopted. Decoding section 320 outputs the decoded frame to frame rate conversion section 330. Note that resolution conversion by a scaler (not shown) is actually performed before the decoded frame is input to the frame rate conversion unit 330, but is omitted here because it is not noted here.

  The frame rate conversion unit 330 simply copies the input frame to increase the number of frames. Here, each frame of a 15 Hz moving image is copied three times and the number of frames is quadrupled to convert the 15 Hz moving image into a 60 Hz moving image. Instead of simply copying, at least one frame to be increased may be generated by simply combining two consecutive original frames. For example, the upper region of one original frame and the lower region of the other original frame may be spatially combined.

  The frame rate conversion apparatus 100 performs the double speed conversion or the quadruple speed conversion on the moving image input from the frame rate conversion unit 330 using the method described in the above embodiment. Note that the information area is not double-speed converted. The display unit 400 displays the moving image that has been double-speed converted by the frame rate conversion apparatus 100.

  As described above, the image quality of the one-segment video can be improved by mounting the frame rate conversion device 100 according to the embodiment on the display device 500 that receives and displays the one-segment broadcast. 7 shows an example in which double-speed conversion of one-segment video is realized by adding the frame rate conversion device 100 to the existing main control unit 300. However, frame rate conversion is performed in the main control unit 300. Instead of the unit 330, the frame rate conversion apparatus 100 may be mounted from the beginning.

  The present invention has been described based on some embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.

  For example, in the above embodiment, a method for detecting a pixel-based motion vector by two-stage block matching has been described. However, each block in an interpolation frame is detected using a block-based motion vector obtained by one block matching. A motion vector passing through the pixel may be obtained. Further, instead of block matching, a motion vector for each pixel may be detected using a gradient method.

  In the above embodiment, an example has been described in which pixels other than the information area in the interpolation frame are generated by the interpolation calculation using the motion vector. In this regard, pixels other than the information area may be generated by combining the pixels in the first original frame and the pixels in the second original frame that correspond to or coincide with the positions of the pixels.

  In the above-described embodiment, an example in which a one-segment broadcast moving image is converted at double speed has been described. However, the frame rate conversion apparatus 100 according to the present invention is not limited to the application, and various moving image frames are used. Applicable for rate conversion. In particular, it is effective for application to moving images with a low frame rate, such as moving images taken with a low-spec camera. For example, it can also be applied to frame rate conversion of moving images of less than 15 Hz.

  DESCRIPTION OF SYMBOLS 10 interpolation frame production | generation part, 12 motion vector detection part, 14 interpolation frame calculation part, 20 information area setting part, 30 frame memory | storage part, 100 frame rate conversion apparatus, 200 antenna, 300 main control part, 310 receiving part, 320 decoding part 330 frame rate conversion unit, 400 display unit, 500 display device.

Claims (5)

A frame rate conversion device that increases the number of frames of an input moving image and outputs the frame,
An interpolation frame generation unit that generates an interpolation frame between the frames by referring to at least one of the first frame and the second frame included in the moving image;
An information area setting unit that sets an information area for displaying predetermined information superimposed on the screen, and
The frame rate conversion device, wherein the interpolation frame generation unit generates the information area in the interpolation frame by copying the information area in the first frame or the second frame. The interpolation frame generation unit
A motion vector detection unit that detects a motion vector in units of blocks or pixels between the first frame and the second frame;
The motion vector passing through each pixel in the interpolation frame is specified, and at least one of the pixel in the first frame and the pixel in the second frame corresponding to the start point and the end point of the motion vector is referred to An interpolation frame calculation unit for generating each pixel in the interpolation frame,
The interpolation frame calculation unit generates a target pixel included in the information area in the interpolation frame with reference to a pixel corresponding to the position of the target pixel in the first frame or the second frame. The frame rate conversion apparatus according to claim 1.   In the interpolation frame calculation unit, one of a pixel in the first frame and a pixel in the second frame specified by a motion vector of a target pixel not included in the information region in the interpolation frame is the information region. 3. The target pixel is generated by referring to a pixel that does not exist in the information area without referring to a pixel that exists in the information area. Frame rate conversion device.   The interpolation frame generation unit is configured to specify both a pixel in the first frame and a pixel in the second frame specified by a motion vector of a target pixel not included in the information area in the interpolation frame. The target pixel is generated with reference to at least one of the pixel in the first frame and the pixel in the second frame corresponding to the position of the target pixel. 4. The frame rate conversion device according to 2 or 3. The frame rate conversion device according to any one of claims 1 to 4,
A display unit for displaying an image whose frame rate has been converted by the frame rate conversion device;
A display device comprising:

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