JP2005341181A - Output apparatus, color conversion method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an output apparatus capable of outputting a series of moving pictures with high image quality even when non-reproducible colors among colors included in a series of the moving pictures are converted into reproducible colors. <P>SOLUTION: The output apparatus for converting the non-reproducible colors among the colors included in a series of the moving pictures into the reproducible colors and outputting a series of the moving pictures includes: a color reproduction disabled frame extract section for extracting a color reproduction disabled frame being a frame including the unreproducible color by the output apparatus among the colors included in a series of the moving pictures; a first color conversion section for converting the colors of the color reproduction disabled frame into the color reproducible by the output apparatus; and a second color conversion section for converting colors of frames other than the color reproduction disabled frame on the basis of an inter-frame distance with the color reproduction disabled frame in a series of the moving pictures. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an output device, a color conversion method, and a program. In particular, the present invention converts an unreproducible color included in a series of moving images into a reproducible color and outputs a series of moving images, a color conversion method using the output device, and the output device Regarding the program.

In an output device that processes an image signal and outputs an image, there is no problem when outputting an image signal that exists within the color reproduction area of the output device, but it is outside the color reproduction area of the output device. When an image signal to be output is output, the color is crushed and the image quality is degraded. In order to solve this problem, there has been proposed an image processing method for converting an image signal existing outside the color reproduction area of the output device into an image signal within the color reproduction area (see, for example, Patent Document 1). .)
JP-A-4-180347

  The image processing method disclosed in Patent Document 1 is a method of converting image signals of all colors that can be taken by one input image into a color reproduction region of an output device. Therefore, this image processing method cannot be directly applied to a moving image. In other words, when independent color conversion is performed on a plurality of frames included in a moving image, different conversions may be performed on consecutive frames. As a result, the color of the same object in the moving image changes unnaturally, and a continuous moving image cannot be faithfully reproduced.

  SUMMARY An advantage of some aspects of the invention is that it provides an output device, a color conversion method, and a program that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.

  According to the first embodiment of the present invention, an output device that converts a color that cannot be reproduced among colors included in a series of moving images into a color that can be reproduced and outputs the series of moving images, is included in the series of moving images. A color non-reproducible frame extraction unit that extracts a color non-reproducible frame that includes a color that cannot be reproduced by the output device, and converts the color of the color non-reproducible frame into a color that can be reproduced by the output device. And a second color conversion unit that converts a color of a frame other than the non-color reproducible frame based on the inter-frame distance between the non-color reproducible frame in the series of moving images.

  The second color conversion unit performs color conversion performed on the color non-reproducible frame by the first color conversion unit on a color of a frame other than the color non-reproducible frame closer to the color non-reproducible frame in a series of moving images. Close color conversion may be performed.

  The first color conversion unit generates a gamma curve for converting the color of the non-color reproducible frame into a color that can be reproduced by the output device, and gamma-converts the color of the non-color reproducible frame. Based on the distance between frames in a series of videos with non-color-reproducible frames, multiple gamma curves used for color conversion of frames other than non-color-reproducible frames are generated, and the colors of frames other than non-color-reproducible frames are displayed. Each may be gamma converted.

  The second color conversion unit generates a gamma curve that is closer to the gamma curve generated by the first color conversion unit for frames other than the color non-reproducible frame that is closer to the color non-reproducible frame in a series of moving images. The colors of frames other than the non-reproducible frame may be subjected to gamma conversion.

  The non-color reproducible frame extraction unit is a color reproducibility unit including a color that is farthest in the color space from a color that can be reproduced by the output device among a plurality of non-color reproducible frames including a color that cannot be reproduced by the output device. Possible frames may be extracted.

  A series of videos is a video of one scene in a video consisting of continuous stories, and the color non-reproducible frame extraction unit reproduces each scene by the output device of colors included in the video of one scene. A frame including a color that cannot be reproduced is extracted as a non-color reproducible frame, the first color conversion unit converts the color of the non-color reproducible frame into a color that can be reproduced by the output device, and the second color conversion unit Based on the inter-frame distance from the non-color reproducible frame in the moving image of the scene, the colors of frames other than the non-color reproducible frame in the moving image of one scene may be converted.

  The series of moving images is a moving image of one program of the television broadcast, and the color non-reproducible frame extracting unit includes a color that cannot be reproduced by the output device among the colors included in the moving image of one program for each program. The frame is extracted as a color non-reproducible frame, the first color conversion unit converts the color of the color non-reproducible frame into a color that can be reproduced by the output device, and the second color conversion unit Based on the inter-frame distance from the non-color reproducible frame, the colors of frames other than the non-color reproducible frame in the moving image of one program may be converted.

  A series of moving images is an inter-CM moving image that is a moving image between commercials in a television broadcast, and the color non-reproducible frame extracting unit includes, for each inter-CM moving image, a color included in one inter-CM moving image. A frame including a color that cannot be reproduced by the output device is extracted as a color non-reproducible frame, and the first color conversion unit converts the color of the color non-reproducible frame into a color that can be reproduced by the output device, and the second color. The conversion unit may convert the colors of the frames other than the non-color reproducible frame in one inter-CM moving image based on the inter-frame distance from the non-color reproducible frame in one inter-CM moving image.

  According to the second aspect of the present invention, there is provided a color conversion method for converting a color that cannot be reproduced among colors included in a series of moving images into a color that can be reproduced, and the output device among colors included in the series of moving images Extracting a non-color-reproducible frame, which is a frame containing colors that cannot be reproduced by the method, converting the color of the non-color-reproducible frame to a color that can be reproduced by the output device, and a non-color-reproducible frame in a series of movies And converting the color of a frame other than the color non-reproducible frame based on the inter-frame distance.

  According to a third aspect of the present invention, there is provided a program for an output device that converts a color that cannot be reproduced among colors included in a series of moving images into a color that can be reproduced, and outputs a series of moving images. , A color non-reproducible frame extracting unit for extracting a color non-reproducible frame that is a frame including a color that cannot be reproduced by the output device among colors included in a series of moving images, and a color of the non-color reproducible frame is output to the output device A first color conversion unit that converts colors into a color that can be reproduced by a second color conversion unit that converts a color of a frame other than a color non-reproducible frame based on an inter-frame distance from a non-color reproducible frame in a series of moving images Make it work.

  Note that the above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  According to the present invention, an output device capable of outputting a series of moving images with high image quality even when the unreproducible colors included in the series of moving images are converted into colors that can be reproduced, and color conversion by the output device A method and a program for the output device can be provided.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the claimed invention, and all combinations of features described in the embodiments are inventions. It is not always essential to the solution.

  FIG. 1 shows an example of the configuration of an output device 100 according to this embodiment. The output device 100 may be a display device that displays a moving image on a display device, or may be a printing device that prints an image of a frame included in the moving image on a medium. For example, the output device 100 is a television receiver, a monitor, a printer, a lab device, or the like. Further, the output device 100 may include an information processing device such as a computer and an output device such as a monitor or a printer.

  The output device 100 according to the present embodiment converts a non-reproducible frame that is a frame including a color that cannot be reproduced from among the colors included in the moving image into a reproducible color, and further, between the frames with the color non-reproducible frame in the moving image. An object of the present invention is to output a moving image that is as faithful to the input moving image as possible within the color reproduction area of the output device 100 by converting the color of a frame other than the non-color reproducible frame according to the distance.

  The output device 100 includes a moving image input unit 102, a color non-reproducible frame extracting unit 104, a first color converting unit 106, a neighboring frame extracting unit 108, an interframe distance calculating unit 110, a second color converting unit 112, and a moving image output unit. 114.

  The moving image input unit 102 inputs a moving image from the outside. The moving image input unit 102 may be a network interface that inputs moving images via a network, a drive that reads and inputs moving images from a recording medium such as a DVD, or an antenna that receives a television broadcast. There may be.

  The color non-reproducible frame extraction unit 104 extracts a non-color reproducible frame that is a frame including a color that cannot be reproduced by the output device 100 among colors included in a series of moving images input by the moving image input unit 102. Here, the color that cannot be reproduced by the output device 100 may be a color outside the range of the gamut frame indicating the color that can be reproduced by the output device 100, or a color that cannot be reproduced by the output device 100 due to ambient light or the like. It may be.

  The neighboring frame extraction unit 108 sequentially extracts frames other than the color non-reproducible frames extracted by the color non-reproducible frame extraction unit 104. The inter-frame distance calculation unit 110 calculates the inter-frame distance between the non-color reproducible frame extracted by the non-color reproducible frame extraction unit 104 and the frame other than the non-color reproducible frame extracted by the neighboring frame extraction unit 108. calculate.

  The first color conversion unit 106 converts the color of the non-color reproducible frame extracted by the non-color reproducible frame extraction unit 104 into a color that can be reproduced by the output device 100 in the series of moving images input by the moving image input unit 102. To do. For example, the first color conversion unit 106 converts a color outside the gamut frame range to a color within the gamut frame range.

  The second color conversion unit 112 is configured to generate a non-color reproducible frame based on the inter-frame distance with the non-color reproducible frame calculated by the inter-frame distance calculation unit 110 in the series of moving images input by the moving image input unit 102. Convert the color of frames other than. Specifically, the second color conversion unit 112 converts the color of a frame other than the non-color reproducible frame based on the inter-frame distance with the non-color reproducible frame calculated by the inter-frame distance calculation unit 110. . For example, the second color conversion unit 112 is applied to the non-color reproducible frame by the first color conversion unit 106 for colors of frames other than the non-color reproducible frame closer to the non-color reproducible frame in a series of moving images. Color conversion closer to the color conversion performed.

  The moving image output unit 114 is a series of moving images in which the first color conversion unit 106 performs color conversion on the non-color-reproducible frames and the second color conversion unit 112 performs color conversion on frames other than the non-color-reproducible frames. Is output. The moving image output unit 114 may display a series of moving images on a display device, or may print a frame image included in the series of moving images on a medium.

  Note that the series of moving images input by the moving image input unit 102 is, for example, a moving image of one scene in a moving image composed of continuous stories. In this case, the color non-reproducible frame extraction unit 104 does not reproduce a frame including a color that cannot be reproduced by the output device 100 out of colors included in the moving image of one scene for each scene in the moving image including a continuous story. Extract as possible frames. Then, the first color conversion unit 106 converts the color of the non-color reproducible frame into a color that can be reproduced by the output device 100. Then, the second color conversion unit 112 converts the colors of the frames other than the color non-reproducible frame in the moving image of one scene based on the inter-frame distance from the non-color reproducible frame in the moving image of one scene. .

  The series of moving images input by the moving image input unit 102 is, for example, a moving image of one program of television broadcasting. In this case, the color non-reproducible frame extraction unit 104 extracts, as a non-color reproducible frame, for each program, a color including a color that cannot be reproduced by the output device 100 out of colors included in the moving image of one program. Then, the first color conversion unit 106 converts the color of the non-color reproducible frame into a color that can be reproduced by the output device 100. Then, the second color conversion unit 112 converts the colors of the frames other than the color non-reproducible frame in the moving image of one program based on the inter-frame distance with the non-color reproducible frame in the moving image of one program.

  The series of moving images input by the moving image input unit 102 is, for example, an inter-CM moving image that is a moving image between commercials in commercial broadcasting. In this case, the color non-reproducible frame extraction unit 104 extracts, for each inter-CM moving image, a frame including a color that cannot be reproduced by the output device 100 out of colors included in one inter-CM moving image as a non-color reproducible frame. . Then, the first color conversion unit 106 converts the color of the non-color reproducible frame into a color that can be reproduced by the output device 100. Then, the second color conversion unit 112 converts the colors of frames other than the non-color reproducible frame in one inter-CM moving image based on the inter-frame distance from the non-color reproducible frame in one inter-CM moving image.

  In another example, the series of images input by the moving image input unit 102 may be a moving image of a predetermined time. In this case, the color non-reproducible frame extraction unit 104 extracts, as a color non-reproducible frame, a color including a color that cannot be reproduced by the output device 100 among colors included in the moving image for a predetermined time for each moving image for a predetermined time. . Then, the first color conversion unit 106 converts the color of the non-color reproducible frame into a color that can be reproduced by the output device 100. Then, the second color conversion unit 112 converts the colors of the frames other than the color non-reproducible frame in the moving image for the predetermined time based on the inter-frame distance from the non-color reproducible frame in the moving image for the predetermined time.

  According to the output device 100 according to the present embodiment, the colors of frames other than the color non-reproducible frame are converted according to the inter-frame distance from the color non-reproducible frame in a series of moving images. Can be prevented from being crushed, and color conversion between adjacent frames can be prevented from changing greatly.

  2, 3, 4, and 5 show an example of a moving image color conversion method by the output device 100 according to the present embodiment. 2 shows an example of the flow of the color conversion method according to this example, FIG. 3 shows an example of a series of moving images 310 according to this example, and FIG. 4 shows a gamma curve used by the output device 100 according to this example. FIG. 5 shows an example of a color space according to this example.

  As illustrated in FIG. 3, a series of moving images 310 input by the moving image input unit 102 includes a color non-reproducible frame 302 that is a frame including a color that cannot be reproduced by the output device 100, and a color that cannot be reproduced by the output device 100. With no frames 300, 304, 306, and 308.

  As shown in FIG. 4, the output device 100 converts the colors of the frame 300, the color non-reproducible frame 302, the frame 304, the color non-reproducible frame 306, and the frame 308 to the gamma curve 400, gamma curve 402, gamma Gamma conversion is performed using the curve 406 or the gamma curve 408. Note that if the series of moving images 310 does not include a color that cannot be reproduced by the output device 100, the output device 100 converts the input data value to the output data value using the gamma curve 408. That is, the color that cannot be reproduced by the output device 100 in the present embodiment is a color that is equal to or higher than the input data value A that cannot be reproduced by the gamma curve 408 normally used by the output device 100 and is crushed.

  Further, as illustrated in FIG. 5, the output device 100 can reproduce colors existing within the color reproduction area 500 and cannot reproduce colors outside the color reproduction area 500. For example, the color 312 included in the non-color reproducible frame 302, the color 314 included in the non-color reproducible frame 306, and the like cannot be reproduced.

  Hereinafter, the color conversion method according to this example will be described along the flow of the color conversion method shown in FIG. 2 with reference to FIGS. 3, 4, and 5. First, the color non-reproducible frame extraction unit 104 detects a color non-reproducible frame that is a frame including a color that cannot be reproduced by the output device 100 among the colors included in the series of moving images 310 input by the moving image input unit 102. (S200). When there is no non-color reproducible frame in the series of moving images 310 (S202-N), this flow ends. In this case, the output device 100 reproduces and outputs the frames included in the series of moving images 310 using the gamma curve 408 that is normally used.

  On the other hand, when there are non-color reproducible frames in the series of moving images 310 (S202-Y), the non-color reproducible frame extraction unit 104 includes a plurality of non-color reproducible frames including colors that cannot be reproduced by the output device 100. Thus, a color non-reproducible frame including a color having the longest distance in the color space is selected and extracted from colors that can be reproduced by the output device 100 (S204).

  For example, when a series of moving images 310 includes a color non-reproducible frame 302 including a color 312 that cannot be reproduced by the output device 100 and a color non-reproducible frame 306 including a color 314 that cannot be reproduced by the output device 100. As shown in FIG. 5, the distance from the color reproduction area 500 to the color 312 is compared with the distance from the color reproduction area 500 to the color 314 in the color space. Then, the color non-reproducible frame extraction unit 104 extracts the color non-reproducible frame 302 including the color 312 farther from the color reproduction region 500.

  Next, the first color conversion unit 106 converts the color of the non-color reproducible frame extracted by the non-color reproducible frame extraction unit 104 into a color that can be reproduced by the output device 100 (S206). Specifically, the first color conversion unit 106 generates a gamma curve that converts the color of the non-color reproducible frame extracted by the non-color reproducible frame extraction unit 104 into a color that can be reproduced by the output device 100 to reproduce the color. Gamma-convert impossible frame color. For example, the first color conversion unit 106 generates a gamma curve 402 for converting the color of the color non-reproducible frame 302 into a color that can be reproduced, and performs gamma conversion of the color of the non-color reproducible frame 302.

  Next, the inter-frame distance calculation unit 110 is a frame between the non-color reproducible frame extracted by the non-color reproducible frame extraction unit 104 and a frame other than the non-color reproducible frame extracted by the neighboring frame extraction unit 108. An inter-distance is calculated (S208). For example, the inter-frame distance calculation unit 110 performs an inter-frame distance between the non-color reproducible frame 302 and the frame 300, an inter-frame distance between the non-color reproducible frame 302 and the frame 304, and a non-color reproducible frame 302 and a color reproducibility. The inter-frame distance between the possible frame 306 and the inter-frame distance between the non-color reproducible frame 302 and the frame 308 are calculated.

  Next, based on the inter-frame distance from the non-color-reproducible frame extracted by the non-color-reproducible frame extraction unit 104 in the series of moving images 310, the second color conversion unit 112 determines the frames other than the non-color-reproducible frames. The color is converted (S210). Specifically, the second color conversion unit 112 calculates a plurality of gamma curves used for color conversion of frames other than the color non-reproducible frame based on the inter-frame distance in the series of moving images 310 with the color non-reproducible frame. Generate and gamma-convert the colors of frames other than those that cannot be reproduced. At this time, the second color conversion unit 112 performs a gamma closer to the gamma curve generated by the first color conversion unit 106 for frames other than the color non-reproducible frames closer to the non-color reproducible frames in the series of moving images 310. A curve is generated, and the colors of frames other than the non-color reproducible frame are gamma-converted.

  For example, the second color conversion unit 112 uses the color conversion of the frames 300 and 304 having the closest inter-frame distance to the color non-reproducible frame 302 closest to the gamma curve 402 used for the color conversion of the non-color reproducible frame 302. This is performed using the gamma curve 400. In addition, the second color conversion unit 112 uses the color conversion of the frame 306 whose distance from the non-color reproducible frame 302 is the second closest to the frames 300 and 304 for the color conversion of the non-color reproducible frame 302. This is performed using a gamma curve 406 that is closest to the gamma curve 400 next to 402. Further, the second color conversion unit 112 performs the color conversion of the frame 308 having the longest inter-frame distance from the non-color reproducible frame 302 and the gamma curve farthest from the gamma curve 402 used for color conversion of the non-color reproducible frame 302. 408.

  S200 to S210 are repeated until there is no non-color reproducible frame in the series of moving images 310 that have undergone color conversion in S200 to S210, so that the colors of the frames of all frames included in the series of moving images 310 can be reproduced. Convert color.

  As described above, after the color of the non-color reproducible frame is converted to a color that can be reproduced by the output device 100, the color of the frame other than the non-color reproducible frame in the series of moving images By converting according to the distance, even if the same object exists in a frame in which the color is not reproducible and a frame having a short inter-frame distance, it is possible to prevent the color from being greatly changed. In addition, in a frame with a long inter-frame distance from a non-color reproducible frame, the influence of color conversion of the non-color reproducible frame can be reduced, so that a high-contrast moving image can be faithfully reproduced.

  FIG. 6 shows an example of a hardware configuration of the output device 100 according to the present embodiment. The output device 100 includes a CPU peripheral unit having a CPU 1505, a RAM 1520, a graphic controller 1575, and a display device 1580 connected to each other by a host controller 1582, and a communication interface connected to the host controller 1582 by an input / output controller 1584. 1530, an input / output unit including a hard disk drive 1540 and a CD-ROM drive 1560, and a legacy input / output unit including a ROM 1510 connected to an input / output controller 1584, a flexible disk drive 1550, and an input / output chip 1570.

  The host controller 1582 connects the RAM 1520 to the CPU 1505 and the graphic controller 1575 that access the RAM 1520 at a high transfer rate. The CPU 1505 operates based on programs stored in the ROM 1510 and the RAM 1520 and controls each unit. The graphic controller 1575 acquires image data generated by the CPU 1505 or the like on a frame buffer provided in the RAM 1520 and displays it on the display device 1580. Alternatively, the graphic controller 1575 may include a frame buffer that stores image data generated by the CPU 1505 or the like.

  The input / output controller 1584 connects the host controller 1582 to the communication interface 1530, the hard disk drive 1540, and the CD-ROM drive 1560, which are relatively high-speed input / output devices. The communication interface 1530 communicates with other devices via a network. The hard disk drive 1540 stores programs and data used by the CPU 1505 in the output device 100. The CD-ROM drive 1560 reads a program or data from the CD-ROM 1595 and provides it to the hard disk drive 1540 via the RAM 1520.

  The input / output controller 1584 is connected to the ROM 1510, the flexible disk drive 1550, and the relatively low-speed input / output device of the input / output chip 1570. The ROM 1510 stores a boot program that the output device 100 executes at startup, a program that depends on the hardware of the output device 100, and the like. The flexible disk drive 1550 reads a program or data from the flexible disk 1590 and provides it to the hard disk drive 1540 via the RAM 1520. The input / output chip 1570 connects various input / output devices via a flexible disk drive 1550 and, for example, a parallel port, a serial port, a keyboard port, a mouse port, and the like.

  A program provided to the hard disk drive 1540 via the RAM 1520 is stored in a recording medium such as the flexible disk 1590, the CD-ROM 1595, or an IC card and provided by the user. The program is read from the recording medium, installed in the hard disk drive 1540 in the output device 100 via the RAM 1520, and executed by the CPU 1505. A program installed and executed in the output device 100 works on the CPU 1505 or the like to cause the output device 100 to function as the output device 100 described with reference to FIGS.

  The program shown above may be stored in an external storage medium. As the storage medium, in addition to the flexible disk 1590 and the CD-ROM 1595, an optical recording medium such as a DVD or PD, a magneto-optical recording medium such as an MD, a tape medium, a semiconductor memory such as an IC card, or the like can be used. Further, a storage device such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet may be used as a recording medium, and the program may be provided to the output device 100 via the network.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

2 is a diagram illustrating an example of a configuration of an output device 100. FIG. It is a figure which shows an example of the flow of a color conversion method. It is a figure showing an example of a series of animation 310. It is a figure which shows an example of the gamma curve which the output device 100 uses. It is a figure which shows an example of color space. 2 is a diagram illustrating an example of a hardware configuration of an output device 100. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Output device 102 Movie input part 104 Color non-reproducible frame extraction part 106 1st color conversion part 108 Neighboring frame extraction part 110 Interframe distance calculation part 112 2nd color conversion part 114 Movie output part

Claims (10)

An output device that converts a color that cannot be reproduced among colors included in a series of videos into a color that can be reproduced, and outputs the series of videos,
A color non-reproducible frame extracting unit that extracts a color non-reproducible frame that is a frame including a color that cannot be reproduced by the output device among the colors included in the series of moving images;
A first color conversion unit that converts the color of the non-color reproducible frame into a color that can be reproduced by the output device;
An output device comprising: a second color conversion unit configured to convert a color of a frame other than the non-color reproducible frame based on an inter-frame distance from the non-color reproducible frame in the series of moving images. The second color conversion unit converts the color of a frame other than the non-color reproducible frame closer to the non-color reproducible frame in the series of moving images into the non-color reproducible frame by the first color conversion unit. The output device according to claim 1, wherein color conversion closer to the applied color conversion is performed. The first color conversion unit generates a gamma curve for converting the color of the non-color reproducible frame into a color that can be reproduced by the output device, and gamma-converts the color of the non-color reproducible frame;
The second color conversion unit generates a plurality of gamma curves used for color conversion of frames other than the color non-reproducible frame based on a distance between frames in the series of moving images with the color non-reproducible frame. The output device according to claim 1, wherein the colors of frames other than the color non-reproducible frame are each subjected to gamma conversion. The second color conversion unit has a gamma curve closer to the gamma curve generated by the first color conversion unit for frames other than the color non-reproducible frame closer to the color non-reproducible frame in the series of moving images. The output device according to claim 3, wherein gamma conversion is performed for each of the colors of the frames other than the non-color reproducible frame. The color non-reproducible frame extraction unit includes a plurality of non-color reproducible frames including colors that cannot be reproduced by the output device, and color reproduction including a color that is farthest in the color space from a color that can be reproduced by the output device. The output device according to claim 1, wherein an impossible frame is extracted. The series of videos are videos of one scene in a video consisting of continuous stories,
The color non-reproducible frame extraction unit extracts, as the non-color reproducible frame, a frame including a color that cannot be reproduced by the output device among colors included in the moving image of the one scene for each scene.
The first color conversion unit converts the color of the non-color reproducible frame into a color that can be reproduced by the output device;
The second color conversion unit converts a color of a frame other than the non-color reproducible frame in the moving image of the one scene based on an inter-frame distance from the non-color reproducible frame in the moving image of the one scene. The output device according to claim 1. The series of videos are videos of one program of a television broadcast,
The color non-reproducible frame extraction unit extracts, as the non-color reproducible frame, a frame including a color that cannot be reproduced by the output device among colors included in the moving image of the one program for each program.
The first color conversion unit converts the color of the non-color reproducible frame into a color that can be reproduced by the output device;
The second color conversion unit converts colors of frames other than the non-color reproducible frame in the moving image of the one program based on an inter-frame distance from the non-color reproducible frame in the moving image of the one program. The output device according to claim 1. The series of videos is an inter-CM video that is a video between a commercial and a commercial in a television broadcast,
The non-color reproducible frame extraction unit extracts, as the non-color reproducible frame, a frame including a color that cannot be reproduced by the output device from among colors included in the single inter-CM moving image. ,
The first color conversion unit converts the color of the non-color reproducible frame into a color that can be reproduced by the output device;
The second color conversion unit converts a color of a frame other than the non-color reproducible frame in the one inter-CM video based on an inter-frame distance from the non-color reproducible frame in the one inter-CM video. The output device according to claim 1. A color conversion method that converts unreproducible colors in a series of videos into reproducible colors,
Extracting a color non-reproducible frame that is a frame including a color that cannot be reproduced by the output device among the colors included in the series of moving images;
Converting the color of the non-color reproducible frame to a color that can be reproduced by the output device;
Converting a color of a frame other than the non-color reproducible frame based on an inter-frame distance from the non-color reproducible frame in the series of moving images. A program for an output device that converts a color that cannot be reproduced among colors included in a series of moving images into a color that can be reproduced, and outputs the series of moving images,
The output device;
A color non-reproducible frame extraction unit that extracts a color non-reproducible frame that is a frame including a color that cannot be reproduced by the output device among colors included in the series of moving images;
A first color conversion unit that converts the color of the non-color reproducible frame into a color that can be reproduced by the output device;
A program that functions as a second color conversion unit that converts a color of a frame other than the non-color reproducible frame based on an inter-frame distance from the non-color reproducible frame in the series of moving images.

Images