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公开(公告)号：US20190335149A1
公开(公告)日：2019-10-31
申请号：US16349923
申请日：2018-02-26
Inventor： Takeshi HIROTA , Susumu MIYAJIMA , Akira YONEDA , Yoshiichiro KASHIWAGI , Toshiroh NISHIO , Masayuki KOZUKA
Abstract: A video display device includes: a video receiver that obtains video data including a video and dynamic luminance characteristics indicating a time-dependent change in luminance characteristics of the video; a tone mapping processor that, in the case where a luminance region having a luminance less than or equal to a first luminance is defined as a low luminance region, and a luminance region having a luminance exceeding the first luminance is defined as a high luminance region, (i) performs first tone mapping using first conversion characteristics when first luminance characteristics exceed a predetermined threshold value, and (ii) performs second tone mapping using second conversion characteristics when the first luminance characteristics are less than or equal to the predetermined threshold value.
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公开(公告)号：US20190342603A1
公开(公告)日：2019-11-07
申请号：US16349931
申请日：2018-02-26
Inventor： Takeshi HIROTA , Susumu MIYAJIMA , Akira YONEDA , Yoshiichiro KASHIWAGI , Toshiroh NISHIO , Masayuki KOZUKA
IPC: H04N21/431 , H04N5/20 , H04N5/66 , H04N5/92
Abstract: A luminance characteristics generation method includes: determining, for each of frames included in a video, a value as first luminance characteristics, the value being obtained by dividing the number of pixels having luminances less than or equal to a first luminance among all pixels included in the frame by the number of all the pixels included in the frame; and outputting the first luminance characteristics determined in the determining of the value.
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公开(公告)号：US20230059318A1
公开(公告)日：2023-02-23
申请号：US17785781
申请日：2020-09-30
Inventor： Yusuke MAEKAWA , Kazuhiro UEHARA , Akira YONEDA
Abstract: A control device that controls a liquid crystal display device, the control device includes: an obtainer that obtains a first video signal; a determiner that determines a first backlight value as a reference luminance of a backlight of the liquid crystal display device, using a first luminance characteristic of the first video signal; a tone map processor that performs tone mapping on the first video signal based on the first backlight value and a peak luminance displayable by the liquid crystal display device, and outputs a second video signal obtained through the tone mapping; and a generator that generates a control signal for local dimming control on the liquid crystal display device based on the first backlight value and the second video signal, and outputs the control signal to the liquid crystal display device.
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公开(公告)号：US20200236334A1
公开(公告)日：2020-07-23
申请号：US16842250
申请日：2020-04-07
Inventor： Takeshi HIROTA , Susumu MIYAJIMA , Akira YONEDA , Yoshiichiro KASHIWAGI , Toshiroh NISHIO , Masayuki KOZUKA
Abstract: A video display device includes: a video receiver that receives video data including a video and dynamic luminance characteristics indicating a time-dependent change in luminance characteristics of the video; a tone mapping processor that, in the case where a luminance region having a luminance less than or equal to a first luminance is defined as a low luminance region, and a luminance region having a luminance exceeding the first luminance is defined as a high luminance region, (i) performs first tone mapping using first conversion characteristics when first luminance characteristics exceed a predetermined threshold value, and (ii) performs second tone mapping using second conversion characteristics when the first luminance characteristics are less than or equal to the predetermined threshold value.
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