立你斯學習記錄

http://hdmiforum.org/wp-content/uploads/2017/01/HDMI_Forum_2.1SpecOverview_Jan2017_ZH-TW.pdf

靜態HDR-僅標題增強

靜態HDR在原始數據中，使用單一圖像描述符號，此為應用於整部電影中每個場景和每一格的折衷

動態HDR的優勢

或甚至逐格優化

動態HDR確保影像的每一刻、每一幕的場景或甚至是每一格都以其

最理想的景深、細節、明亮度、反差和更廣的色域呈現

 

https://www.smpte.org/sites/default/files/2017-01-12-ST-2094-Borg-V2-Handout.pdf

SMPTE ST  2094  and  Dynamic Metadata

https://www.smpte.org/sites/default/files/section-files/HDR.pdf

http://www.hdtvexpert.com/tag/static-hdr-metadata/

how do we signal HDR content is present? The HDMI 2.0 and DisplayPort 1.4 interface specifications allow for info frames that contain either static or dynamic metadata that tell the display how to format the HDR

images. Without this data, the display will simply render HDR images incorrectly as overly-bright, washed-out SDR images – or, very dark images with little detail.

http://www.cash.idv.tw/wordpress/?p=13643

meta data 要包括一個 display primaries 描述色域圖 (color space) 上三個點頂的座標, 以及一個白點 (white point) – 上面的色域圖中間最白的那一點就是了. 這幾個數字都要精確到四位小數.

最後 metadata 需要描述 luminance 的最大值和最小值  (單位是 cd/cm²), 需要四位數字和兩位小數. 因為影片若不包括 luminace 的訊息, 光是看到 YUV 的 10 bit 也無法反推此數字.

https://www.flatpanelshd.com/downloads/philips_hdr_white_paper.pdf

images. Without this data, the display will simply render HDR images incorrectly as overly-bright, washed-out SDR images – or, very dark images with little detail.