Xiaomi explains in detail the HDR format of Dolby Vision

The Xiaomi 2021 spring new product launch conference was held on March 29/30, and four mobile phones of Xiaomi 11 Pro/Ultra / Youth Edition and Xiaomi MIX FOLD were released. These models all support the Dolby Vision format, which can bring better video performance.

Xiaomi published an article today detailing the HDR format of Dolby Vision. Generally speaking, this format means that a single pixel records a larger amount of information provides a higher dynamic range and a wider color gamut, theoretical brightness up to 10000nit, and supports 12bit color depth.

The current mainstream mobile phones have popularized high refresh rate screens, and many flagship models also support 8K resolution video shooting. The Dolby Vision HDR format complements the last shortcoming of picture quality. Xiaomi said that due to the limitations of traditional video transmission and theater standards, most of the video content we see at present has been produced and played back in a narrow color gamut and brightness range for a long time, such as the most common ones currently.

In the SDR standard, TV and Blu-ray content have a maximum brightness of 100 nits and minimum brightness of 0.117 nits. However, the color and brightness range of the natural world is wider than the color and brightness range supported by most current broadcast, blue light, and cinema systems, and the brightness gap between bright and dark parts has reached 100 times.

Moreover, the upper limit of SDR content is lower than the brightness that the current playback device can provide. When the playback device is displaying SDR content, the simple solution is to simply and roughly stretch the brightness, the surface brightness is increased, but the black field display is worse, high brightness part still has no details.

Besides, the most important point of Dolby Vision is to support dynamic metadata. Dynamic metadata is the ability to individually set the most appropriate brightness, contrast, color, and other picture effects for each scene of the video content in the unit of the scene, instead of using a fixed parameter throughout. This is also Dolby Vision and the most important difference in HDR10 format.

Furthermore, Dolby Vision can help content creators meticulously grade each scene of film and television dramas to realize their creative intentions. Dolby Vision format content has the application of Dolby Vision technology in production, distribution, and terminal playback.

On the other side, the screens equipped with Mi 11 Pro and Mi 11 Ultra have a peak brightness of 1700nit, support 10bit color, and have a 2K resolution + 120Hz refresh rate, which can well realize the playback of Dolby Vision format content. The Xiaomi Mi 11 Youth Edition has an FHD+ resolution and a global brightness of 800nit, but it also supports P3 wide color gamut and a 1.07 billion color display.

|VIA|