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This article mainly introduces the meaning of bd and hd in the computer. It is very detailed and has a certain reference value. Friends who are interested must read it!

HD refers to an image or video with a vertical resolution greater than or equal to 720, also known as high-definition video, and its dimensions are generally "1280 × 720" and "1920 × 1080". BD refers to Blu-ray Disc (Blu-ray Disc), which is used to store high-quality audio and video as well as high-capacity data. BD is clearer than HD.

HD refers to high definition, if the resolution exceeds 720p, it is high definition. BD refers to a Blu-ray disc with a resolution of 1080p. The only difference between HD and BD is that BD is clearer than HD.

DVD gives unparalleled audio-visual enjoyment in the VCD era, but with the progress of technology and the continuous follow-up of human needs, people put forward higher requirements for the quality of video. Usually the format with a physical resolution of more than 720p is called high definition, and the English expression High Definition, referred to as HD, the so-called full high definition (Full HD), refers to progressive scanning with a physical resolution of up to 1920 × 1080, that is, 1080p HD, which is the top HD specification.

HD refers to an image or video with a vertical resolution greater than or equal to 720. it is also known as high-definition image or high-definition video, and its dimensions are generally 1280 × 720 and 1920 × 1080. the full name of "high definition" is "high definition".

HD has three display formats: 720p (1280 × 720, non-interlaced, field frequency is 24, 30 or 60); 1080i (1920 × 1080, interlaced, field frequency 60); 1080p (1920 × 1080, non-interlaced, field frequency is 24 or 30)

Blu-ray Disc (BD) is one of the next generation optical disc formats after DVD, which is used to store high-quality audio and video as well as high-capacity data storage.

Blu-ray discs are named because they use blue-purple lasers with wavelength 405nm (nanometer) for reading and writing operations (DVD discs use red lasers with wavelength 650nm for reading and writing, while CD discs use near-infrared invisible lasers with wavelength 780nm for reading and writing data). A single-layer Blu-ray disc has a capacity of 25 or 27GB, enough to record a high-resolution video for up to 4 hours. On February 19th, 2008, HD DVD leader Toshiba announced that it would withdraw from all HD DVD-related businesses at the end of March, which officially ended the dispute over the next-generation optical disc format for many years, and the Blu-ray Disc dominated by SONY finally won. The Blu-ray disc uses the gamut space of YCbCr, uses chromaticity sampling (chroma subsampling) at 4:2:0, and the color depth is 8bit.

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