High-definition Blu-ray Disc (BD) is the next generation of high-quality audio-visual storage optical disc media after DVD. Generally, short-wavelength blue laser is used to read and write data.

Blu-ray is a new generation of storage technology advocated by Sony, mainly to solve the problem of too small DVD capacity. Blu-ray movies have a minimum memory of 25G, which is more than five times larger than DVD. Because Blu-ray has a very large capacity and can store more data, it is second to none in high-definition images. That is to say, Blu-ray video is clearer and looks more comfortable than ordinary HD video images.

Sharpness refers to the sharpness of every detail shadow and its boundary on the image. Sharpness, generally from the perspective of video recorder, compares the image quality by paying attention to the sharpness of the image, so the word sharpness is often used. A camera generally uses the word resolution to measure its ability to "decompose scene details".

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