Video coding method based on self-adaptive perception quantization and video coding system thereof

Abstract

The invention discloses a video encoding method and system based on adaptive perceptual quantization, belonging to the field of video encoding and decoding processing. The invention includes determining a quantization adjustment factor according to the video image to be processed, processing the video image to be processed according to the quantization adjustment factor, obtaining a video code stream, processing the quantization adjustment factor, and combining the The above video code stream is obtained as an input code stream. By using the perceptual driving method to encode HDR video, not only can the brightness range visible to the human eye be encoded, but also effectively reduce the number of bits required for encoding, and adaptively adjust the size of the quantization interval according to the brightness range of the input HDR video , when the number of coding bits is fixed, the quantization value can be more fully utilized, the accuracy of HDR video coding can be improved, and the quantization loss can be reduced.

Description

technical field [0001] The invention belongs to the field of video codec processing, and in particular relates to a video coding method and system based on adaptive perceptual quantization. Background technique [0002] With the continuous development of broadband network and display technology, people have higher expectations for the quality of video images. Compared with ordinary video, High-Dynamic Range (HDR) video can greatly expand the contrast and color at the same time, and the bright part of the picture will be brighter, so that it can better reflect the real environment and improve the visual experience. [0003] Commonly used HDR video storage formats require a lot of storage space. Therefore, designing a new encoding method according to the characteristics of HDR video is a key issue for HDR video. The MPEG standard organization adopts Perceptual Quantizer (perceptual quantization, PQ) to convert the HDR video to adapt to the encoder of H.265 / HEVC Main10Profile...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that the PQ-based HDR video encoding method uniformly encodes a fixed and very large brightness range without considering the actual brightness range of the HDR video, so the PQ-based HDR video encoding method is in When encoding a specific HDR video, it is often impossible to make full use of the quantization value (when the number of encoding bits is fixed), and there is a quantization loss

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