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Video data decoding method and device

A video decoder and entropy decoding technology, applied in the field of video codec, can solve the problems of increasing bit overhead, reducing codec performance, etc., and achieve the effect of stabilizing the code rate, improving codec performance, and reducing the decline

Active Publication Date: 2019-05-14
HUAWEI TECH CO LTD
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Problems solved by technology

However, the block-level quantization parameters and the side information corresponding to the block-level offset greatly increase the bit overhead and reduce the encoding and decoding performance to a certain extent.

Method used

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  • Video data decoding method and device
  • Video data decoding method and device

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Embodiment Construction

[0149] Several terms involved in the embodiments of the present application are explained as follows:

[0150] Quantization adjustment factor: used to adjust the quantization process of the transform coefficient at the image block level, or the inverse quantization process used to adjust the quantized transform coefficient at the image block level. In the following embodiments of the present application, examples of the quantization adjustment factor include A first quantization adjustment factor, a second quantization adjustment factor, a third quantization adjustment factor, and a fourth quantization adjustment factor. It should be understood that the first quantization adjustment factor and the second quantization adjustment factor are an inverse quantization process for adjusting quantized transform coefficients at the image block level during the video decoding process, wherein the first quantization adjustment factor is adaptively calculated The initial quantization adju...

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Abstract

The invention discloses a video data decoding method and device, and the method comprises the steps: simulating the original pixel information corresponding to a current image block through employingthe spatial neighborhood pixel information of the current image block, so as to estimate the characteristics of a background region where the current image block is located. comprehensively considering the spatial neighborhood pixel information and a quantized adjustment factor adjustment parameter decoded from a code stream; adaptively deriving a second quantization adjustment factor for the current image block, and the inverse quantization process of the first transformation coefficient set corresponding to the current image block is adjusted based on the adaptively derived second quantization adjustment factor, so that the inverse quantization processing is flexibly adjusted while the stripe code rate is stabilized in the video decoding process, the quantization distortion intensity better conforms to the visual perception of human eyes, and the coding and decoding performance is improved.

Description

technical field [0001] The present application relates to the technical field of video coding and decoding, and in particular to a video data decoding method and a corresponding video decoder. Background technique [0002] Current video coding technologies include various video coding standards, such as H.264 / AVC, H.265 / HEVC, Audio Video Coding Standard (AVS) and other video coding standards. The above-mentioned video coding standards usually adopt a hybrid coding framework. The hybrid coding framework may include links such as prediction, transform, quantization, and entropy coding. In the prediction process, the reconstructed pixels (reconstructed pixels) of the coded area are used to generate predicted pixels (predicted pixels) of the original pixels (original pixels) corresponding to the current coded image block (coding block). The difference in pixel value between the original pixel and the predicted pixel is called residual. In order to improve the coding efficiency...

Claims

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Application Information

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IPC IPC(8): H04N19/124H04N19/13H04N19/137H04N19/176H04N19/48H04N19/52H04N19/91
CPCH04N19/124H04N19/13H04N19/137H04N19/176H04N19/48H04N19/52H04N19/91
Inventor 赵寅杨海涛
Owner HUAWEI TECH CO LTD
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