Quantization matrix selecting method, apparatus of coding and coding/decoding method and system

A technology of quantization matrix and selection device, applied in the field of communication, can solve the problems of unreasonable quantization matrix selection scheme, performance degradation of encoding and decoding process, waste of system resources, etc., and achieve the effect of saving encoding bits, stable image quality, and improving performance.

Active Publication Date: 2007-09-26
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0021] The present invention provides a quantization matrix selection method, device, encoding and decoding method and system in encoding, which are used to solve the performance degradation of the encoding and decoding proc...

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  • Quantization matrix selecting method, apparatus of coding and coding/decoding method and system
  • Quantization matrix selecting method, apparatus of coding and coding/decoding method and system
  • Quantization matrix selecting method, apparatus of coding and coding/decoding method and system

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Embodiment Construction

[0069] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0070] The quantization matrix selection method provided by the present invention predicts and determines the quantization matrix used by the current block based on the block position and the non-zero coefficient value of the adjacent block, thereby adaptively adjusting the quantization matrix in the encoding process, while improving performance , to ensure the stability of the video quality.

[0071] As shown in Figure 2, it is a schematic flow sheet of the present invention, as can be seen from the figure, the present invention comprises the following steps:

[0072] S210. Determine the position of the current coding block. If the current coding block is the starting block, use a high-precision quantization matrix to quantize the residual, otherwise go to step S220;

[0073] For the slice or image starting block in the bidirectional pr...

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Abstract

The disclosed selecting method for quantizing matrix comprises: A. determining the position of current coding block, quantizing the block with high-precise quantizing matrix if current block as the initial one, or else going to next step; B. obtaining the non-zero coefficient number predicted value (NumCoeffPred) for current block; and C. comparing the predicted value with threshold, and selecting the high-/low-precise quantizing matrix if over/lower the threshold. This invention saves coding bit, and improves coding efficiency.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for selecting a quantization matrix in encoding and an encoding and decoding method and system in image processing. Background technique [0002] Video coding uses methods such as prediction, transformation, quantization, and entropy coding to represent the original video sequence with as few bits as possible on the premise of ensuring no distortion. Currently, the most widely used and applied to most common standards is the hybrid video coding structure - the original sequence frame is first generated by intra-frame or inter-frame prediction to generate the predicted frame, and then the residual coefficient is obtained by subtracting the original frame and the predicted frame, and then The residual coefficient is transformed and quantized, and finally the quantized value is entropy encoded and written into the code stream for transmission or storage. [000...

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Application Information

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IPC IPC(8): H04N7/32H04N19/124H04N19/126
Inventor 熊联欢金欣
Owner HUAWEI TECH CO LTD
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