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Quantization coefficient differential coding adapted to the number of coefficients

A technology of coefficients and numbers, applied in the field of digital video compression

Inactive Publication Date: 2014-05-14
朱洪波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Since the complexity of video content varies greatly, it is not an efficient method to directly force an image or segment to only change the QP above a certain size.

Method used

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  • Quantization coefficient differential coding adapted to the number of coefficients
  • Quantization coefficient differential coding adapted to the number of coefficients
  • Quantization coefficient differential coding adapted to the number of coefficients

Examples

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Embodiment Construction

[0032] Figure 13 Shown is a schematic diagram of a Laplacian quantization matrix. The element at coordinates (i,j) is ρ t ,t=min(7,i+j). In this embodiment, 8 fixed quantization matrices are agreed between the encoder and the decoder, numbered 0 to 7, where the number i has ρ=1.03041×1.02123 i . However, the present invention does not limit the form of the quantization matrix. Then the encoder and decoder agree on T=3, Q=8. But the present invention is not limited thereto, and the present invention only limits that T and Q must be greater than or equal to 2.

[0033] Figure 14 is a video encoder incorporating the present invention. The encoder first divides the input video frame into LCUs, and then encodes the LCUs sequentially from left to right and top to bottom. For each LCU, the encoder splits it into CUs for encoding. Through the selection of prediction and transformation methods, the encoder obtains a series of DCT transformation blocks that need to be quantiz...

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Abstract

The invention discloses a quantization coefficient encoding method used for predicting a residual error transformation coefficient in a video signal. In the method, a selection signal of dQP and a selection signal of a quantization matrix are determined by the number of transformation quantization coefficient and are transmitted after the transformation quantization coefficient. An encoder and a decoder define a constant threshold value. If the number of nonzero quantization coefficients of a plurality of continuous transformation blocks is more than the threshold value, the encoder encodes a selection signal of the dQP or the quantification matrix in a code stream after encoding the nonzero quantization coefficients, wherein the selection signal indicates the QP or the quantification matrix used by the plurality of continuous transformation blocks. Thus, the decoder may calculate the number of the nonzero quantization coefficients so as to accurately decode the selection signal of the dQP or the quantification matrix.

Description

technical field [0001] The invention belongs to the field of digital video compression, and in particular relates to the encoding of quantization parameters of video signal prediction residual transform coefficients. Background technique [0002] Digital video is obtained through continuous sampling in time domain and space domain of the natural scene with continuous time domain and space domain. like figure 1 As shown, the digital video is composed of a series of video frames in the time domain, and each video frame represents the spatial domain sampling of the natural scene at a certain time, which is composed of two-dimensional uniformly sampled visual pixels. Each pixel consists of a series of numbers describing the brightness and color of the pixel. In video coding, the most widely used format is the YUV format. In this format, each pixel consists of a brightness component Y, two color difference components U and V composition, generally the U and V components are dow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/124H04N19/61H04N19/625
Inventor 朱洪波
Owner 朱洪波
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