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Countra-quantization method based on merging processing and apparatus thereof

An inverse quantization and type technology, applied in the field of video and image codec, can solve the problem of wasting hardware resources and achieve the effect of saving hardware resources

Inactive Publication Date: 2007-01-31
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] In the above technical solution, the inverse quantization processing of different square quantization types needs to be implemented separately, which will waste hardware resources

Method used

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  • Countra-quantization method based on merging processing and apparatus thereof
  • Countra-quantization method based on merging processing and apparatus thereof
  • Countra-quantization method based on merging processing and apparatus thereof

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Embodiment Construction

[0066] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0067] The first scheme of the method of dequantization based on merge processing of the present invention is as follows: figure 2 shown, including:

[0068] (1) Determine the dequantization type, and determine the corresponding second multiplier v according to the dequantization type, v is a constant or dequantization parameter or the result obtained by calculating the dequantization parameter, and the first multiplier u is the absolute value of the dequantization coefficient or inverse quantization coefficients;

[0069] (2) Calculate the product of u and v to get m;

[0070] (3) Using the m to perform inverse quantization processing to obtain inverse quantized transform coefficients.

[0071] The present invention is based on a specific method of the first scheme such as image 3 shown, including:

[0072] (1) Determine the type of in...

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Abstract

This invention relates to an inverse-quantization method and a device, in which, the method includes: judging the type of inverse-quantization to determine the second multiplier v, that is an constant or inverse-quantitative parameter or the result of inverse-quantitative parameter's calculating, and the first multiplier 'u' is the inverse quantized index or its modulus., Calculating the product of u and v to get m to obtain the exchange coefficient of the inverse-quantization by inverse-quantization with 'm' or the formula of mod 'f' equals 'm' plus 'y' is much greater than 'z'( |F'|=(m+y)>>z ). The device consists of obtaining and calculating modules for inverse-quantitative parameter, three multi-route selectors, a multiplier, a summator, a shifter and a saturation arithmetic module.

Description

technical field [0001] The invention belongs to the technical field of video and image encoding and decoding, and in particular relates to an inverse quantization method and device based on merging processing. Background technique [0002] Quantization is a lossy compression coding technique. Its basic principle is: the original symbol is mapped to a simpler new symbol, and the new symbol can be represented by fewer bits. Quantization technology is widely used in video signal processing and is an important technology in video coding methods. [0003] Video coding includes the following steps: prediction, transformation, quantization, scanning, and entropy coding. Quantization is to convert transform coefficients into simpler quantization coefficients, so as to achieve the purpose of data compression. Inverse quantization is the inverse process of quantization, and it is one of the key steps in video decoding. Its function is to inverse quantize the quantized coefficients ob...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/44H04N19/91
Inventor 何芸瞿艳梅李宇
Owner TSINGHUA UNIV