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Method and device used for determining optimal quantization value in RDOQ process

A quantized value and optimal technology, applied in the field of video coding, can solve the problems of high coding complexity and long coding time, and achieve the effect of saving coding time, improving efficiency, and reducing coding rate and complexity.

Active Publication Date: 2016-07-27
ZHEJIANG DAHUA TECH CO LTD
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Problems solved by technology

[0018] Embodiments of the present invention provide a method and device for determining the optimal quantization value in the rate-distor

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  • Method and device used for determining optimal quantization value in RDOQ process
  • Method and device used for determining optimal quantization value in RDOQ process
  • Method and device used for determining optimal quantization value in RDOQ process

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Embodiment Construction

[0111] In order to solve the problem of complex encoding and too long encoding time in the existing RDOQ process, the present invention provides a method for determining the optimal quantization value in the RDOQ process, and sequentially obtains each transform coefficient in the unit to be encoded according to the preset scanning order The maximum quantization value of A max , and based on the respective maximum quantization values ​​obtained A max Generate corresponding candidate quantization value sets respectively; sequentially convert the maximum quantization value A of each transform coefficient in the scanning order max Compare with the preset first threshold value; every comparison, if the maximum quantization value A of the currently selected transform coefficient is determined ma× is less than the preset first threshold, calculate the encoding cost of each candidate quantization value in the corresponding candidate quantization value set, and use the candidate quant...

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Abstract

The present invention relates to the field of video coding, in particular to a method and device for determining the optimal quantization value in the process of rate-distortion optimization and quantization RDOQ, so as to achieve the purpose of reducing coding complexity and saving coding time. The method is as follows: according to the current The maximum quantization value of the transform coefficients selectively reduces the number of candidate quantization values, gives a threshold for early termination of the rate-distortion optimization quantization process of the transform coefficients, and completely skips the rate-distortion optimization quantization process when the maximum quantization value is greater than a certain threshold, directly The maximum quantization value of the current transform coefficient is used as the optimal quantization value, so it will not increase the calculation amount of the encoding process or modify the decoding end, and reduce the encoding bit rate and complexity while hardly affecting the video quality, so as to save encoding time Purpose.

Description

technical field [0001] The invention relates to the field of video coding, in particular to a method and a device for determining an optimal quantization value in the process of rate-distortion optimization quantization RDOQ. Background technique [0002] In various image and video lossy coding technologies, such as Joint Photographic Experts Group (JPEG), Moving Picture Experts Group (Moving Picture Experts Group, MPEG-2), H.264, etc., quantization technology is to remove image and video redundancy. The key technology, through which the purpose of compressing images and videos can be achieved. However, quantization techniques introduce coding artifacts that result in lower quality reconstructed images and videos. Therefore, how to reduce the distortion effect caused by quantization while improving the compression efficiency of coding is the core issue of video coding research. [0003] The rate-distortion optimization method can effectively balance the two factors of imag...

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Application Information

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IPC IPC(8): H04N19/147H04N19/12H04N19/157
Inventor 刘星宇陈渝林聚财张兴明
Owner ZHEJIANG DAHUA TECH CO LTD
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