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Adaptive Quantization Parameter Control Method and Device

A technology of adaptive quantization and quantization parameters, applied in the field of communication, can solve problems such as over-adjustment of quantization parameters, uneven coding quality between macroblocks, etc.

Active Publication Date: 2017-10-20
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, during adaptive quantization, the amount of upward adjustment of quantization parameters is much greater than the amount of downward adjustment, resulting in over-adjustment of quantization parameters, which eventually leads to uneven coding quality between macroblocks

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  • Adaptive Quantization Parameter Control Method and Device
  • Adaptive Quantization Parameter Control Method and Device
  • Adaptive Quantization Parameter Control Method and Device

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Embodiment Construction

[0056]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0057] The relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0058] At the same time, it should be understood that, for the convenience of de...

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Abstract

The invention discloses an adaptive quantization parameter control method and device. Wherein, in the adaptive quantization parameter control method, according to the complexity of the image, a target number of bits is assigned to a coded image. For the jth macroblock in the frame, calculate the quantization control parameter of the jth macroblock according to the occupancy rate dj of the buffer after the encoding of the first j-1 macroblocks is completed. The reference quantization parameter of the jth macroblock is calculated by using the quantization control parameter Qj. Using the quantization parameter of the j-1th macroblock and the reference quantization parameter of the jth macroblock, determine the quantization parameter of the jth macroblock. By adaptively adjusting the quantization parameters, the over-adjustment of the quantization parameters in the code rate control is better avoided, and the coding quality between the macroblocks in the same picture is evened out.

Description

technical field [0001] The invention relates to the communication field, in particular to an adaptive quantization parameter control method and device. Background technique [0002] H.264 is a new generation of video compression standard, and its compression efficiency is better than previous standards under the same image quality. In order to match the constantly changing output code rate of the H.264 encoder with the channel, a code rate control method needs to be introduced. The code rate control method directly adjusts the output code rate of the video encoder according to the fixed or variable transmission rate of the channel to match the transmission bandwidth and obtain the minimum decoding distortion. The TM5 algorithm is a classic code rate control method, with accurate control and simple implementation. However, the existing TM5 code rate control method has inappropriate and uneven adjustments to the quantization parameters during adaptive quantization, so that s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/176H04N19/124H04N19/136
Inventor 陈云海张萍刘晓玲林立宇铁兵赖楚麟朱凯魏来
Owner CHINA TELECOM CORP LTD