Method for distributing video image set bit based on H.264

A video image and bit allocation technology, applied in image communication, digital video signal modification, television, etc., can solve the problems of poor image quality, out-of-control video bit rate, different bit stream sizes, etc., and achieve stable image quality and rate distortion. Optimize and realize the effect of rate control
CN101466035BInactive Publication Date: 2011-08-17SHENZHEN TEMOBI SCI &TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHENZHEN TEMOBI SCI &TECH
Publication Date
2011-08-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A bit distribution method of groups of video pictures based on H.264 is applied to a video picture encoder which controls the code rate of video stream encoded in real time. The method comprises the following steps: A. the approximation of the quantization parameter mean QPm of a first frame in the video stream GOP is estimated and set as QPi; B. the frame I in the video stream GOP is encoded; C.the present output code rate is calculated; D. according to the code rate calculated in the step C, the QP value of the subsequent frame B or P is adjusted; E. the frame B or P is encoded; F. when the video stream is not over, the step C is executed once again; G. the video stream is over. According to the target code rate and the complexity of the picture contents, the bit distribution method reasonably determines a quantization parameter of the first frame in the groups of video pictures, thus carrying out the bit distribution on the groups of pictures; under the circumstance of one-time encoding, the optimization of the rate distortion can be well realized and the quality of the pictures is relatively stable.
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Description

technical field

[0001] The invention relates to codec technology in the field of video compression, in particular to an H.264-based image group bit allocation method. Used for rate control of real-time encoded video streams. Background technique

[0002] For real-time video communication, due to the limited bandwidth of the communication channel, it is necessary to control the bit rate of the video coding to ensure the smooth transmission of the video bit stream and the full utilization of the channel bandwidth. For different application occasions, there are various rate control strategies in the prior art. The so-called code rate control is to dynamically adjust the parameters of the encoder to obtain the target number of bits. It allocates certain bits for a video group of picture (GOP: Group Of Picture), picture or sub-picture in a video sequence. GOP is a group of images with strong time correlation. A GOP usually contains frames in three formats: I frame, P frame, an...

Claims

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