Code rate control method for subtle granule telescopic code based on H.264
A rate control and encoding technology, applied in the field of video encoding, can solve problems such as limited buffer capacity
Inactive Publication Date: 2006-02-22
SHANGHAI UNIV +1
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However, when the code rate changes for a long period of time, if the cache method is still used due to the limited buffer capacity, it will be difficult to work
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[0070] An embodiment of the invention is:
[0071] see figure 1 , the control method of fine-grained scalable coding based on H.264 / AVC is to combine the two code streams of the base layer stream and the enhanced layer stream at the encoder end, and adopt the fine-grained scalable coding based on H.264 / AVC The code rate control method generates a code stream file at the receiving end, and realizes that only one code stream file and a very small amount of enhancement layer coding information need to be transmitted; the steps are:
[0072] (1) Fine-grained scalable coding based on H.264 / AVC: adaptively select quantization parameters according to the result of rate distortion, and encode the total bit stream;
[0073] (2) Base layer flow rate control: perform group-of-picture rate control on the base layer at the encoder end;
[0074] (3) Enhancement layer code rate control: perform successively refined code rate control on the enhancement layer at the encoder end;
[0075] (4...
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The invention relates to encoding rate control method of fine particle flexible encoding based on the H.264 / AVC. The invention combines the basic flow and the reinforcement flow at the encoder into one code flow document, so only one code flow document and less information of reinforcement encoding should be transmitted; uses a encoding rate control method of FGS based on H.264 / AVC to self-adaptive select the QR (quantizing parameter) according to the result of optimizing the distortion; operates the encoding rate control of GOP (picture group) grade on the basic layer in the encoder; operates the encoding rate control on the reinforcement successively fined. Compared to other encoding rate control methods based on the multilayer video encoding, the invention has higher video quality and smooth change of PSNR (peak signal-to-noise ratio). In addition, the invention can use terminal which is arranged with different temporal resolution (frame speed) and different spatial resolution (image mode) to realize the real-time interception and decoding limited in a certain target bit rate at the receiving end. The result of testing said method indicates: the mean brightness peak signal-to-noise ratio (Y-PSNR) in the GIF mode is better than the one in JM8.6+FGS mode (using the basic layer encoding rate control of JM8.6 and using the bit plane truncation method of FGS as the reinforcement encoding rate control) to reach the 2.45 dB, while the former more matches the target bit rate.
Description
technical field [0001] The present invention relates to a video coding method, in particular to a code rate control method based on H.264 / AVC fine granular scalable coding. Background technique [0002] Rate control is the key technology of H.264 / AVC video codec. It is imperative for the encoder to allocate the appropriate number of bits for each video frame and to make the variable bitrate as smooth as possible. There are two different rate control schemes for H.264 / AVC: one is TM5 derived from MPEG-2, which is not suitable for low bit rate video applications; the other is based on traffic model, linear model and rate-distortion optimization (RDO ) control strategy. [0003] Although H.264 / AVC has high encoding efficiency, its various prediction modes and RDO options bring new problems to the rate control. Pornthep Navakitkanok and others proposed a rate control scheme that can effectively allocate the number of bits and monitor the fullness of the buffer, but only consi...
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IPC IPC(8): H04N7/24
Inventor 张兆扬李志刚王国中
Owner SHANGHAI UNIV