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Self-adapting code rate control method

A rate control and adaptive technology, applied in the field of rate control of video coding, can solve the problems of high hardware implementation cost and complex algorithm implementation, and achieve the effect of avoiding quality jumps, simple calculation, and preventing quality jumps.

Inactive Publication Date: 2008-08-27
ZHEJIANG HUATU MICROCHIP TECH CO LTD
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Problems solved by technology

But the algorithm is very complicated to implement, especially in hardware implementation.

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] The code rate control flow chart in the fixed code rate mode described in Figure 1, and Figure 2 is the flow chart of variable code rate control, the two flow charts have many similar calculation methods:

[0022] 1. A kind of code rate control method of the present invention is provided with two kinds of operating modes, in the video compression storage application that code rate is not high required, selects variable code rate, compresses complicated image with many bit numbers, few Simple images are compressed by the number of bits to make full use of storage space on the premise of ensuring image quality; in real-time applications such as video surveillance, a fixed bit rate is used to reduce the pressure on network transmission bandwidth.

[0023] 2. If the current encoded frame is an I frame and the previous frame is a non-I frame, as in step 1 of Figure 1...

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Abstract

The invention relates to a self-adaptive code rate controlling method with low complexity. The controlling method comprises two types of operating modes, namely, variable code rate and fixed code rate; wherein the variable code rate is usually used on non-real time application occasions requiring constant image quality, and the fixed code rate is usually used on real time application occasions requiring constant bandwidth; the method can self-adaptively adjust the quantization step size according to different application occasions and the characteristics of video sources, to achieve reasonable distribution of code rates; simultaneously, variation range limitation on the quantization step size is added, thereby quality jump among continuous images is effectively prevented, smooth transition is realized, and the realization of hardware is convenient.

Description

technical field [0001] The present invention relates to a code rate control method of video coding, more precisely, relates to a code rate control method for adaptively adjusting quantization parameters of an encoder according to image complexity or channel capacity according to different application modes. Background technique [0002] For video communication, due to the limited communication channel bandwidth, it is necessary to control the bit rate of video encoding to ensure the smooth transmission of the encoded bit stream and the full utilization of the channel bandwidth. At present, there are mainly two proposals for the H.264 bit rate control method: the improved version of MPEG-2TM5 in JVT-F086, and the traffic round-trip model proposed in JVT-G012 to allocate the target number of bits for each basic unit, and in the macroblock Layer encoding uses a quadratic rate-distortion function to calculate the quantization parameter algorithm. But the algorithm is very compl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/28H04N7/50H04N19/61
Inventor 叶志成江巧微秦兴
Owner ZHEJIANG HUATU MICROCHIP TECH CO LTD
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