Video rate control method with low complexity

A code rate control and low-complexity technology, applied in the field of code rate control mechanism, can solve the problems of high complexity, insufficient control precision, and inability to control the code rate, etc., so as to avoid delay, simple and effective calculation, and good rate-distortion Effect

Inactive Publication Date: 2007-07-04
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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Problems solved by technology

The advantage of the first type of method is that bit rate adjustment can be optimized by analytical methods, but due to the randomness of the video content itself, a single analytical model cannot accurately describe the characteristics of the video itself, so more control is required parameters to get a more satisfactory effect, the complexity is very high
The second type of method is simple to operate, but the control precision is not enough
Although such a model effectively combines the analytical model and the buffer control model, it can meet the

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  • Video rate control method with low complexity
  • Video rate control method with low complexity
  • Video rate control method with low complexity

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] The code rate allocation process mainly involves differential histogram calculation, frame-level code rate allocation and coding unit-level code rate allocation. As shown in Figure 1, the three parts in the figure refer to histogram calculation, frame allocation and unit allocation respectively.

[0026] Quantization parameter estimation is shown in Fig. 2. In the code rate control method, in order to improve the control precision, it is necessary to reduce the control granularity, so each frame is divided into several basic coding units, and the code rate control process is performed on the basis of the basic units. For each basic unit, the coding complexity is predicted through its difference histogram, and then the quantization parameter that the coding unit should adopt can be obtained according to the pre-allocated code rate.

[0027] The overall process ...

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Abstract

The invention relates to a simple video code rate control method, which comprises bit rate preset process and quantified parameter adjustment, wherein the bit rate preset process uses video sequence character to preset the code rate; the quantified parameter adjustment uses the video sequence character to predict the code complexity, to evaluate the quantified parameters; the video sequence character is the differential diagram representing the local motion of video sequence. The invention has the advantages that: it can adjust the code rate distribution via the change to video content; the quantified parameters have simple calculation, with adaptive content; the code distribution and adjustment can match the change of video content; and it uses accumulation refresh statistic method to avoid time delay.

Description

technical field [0001] The present invention relates to a code rate control mechanism, more specifically, the present invention relates to a low-complexity video code rate control method based on original video statistical characteristics. Background technique [0002] Rate control technology is a hot issue in the field of video coding and communication, and plays a very important role in video communication. The code rate control technology can generally be divided into three types: one is to use the analytical model of the code rate-quantization parameter; The advantage of the first type of method is that bit rate adjustment can be optimized by analytical methods, but due to the randomness of the video content itself, a single analytical model cannot accurately describe the characteristics of the video itself, so more control is required The parameters can get a satisfactory effect, and the complexity is very high. The second type of method is simple to operate, but the ...

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Application Information

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IPC IPC(8): H04N7/32H04N7/50H04N7/26H04N19/124H04N19/50
Inventor 周树民李锦涛张勇东
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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