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Video-frequency compressed code ratio control method

A video compression and code rate technology, applied in the direction of pulse modulation TV signal transmission, etc., can solve problems such as difficult implementation and complex calculation

Inactive Publication Date: 2007-01-10
北京威速科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the calculation is too complicated and difficult to implement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0012] The method of the present invention is described below:

[0013] (1) The present invention utilizes the first-order rate-distortion model R=X1*S*Q**(-1), wherein R represents the amount of data (number of bits) that has been encoded, x1 is the first-order coefficient of the model, and S is the current true The complexity of is represented by the mean absolute value difference MAD, and Q is the quantization factor that will be needed soon.

[0014] 1. Initialize the model coefficient X1;

[0015] 2. Calculate the target bit rate of the current frame:

[0016] 3. Calculate the quantization factor;

[0017] 4. Update model parameters.

[0018] The above 4 steps are described in the MPEG4 standard document, except for using the first-order rate-distortion model, the target code rate in step 2 can be changed, and the changing met...

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PUM

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Abstract

Based on the code rate controlled by the first order distortion model, the feedback mechanism is added in the invention in order to change the target code rate, making the code rate control more accurate and the calcualting speed of the first order model quicker. Using statistical frame loss history averages the interval of the frame loss. Meanwhile, when frame loss happens, the user is allowed choosing the trade-off decision between the image quality and the frame rate by referencing the magnitude of the quantization factor. The invention possesses the advantages of fast speed, high accuracy as well as smooth change of the image quality compressed.

Description

technical field [0001] The invention relates to a method for quickly and accurately controlling code rate in video compression. Background technique [0002] Since video encoding is related to content, the data volume of compressed frames will change, so the data volume (code rate) per unit time will fluctuate. In practical applications, especially in video streaming, a constant bit rate is required. The principle of code rate control is to use a mathematical model to recalculate the quantization factor of the next frame through the currently known user-specified code rate and the number of compressed bits, thereby changing the number of encoded bits to achieve the purpose of controlling the code rate . [0003] At present, the better method of rate control is the scalable rate control strategy (SRC) proposed in MPEG4. The main content of this method is to use the second-order rate-distortion model and refine the rate control to each block or macro. on the block. The dis...

Claims

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Application Information

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IPC IPC(8): H04N7/24
Inventor 谷云洪
Owner 北京威速科技有限公司