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Code rate control method and control apparatus

A rate control and coding technology, applied in the field of video processing, can solve the problem of not being able to replace the quantization coefficient, and achieve the effects of avoiding excessive local deviation, reducing flicker noise, and adjusting accurately and quickly

Inactive Publication Date: 2009-01-07
VIMICRO CORP
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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a code rate control method and control device, which can reduce the flicker noise of the picture, and solve the technical problem that other quantization coefficients cannot be temporarily replaced in the middle of the encoding process of an image in the prior art

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  • Code rate control method and control apparatus

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Embodiment Construction

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, specific embodiments will be described in detail below with reference to the accompanying drawings.

[0038] figure 2 The flow chart of the steps of the method provided by the embodiment of the present invention, as shown in the figure, the code rate control method of the embodiment of the present invention includes:

[0039] Step 101, for each frame of image, divide it into N regions according to the sequence of coding, and record the coded stream length of each region;

[0040] Step 102: Adjust the number of non-zero DCT coefficients allowed in the coding process of the uncoded region according to the comparison result between the code stream length of the coded region and the predetermined threshold.

[0041] The embodiment of the present invention is to dynamically adjust the maximum number of DCT coefficients in each region by tracking the code...

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Abstract

The invention provides a bit rate control method and a bit rate control device. The method of the invention comprises the steps as follows: step 1: each frame of image is divided into N areas according to the sequence of coding and the bit flow length of each area after coding is recorded; step 2: according to the comparison result between the bit flow length of the coded area and a prearranged gate limit, the number of non-zero DCT coefficients of non-coded areas allowed in the coding process is adjusted. The bit rate control method and the control device of the invention can adjust the whole frame of image by area, divides the complex part from the simple part, avoids excessively large local offset, stabilizes the number of DCT coefficients in corresponding area of each frame of image on the time sequence, and reduces the flash noise of the picture plane.

Description

technical field [0001] The present invention relates to video processing technology, in particular to a code rate control method and control device in the encoding process. Background technique [0002] In the field of video processing, in many cases, the camera needs to perform JPEG (Joint PhotograhicExperts Group, Joint Photographic Experts Group) compression, and then transmit the image compression coded by the photosensitive device to save transmission bandwidth (such as USB transmission, or ADSL transmission, etc.). In this way, the speed of the JPEG code stream needs to be controlled. Traditional JPEG code stream control is often based on the premise that there is at least 1 frame of JPEG code stream size output buffer capacity in the system (for example, for an image of VGA (display graphics array) size, the output buffer is 30-40K bytes) Next, by controlling the quantization coefficient of JPEG, it is indirectly controlled how many coefficients in the DCT (discrete...

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Application Information

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IPC IPC(8): H04N7/24H04N19/146H04N19/625
Inventor 王浩李昕彤
Owner VIMICRO CORP
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