Unlock instant, AI-driven research and patent intelligence for your innovation.

A control method and device for image code rate

A control method and image code technology, applied in image communication, television, electrical components, etc., can solve the problems of large macroblock quantization, fluctuation of output code stream, poor image quality, etc., and achieve high-quality results

Inactive Publication Date: 2008-02-20
HUAWEI TECH CO LTD
View PDF0 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the average output bit rate, the quantization of some macroblocks is relatively large, resulting in poor image quality
And the output code stream fluctuates in a small time range, which cannot fully meet the occasions with relatively high code rate requirements

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A control method and device for image code rate
  • A control method and device for image code rate
  • A control method and device for image code rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Referring to FIG. 2 , it is a schematic diagram of performing code rate control on macroblock code rate conversion when the code rate control method provided by the embodiment of the present invention is applied to the code rate conversion technology. The image data with the input code rate of Rate1 is decompressed by the VLD module, and then the uncompressed DCT domain image data is output. The data is dequantized by the IQ module, re-quantized by the Q module, and finally compressed and output by the VLC module to realize the original image. Code rate conversion from Rate1 to Rate2. Wherein, the quantization parameters required for the re-quantization of the Q module are determined according to the image code rate control method provided by the embodiment of the present invention shown in FIG. 3:

[0054] S301. Send the information needed to determine the target number of bits of the current macroblock to the code rate control module.

[0055] The input code rate det...

Embodiment 2

[0115] Referring to FIG. 6 , it is a schematic diagram of performing rate control on rate conversion of macroblocks when the rate control method provided by the embodiment of the present invention is applied to an image encoding technology.

[0116] When applying the method provided by the embodiment of the present invention to control the image bit rate in the image coding technology, the image analysis module analyzes the input original image, and analyzes the complexity of each macroblock of the original image of the current frame, the current The total number of bits of the frame original image, the original input code rate Rate1 of the current frame original image, and the macroblock total quantity information of the current frame original image are sent to the code rate control module; the output code rate determination module will require the output code rate Rate2 to be sent to Code rate control module;

[0117] The code rate control module determines the information s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The utility model discloses a control method and device for the image code rate in order to realize that a proper quantification parameter is chosen for each image block, which not only can reduces the difference between the actual code rate and the demanded code rate of each image after the code rate conversion, but also decreases the accumulative error. The method comprises that the target bits of the current image block is determined first, and the target bits refer to the target bits when the current image block output the code rate according to the requirements; then a quantification parameter is chosen which makes the actual bits of the current image block most close to the target bits among all the quantification parameters of the accumulative bits errors in all the converted image blocks; at last the current image is quantified according to the determined quantification parameter.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to digital image code rate control technology. Background technique [0002] In the prior art, for compressed image signals, such as mpeg2, mepg4, and H.264 image signals, corresponding image transformation techniques are often used to transform them according to different application scenarios and transmission channel requirements. For example, in order to meet the transmission bandwidth requirements of the channel, the code rate conversion method is used to adjust the code rate of the image; in order to meet the requirements of the terminal and channel bandwidth, the image format conversion method and frame rate conversion method are used to adjust the size and frame rate of the image. All these image conversion processes require rate control on the output bit rate, so as to finally meet the requirements of adapting to the channel and reducing the bandwidth. More...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/64H04N19/89
CPCH04N7/26244H04N7/26154H04N7/26079H04N19/124H04N19/147H04N19/176
Inventor 陈方耀
Owner HUAWEI TECH CO LTD