Low-resolution image coding method based on intelligent quantification technology
A low-resolution image and encoding method technology, applied in the field of digital image compression, can solve problems such as uncontrollable pixel encoding quality
Active Publication Date: 2016-05-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Compared with the traditional implementation method of "coding compression + low-resolution display" based on the JPEG image coding standard, the present invention can flexibly allocate coding resources according to the specific requirements of low-resolution display output, thereby improving the coding of output pixels. Quality, to overcome the shortcomings of traditional methods that cannot control the quality of pixel coding
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[0044] The present invention mainly adopts the mode of simulation experiment to verify the feasibility of the system model, and all steps have been verified by experiment. In order to realize the image compression based on the transform domain down-sampling technology, the specific implementation steps are as follows:
[0045] Step 1, image preprocessing
[0046] Set image width W=8 m , the image height H=8 n , where m and n are all natural numbers, divided into N=(W×H) / 8 according to the method of image segmentation in the traditional JPEG image compression standard 2 A non-overlapping square image block with a size of 8×8, denoted as B 1 , B 2 ,...,B i ,...,B N , here, W represents the width of the image, H represents the height of the image, N represents the total number of image blocks after the image is divided, i represents the index of the image block, i∈{1,2,...,N};
[0047] Step 2, image block coding parameter setting based on intelligent quantization technology...
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The invention provides a low-resolution image coding method based on an intelligent quantification technology. Reasonable coding resource distribution is carried out through the intelligent quantification technology; pixel points in an image are subjected to different coding reconstruction by utilizing the intelligent quantification technology; the pixel points in need of being displayed and output are subjected to high-quality compressed coding; the pixel points with no need for being displayed and output are subjected to low-quality compressed coding; and high-efficiency image low-resolution reconstruction requirements after coding are adaptive. Compared with the traditional implementation method of coding compression and low-resolution display based on the JPEG image coding standard, the low-resolution image coding method disclosed by the invention can flexibly distribute coding resources according to specific low-resolution display and output requirements; therefore, the coding quality of the output pixel points is improved; and the disadvantage that the coding quality of the pixel points is difficultly controlled in the traditional method can be overcome.
Description
technical field [0001] The invention belongs to the field of image coding, and mainly relates to digital image compression technology. Background technique [0002] With the development of multimedia technology, the encoding and compression of images is required not only to meet the changing transmission conditions, but also to adapt to different display environments, especially for the captured image signals, it needs to be able to adapt to mobile devices including smartphones and tablet computers. Demand for various playback terminals equipped with only low-resolution display screens. Therefore, how to take into account the high-efficiency low-resolution display requirements in the process of encoding and compressing image signals is a major challenge in the field of image encoding. [0003] The low-resolution display of images usually involves down-sampling the image signal in the spatial domain, reducing the displayed pixels to meet the requirements of low-resolution re...
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Login to View More IPC IPC(8): H04N19/146H04N19/124H04N19/166
CPCH04N19/124H04N19/146H04N19/166
Inventor 朱树元曾辽原
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA