High-efficiency image compression method based on spatial domain downsampling mode

An image compression and spatial domain technology, applied in the field of image processing, can solve the problem of single coding mode

Active Publication Date: 2015-09-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Compared with the traditional JPEG image compression method, the present invention provides two encoding modes, which can overcome the disadvantage of single encoding mode in the traditional JPEG image compression method

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  • High-efficiency image compression method based on spatial domain downsampling mode
  • High-efficiency image compression method based on spatial domain downsampling mode
  • High-efficiency image compression method based on spatial domain downsampling mode

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Embodiment Construction

[0097] 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:

[0098] Step 1, image preprocessing

[0099] Set image width W=16 m , the image height H=16 n , where m and n are all natural numbers, divided into N=(W×H) / 16 according to the image block method in the traditional JPEG image compression standard 2 A non-overlapping square image block with a size of 16×16, denoted as B 1 , B 2 ,...,B i ,...,B N , where N represents the total number of image blocks after image division, i represents the index of the image block, i∈{1, 2,..., N};

[0100] Step 2, downsampling of image blocks

[0101] First, define a downsampled image block with a size of 8×8 as B' i ; Here, i represents the index of the image block, i ∈ {1,...

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Abstract

The invention provides a high-efficiency image compression method based on a spatial domain downsampling mode. Through an image macro block, the interior of which is relatively smooth, the method based on the spatial domain downsampling is used for coding, and the interpolation technology is used for reconstruction, thereby greatly reducing the coding rate under the condition of guaranteeing the coding fidelity. Meanwhile, for an image macro block, the internal texture of which is relatively complex, a conventional coding method based on a JPEG image compression standard is employed for guaranteeing the high-efficiency coding of the image macro block. A conventional image compression method neglects the characteristic differences among different regions in an image, so the conventional image compression method cannot effectively remove correlation among pixel points, and causes the low overall coding efficiency. The method achieves the implementation of different coding strategies for the image macro block with different characteristics in a segmented manner, and achieves the high-efficiency coding of the whole image.

Description

technical field [0001] The invention belongs to the field of image processing, and in particular relates to the coding technology of digital images. Background technique [0002] With the advent of the big data information age, multimedia signals are becoming the main body of information storage and dissemination, playing an extremely important role in promoting the national economy, ensuring social security, and disseminating advanced culture. As a common carrier of multimedia signals, image data is widely used in people's daily life. Image information contains rich content, but it occupies a large storage space, especially in today's era of increasing demand for high-resolution images. Therefore, how to compress image signals to save storage space has become an urgent problem to be solved . At the same time, with the development of the Internet, higher requirements have been put forward for the compression of image data in the transmission of image information. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/176H04N19/132H04N19/103H04N19/147
Inventor 朱树元曾兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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