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An Image Compression Method Based on Transform Domain Downsampling Technology

An image compression, transform domain technology, applied in image coding, image data processing, code conversion and other directions, can solve problems such as low overall coding efficiency

Active Publication Date: 2017-10-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the traditional JPEG image compression method, the present invention has the characteristics of flexibility and high efficiency, and can overcome the disadvantage of low overall encoding efficiency caused by the single encoding mode in the traditional JPEG image compression method

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  • An Image Compression Method Based on Transform Domain Downsampling Technology
  • An Image Compression Method Based on Transform Domain Downsampling Technology
  • An Image Compression Method Based on Transform Domain Downsampling Technology

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Embodiment Construction

[0167] 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:

[0168] Step 1, image preprocessing

[0169] 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 , here, N represents the total number of image blocks after image division, i represents the index of the image block, i∈{1, 2,..., N};

[0170] Step 2, generation of index matrix

[0171] Arrange the 256 natural numbers 1, 2, ..., 256 column by column in order from small to large and from top to bottom to generate ...

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Abstract

The present invention provides an image compression method based on the transform domain down-sampling technology, which uses the method based on the transform domain down-sampling to encode the relatively smooth image area inside, and then uses the interpolation technology to reconstruct, which greatly reduces the encoding cost. Bit rate; using the traditional encoding method based on the JPEG image compression standard to encode image areas with complex internal textures; combining the two encoding methods, using different encoding strategies for different types of image areas, to realize the entire image signal efficient compression. Compared with the traditional JPEG image compression method, the present invention has the characteristics of flexibility and high efficiency, and can overcome the disadvantages of the traditional JPEG image compression method that the encoding mode is single, resulting in low overall encoding efficiency.

Description

technical field [0001] The invention belongs to the field of image compression, and mainly relates to the coding technology of digital images. Background technique [0002] As an information carrier for people to acquire and disseminate knowledge, images have become an indispensable part of people's daily life. With the rapid development of multimedia technology, image processing and transmission technology has become a common key technology in digital media industries such as digital video broadcasting, game animation, film and television production, content retrieval, media storage, media entertainment, and multimedia communication. Because the image data itself has the characteristics of large data volume, in order to save transmission bandwidth and storage space, people often use image compression technology to reduce the data volume of the image. The essence of reducing the amount of image data is to remove the redundancy between image pixels, that is, the correlation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00H03M7/30
Inventor 朱树元曾兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA