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A low-bit-rate image compression method based on intelligent quantization technology

An image compression, low bit rate technology, applied in the field of image coding, can solve problems such as single coding mode

Active Publication Date: 2018-07-27
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 provides two coding modes under the condition of low bit rate, which can overcome the single coding mode disadvantage in the traditional JPEG image compression method

Method used

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  • A low-bit-rate image compression method based on intelligent quantization technology
  • A low-bit-rate image compression method based on intelligent quantization technology
  • A low-bit-rate image compression method based on intelligent quantization technology

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Embodiment Construction

[0058] 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:

[0059] Step 1, image preprocessing

[0060] 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};

[0061] Step 2, generation of index matrix

[0062] Arrange 64 natural numbers 1, 2, ..., 64 col...

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Abstract

The invention provides a low-bit-rate image compression method based on intelligent quantization technology. Under the premise of low-bit-rate compression, for relatively smooth internal image blocks, the method based on intelligent quantization technology is used to encode, and then combined with interpolation On the premise of controlling the encoding distortion, the encoding rate can be effectively reduced; at the same time, for image blocks with complex internal textures, the traditional encoding method based on the JPEG image compression standard is used to ensure efficient encoding of these image blocks. Different coding strategies are adaptively selected for image blocks with different texture features to achieve high-efficiency coding of the entire image. Compared with the traditional JPEG image compression method, the present invention can overcome the disadvantage of single coding mode in the traditional JPEG image compression method.

Description

technical field [0001] The invention belongs to the field of image coding, and mainly relates to digital image compression technology. Background technique [0002] Low bit rate image compression is often used in video surveillance, video telephony, satellite remote sensing image transmission and other scenarios. With the wide application of wireless communication networks, people have higher and higher requirements for real-time image transmission under limited bandwidth, and efficient low-bit-rate image compression technology can meet the needs of real-time image transmission under low bandwidth conditions. [0003] Image compression methods can be divided into two categories: lossless compression and lossy compression. Commonly used compression algorithms implement lossy compression of image signals through several core technologies such as transformation, quantization, and entropy coding. In order to achieve efficient low-bit-rate image compression, the traditional meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/103H04N19/147H04N19/176H04N19/124
Inventor 朱树元曾兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA