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EZW data compression method based on random threshold adjustment

A technology of data compression and threshold adjustment, which is applied in the fields of digital video signal modification, electrical components, image communication, etc., can solve the problems of degraded compression quality, degraded signal-to-noise ratio, etc., and achieve higher compression ratio, higher compression ratio, and better restoration effect. Effect

Active Publication Date: 2019-06-28
GUIZHOU UNIV
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Problems solved by technology

However, the compression quality will decrease and the signal-to-noise ratio will decrease

Method used

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  • EZW data compression method based on random threshold adjustment
  • EZW data compression method based on random threshold adjustment
  • EZW data compression method based on random threshold adjustment

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Embodiment Construction

[0042] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0043] Embedded zerotree wavelet principle: multi-resolution analysis and wavelet transform, let x∈R,f:x→R and ψ k (x): x→R is a linearly independent function system, then f(x) can be expressed as:

[0044]

[0045] Among them, a k is the expansion coefficient, and V is called the function system {ψ k The spanning space of (x)}:

[0046]

[0047] For example, with integer translations and real binary scales, the square integrable function ψ k Form the set of expansion functions {ψ j,k (x)}:

[0048] The wavelet forward and inverse transform formulas of one-dimensional functions are as follows:

[0049]

[0050]

[0051] where C ψ Satisfying the admissible conditions, formula (3) is the process of finding the expansion coefficient, and formula (4) is a function in the spanning function space. Let the function system {ψ j,k ...

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Abstract

The invention discloses an EZW data compression method based on random threshold adjustment. The method comprises the following steps of: carrying out wavelet coding on an image to obtain wavelet transform; quantification, coding, decoding process is opposite thereto, when image scanning coding is carried out, an initial threshold value is calculated firstly, then EZW coding is carried out, the EZW coding adopts a method of randomly adjusting the threshold value for judging the importance of a wavelet coefficient to code a digital image, and the specific method is that when the threshold valueis divided by 2 every time, a positive random number in an adjustable range is added to a divisor 2. According to the method, the threshold value for judging the importance of the wavelet coefficientis randomly adjusted. According to the technical scheme, the threshold value is randomly selected in a small range, the compression ratio is increased while the restoration quality is ensured, the threshold value is randomly selected in different ranges for encoding the same image, the compression ratio is increased, the restoration effect of the distorted compressed image is good, and although the peak signal-to-noise ratio is reduced to a certain extent, the influence is not large.

Description

technical field [0001] The invention relates to an EZW data compression method based on random threshold adjustment, and belongs to the technical field of distributed power supply parallel operation control. Background technique [0002] The information displayed by the image is obvious, intuitive, and clear, and can well represent the information that people see. However, the image contains a large amount of information, which makes the image information occupy a large storage space and increases the cost of information acquisition. Nowadays, in the era of rapid development of the network, a large amount of information redundancy can no longer meet people's requirements for the speed of information acquisition. . In such an era environment, image compression has become an important direction for people to solve problems. Such as remote sensing images, medical images, meteorological cloud images, digital television and other fields have a wide range of applications. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/48H04N19/64
Inventor 谢玫秀马家庆
Owner GUIZHOU UNIV
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