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Improved EZW-based RMB banknote crown word number image compression method

An image compression and RMB technology, applied in image coding, image data processing, instruments, etc., can solve the problems of slow codec speed, large storage space, complex calculation, etc. efficiency effect

Active Publication Date: 2021-10-26
UNIV OF SCI & TECH LIAONING
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Problems solved by technology

[0004] In order to solve the problems described in the background technology, the present invention provides a method for compressing images of RMB banknote serial numbers based on improved EZW, which is an improved algorithm for image compression of RMB banknote serial numbers, which can overcome complex calculations, large amount of computation, and The problem of slow encoding and decoding speed and large storage space is used to efficiently improve the image compression effect

Method used

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  • Improved EZW-based RMB banknote crown word number image compression method
  • Improved EZW-based RMB banknote crown word number image compression method
  • Improved EZW-based RMB banknote crown word number image compression method

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[0103] Step S0101: First, perform a splitting process, splitting the original signal into mutually disjoint subsets; judge the correlation between the data through prediction, and reflect the similarity between the data value and the predicted value; update the data according to the different attributes; Finally, combined with the actual situation, the dual lifting step and update lifting step are used alternately to improve the performance of wavelet transform, so as to obtain the low-frequency and high-frequency parts in the horizontal direction after N-level wavelet transform, and finally obtain the tree structure diagram.

[0104] Lifting wavelet transform process, through the process of splitting, predicting, updating and optimizing the lifting step. Split the original signal S a，b into two disjoint subsets S a+1，b and y a+1，b , its mathematical expression is shown in (1):

[0105] split(S a，b )=(S a，2b , S a，2b+1 )=(S a+1，b ,y a+1，b ) (1)

[0106] Some global pr...

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Abstract

The invention provides an improved EZW-based RMB banknote crown word number image compression method, and the method comprises the steps: collecting an RMB paper currency prefix word number image, carrying out the lifting wavelet transformation of the RMB paper currency prefix word number image, and building a wavelet coefficient tree structure; adjusting a low-frequency sub-band of the image after wavelet transformation and then directly storing the low-frequency sub-band; if the data is the data of the high-frequency sub-band, enabling the high-frequency part to be subjected to improved embedded zero-tree coding; finally outputting coding information. and combining low-frequency and high-frequency data to realize compression of RMB paper currency prefix word number images. The reconstruction process of the RMB paper currency prefix word number image, namely the decoding process is the inverse process of encoding, wavelet transform is adopted to process the RMB paper currency prefix word number image, the problems of complex calculation, large calculation amount, low encoding and decoding speed and large storage space can be solved, and the image compression effect is efficiently improved; the compression speed and the PSNR value of the RMB paper currency crown word number image are both superior to those of a traditional EZW algorithm.

Description

technical field [0001] The invention relates to the technical field of image data compression methods, in particular to an improved EZW-based image compression method for RMB banknote serial numbers. Background technique [0002] No matter in any country, banknotes are the most extensive means of circulation, so it is particularly important to strengthen the management of banknotes. The serial number is the identification of the identity of the banknote, it is unique, and it is a sign to prove the uniqueness of the banknote. If there are repeated serial numbers or damaged banknotes during the manufacturing process, it will have serious consequences for the financial security of the country. With the advent of the 5G era, image compression facilitates efficient storage, management and transmission of information. However, it is difficult to meet the application requirements of rapid data growth only by improving the performance of computer hardware and communication equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/40
CPCG06T9/40
Inventor 张婉莹吴庆洪宋强王琳
Owner UNIV OF SCI & TECH LIAONING
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