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Bill image compression method based on JPEG (joint photographic experts group) compression principle

An image compression and ticket-like technology, applied in the field of image processing, can solve problems such as low compression ratio

Active Publication Date: 2014-04-02
NANJING FENGLIJIAN IT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristic of lossless compression is that the image quality after compression is better, but the disadvantage is that the compression ratio is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] In the bill image compression technology based on JPEG compression, according to the characteristics of the scanned electronic bill image, we preprocess the bill image to increase redundancy, and then use the newly proposed quantization table to perform JPEG compression operation. There are two main steps in the method of ticket image compression:

[0018] 1. Image preprocessing. Specific steps are as follows:

[0019] 1) First perform color space conversion on the original bill image I, from the RGB channel to the YCbCr channel, respectively Y, Cb, Cr, the formula is as follows:

[0020] Y = 0.299 R + 0.587 G + 0.114 B

[0021] Cb = - 0.1687 R - 0.3313 G + 0.5 B + 128

[0022] Cr = 0.5 R - 0.4187 G - 0.0813 B + 128

[0023] 2) Divide the three matrices of Y, Cb, and Cr into blocks, each 8*8 block is one block, if it is less than 8*8, it is counted as one block.

[0024] 3) Calculate the variance of the pixel values ​​of each block of the three matrices Y, Cb, and...

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Abstract

The invention relates to a bill image compression method based on a JPEG (joint photographic experts group) compression principle. An existing method cannot increase the compression ratio on the basis of guaranteeing quality. The method includes a bill image preprocessing step and a bill image JPEG compression step, and detailedly includes: finding an image block equalization preprocessing method according to variance of image blocks by means of image rearrangement; and compressing images by a JPEG method by the aid of a quantization table which is optimized to be suitable for the bill images. By the aid of the bill image compression method, the compression ratio is higher with certain image quality guaranteed.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a bill image compression method based on the JPEG compression principle. Background technique [0002] With the rapid development of the economy, bill images are more and more widely used in finance, statistics and other fields. A large number of such digital images are generated every day. If such images are not compressed a lot, it will consume a huge amount of storage. device. Many compression algorithms have been proposed, such as wavelet compression, jpg compression, fractal compression and so on. [0003] However, these compression methods are all aimed at general images, and there is no special compression method to compress document images. This kind of image data is huge and important, requiring us to greatly increase the compression ratio on the basis of ensuring a certain quality. [0004] Image compression can be divided into lossy compression ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/41
Inventor 陆剑锋
Owner NANJING FENGLIJIAN IT CO LTD