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Method of oblique wavelet image fingerprint extraction and authentication

A technology of image fingerprint and extraction method, which is applied in character and pattern recognition, instruments, computer components, etc., and can solve problems such as poor robustness of geometric transformation

Inactive Publication Date: 2006-02-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for extracting oblique wavelet image fingerprints, so as to overcome the defects of poor robustness of visual invariance transformation and geometric transformation in existing image fingerprint extraction methods

Method used

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  • Method of oblique wavelet image fingerprint extraction and authentication
  • Method of oblique wavelet image fingerprint extraction and authentication
  • Method of oblique wavelet image fingerprint extraction and authentication

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specific Embodiment approach 1

[0008] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. This embodiment is realized by the following steps: 1. Convert the image of the fingerprint to be extracted into a grayscale image with equal length and width; 2. Divide the grayscale image into several squares of the same size from left to right and from top to bottom image block, the total number of image blocks is m×m, and m must be a power of 2; 3. Find the filter used for oblique wavelet transform, and the coefficients of this filter are selected eight, which are g(0 ), g(1), g(2), g(3), g(4), g(5), g(6) and g(7), the coefficients of the filter are calculated according to the following formula: s 1 = 6 * m / ( ( m 2 - ...

specific Embodiment approach 2

[0009] Specific implementation mode two: the following combination figure 2 This embodiment will be specifically described. This embodiment is realized by the following steps: A. extract the image fingerprint of the original image and the image fingerprint of the image to be verified respectively; A result sequence with the same length; C. Dividing the number of "1" values ​​in the result sequence by the length of the result sequence yields the difference β between the two image fingerprints; D. Judging whether β is less than the preset threshold θ; E. If the result is no, it is determined that the contents of the two images are different; F, if the result is yes, it is determined that the contents of the two images are the same. The following is an image fingerprint demonstration example of oblique wavelet transform, Figure 4 is an original image, Figure 5 yes Figure 4 After JPEG lossy compression, it is obvious that the two images are basically the same visually. Af...

specific Embodiment approach 3

[0010] Specific implementation mode three: the following combination image 3 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 is that in Step 5, the filtered grayscale result values ​​of the image blocks are read and arranged in a sequence in the following order: starting from the upper left corner of the result value matrix to circle in a zigzag Zigzag to the bottom right to read the grayscale result value. Since the low-frequency part of the grayscale image signal is concentrated on the left and upper part of the result value matrix, and the frequency gradually increases toward the lower right, according to this embodiment, the read digital frequency changes gently, and the compression performance is better. image 3 The digital serial number in is the scanning sequence, which corresponds to the frequency range. In this embodiment, it is best to select 0 to 33 as the low frequency part of the image signal to be read as...

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Abstract

The invention discloses an image fingerprint extracting method and checking method. The extracting method comprises the following steps: transforming the image into a plurality of grey square image blocks; using the wave filter to filter each image block according to the line and row by the convolution formula, it reads and arranges the grey result value of each image block of the result value array left part area; the positive value of the sequence is corresponding to 1, the negative value is corresponding to, 0, then it forms an image fingerprint of the total picture. The image fingerprint checking method dose, or exclusive or operation to the corresponding location of the two image fingerprints and ascertains weather the relative amount is identification by the, 1 value.

Description

Technical field: [0001] The invention relates to a method for extracting image fingerprints, and also relates to a verification method for image fingerprints. Background technique: [0002] In recent years, with the rapid development of network technology and multimedia technology, people can easily use digital equipment to produce, process and store images and use the Internet to transmit images. However, digital image information is very easy to be copied, tampered with and disseminated privately, which leads to security issues of digital images. In addition, when digital images are browsed and purchased by customers as commodities, users need a way to quickly find the commodities they are interested in, and image distributors also need to effectively manage these commercial digital images so that they can meet the needs of the images. Browse, search and classify, and effectively monitor and protect your products from being pirated and tampered with. People think that if...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46G06K9/00
Inventor 孙圣和俞龙江
Owner HARBIN INST OF TECH
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