Method for identifying left and right palm prints based on directions

A technology of palmprint recognition and direction histogram, which is applied in character and pattern recognition, image analysis, instruments, etc., can solve the problem of slow recognition speed and achieve the effect of simple method and high accuracy

Inactive Publication Date: 2013-12-04
PEKING UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For high-resolution palmprints, they have many similarities with fingerprint images, so the technology similar to fingerprint image processing and matching is generally used to identify high-resolution palmprints, but because palmprints are much larger than fingerprints area and more feature points, so the recognition speed will be greatly reduced

Method used

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  • Method for identifying left and right palm prints based on directions
  • Method for identifying left and right palm prints based on directions
  • Method for identifying left and right palm prints based on directions

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Embodiment Construction

[0065] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0066] figure 1 It is a palmprint image, and the direction pointed by the arrow is the direction of the outer area of ​​the palmprint. It can be seen that the direction of the palmprint is basically the same.

[0067] Embodiments of the present invention include the following steps:

[0068] 1. First, carry out the palmprint image ( figure 2 a) Segmentation:

[0069] 1) Variance calculation: Divide the palmprint image into w×w non-overlapping small blocks, and w can be valued according to the width of the lines in the palmprint image.

[0070] Calculate the grayscale variance of each block, then the grayscale variance represents a block, and all these grayscale variances constitute the variance image:

[0071] v ( x , y ) = ...

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Abstract

The invention discloses a method for identifying left and right palm prints based on directions. The method comprises the following steps of: (1) dividing a palm print image into a foreground area block and a background area block of the palm print; (2) performing two-dimensional Fourier transformation on the foreground area block of the image, thereby obtaining a direction theta (x, y) of the foreground area image; (3) calculating a direction histogram g(i) of the foreground area according to the direction theta (x, y) of the foreground area image, and performing one-dimensional mean value smoothing on the direction histogram g(i), thereby obtaining a smoothed histogram; (4) calculating the peak values of all peaks in the smoothed histogram and selecting the direction of the highest peak as the direction of a palm print outside area; and (5) judging left and right palms according to the direction of the palm print outside area, judging as the left palm when the direction is more than 90 degrees and judging as the right palm when the direction is less than 90 degrees. According to the method, the left and right palms are judged by utilizing the palm print direction, the accuracy is very high and can reach 98.92%, the number of the palm print identification is efficiently reduced, the efficiency of the whole identifying process is greatly increased, and the identifying accuracy is also increased.

Description

technical field [0001] The invention relates to palmprint recognition technology, in particular to a direction-based left and right palmprint recognition method. The invention belongs to the technical field of digital image processing and biometric identification. Background technique [0002] As an important biometric technology, palmprint recognition has gradually attracted people's interest recently. In terms of the depth and breadth of research, compared with fingerprint recognition which has a long research history, the research of palmprint recognition can only be said to be in the initial stage. However, due to the excellent characteristics of palmprint itself, palmprint recognition technology has great potential, and people's research on palmprint recognition technology has become more and more in-depth. [0003] For high-resolution palmprints, they have many similarities with fingerprint images, so the technology similar to fingerprint image processing and matchin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/46G06T7/00
Inventor 高欣封举富
Owner PEKING UNIV
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