Improved directional filter and flexible matching based recognition method
A technology of directional filtering and recognition methods, which is applied in the directions of character and pattern recognition, instruments, computer parts, etc., can solve the problems of great influence on the accuracy of recognition results, large amount of calculation, and great influence on image quality recognition results, etc., to achieve The effect of high reliability, high precision and high use value
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0037] A recognition method based on improved direction filtering and flexible matching. Firstly, for the read finger vein image, the direction characteristic of the vein pattern is used to design the neighborhood direction suitable for each pixel of the finger vein image to form a direction template, and the direction filter The design of the template expands the traditional 7×7 template into a 9×9 template to solve the problem of template overflow caused by rotating the template in the horizontal direction to obtain templates in other directions; on this basis, using the idea of flexible matching , within a certain range of angle and radius to achieve matching recognition between detail feature point sets. Such as figure 1 shown
[0038] From the topological structure of finger veins, it can be seen that the vein lines extend in a specific direction and have obvious directionality. However, the traditional filter does not take into account the direction information of the...
Embodiment example 2
[0040] According to the recognition method based on improved directional filtering and flexible matching described in Embodiment 1, the directional filtering template of the pixel point neighborhood of the finger vein image, the described directional filtering template sets the neighborhood of each pixel point to 8 For the discrete direction centered on the pixel point, the reference pixel point is located at the center of the direction filter template, and the values 1-8 on the direction filter template respectively correspond to 8 discrete directions, that is, starting from the horizontal position, press In the counterclockwise direction, a direction is determined every 22.5°. The direction angle range of the direction filtering template is [0, п) and the template is in the five adjacent directions of 1, 2, 3, 7, and 8 tending to the horizontal direction. There are more pixels in the domain, and fewer pixels in the neighborhood taken in the vertical directions of 4, 5, and ...
Embodiment example 3
[0050] According to the identification method based on improved directional filtering and flexible matching described in embodiment 1 or 2, the expanded directional filtering template aims at the template overflow problem generated when the template in other directions is obtained by rotating the template in the horizontal direction, the present invention Expand the traditional 7×7 template into a template with a size of 9×9. The coefficients of the outermost circle of the expanded template are all 0. When using this template to obtain templates in other directions, only the 7×7 in the center of the template is used. Coordinate rotation is carried out for the coefficients within the range, and the positions without coefficients in the rotated template are represented by 0, which avoids the situation of discarding coefficients when the template rotation overflows, and will not destroy the distribution of coefficients.
PUM

Abstract
Description
Claims
Application Information

- Generate Ideas
- Intellectual Property
- Life Sciences
- Materials
- Tech Scout
- Unparalleled Data Quality
- Higher Quality Content
- 60% Fewer Hallucinations
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com