Feature extraction method and device

A feature extraction and feature point technology, applied in the field of image matching, can solve the problems of large differences in shooting angles and unsatisfactory image matching effects, etc., and achieve low pickiness, avoid adverse effects, and widely applicable effects
CN104268550BInactive Publication Date: 2017-08-25鲁路平
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
鲁路平
Publication Date
2017-08-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a feature extraction method and device, which solves the problem of unsatisfactory matching effect of images with large shooting angle differences in the prior art. The method includes: extracting the feature points of the original image; assigning each of the feature points two or more scale windows of different sizes; in each scale window, using the feature point as the center of the scale window as a seed point The region grows to obtain more than two foreground regions corresponding to each feature point, and the number of foreground regions corresponding to each feature point is equal to the number of scale windows assigned to each feature point; calculate each of the foreground A covariance matrix of the area; performing affine deformation correction on the original image according to the covariance matrix of the foreground area; extracting feature points from the corrected image, and performing feature point description. Using the method can significantly improve the image matching effect, and is easy to implement and easy to popularize and apply.
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Description

technical field

[0001] The present invention relates to image matching technology, in particular to an image feature extraction method and device. Background technique

[0002] It is a very important basic step in the field of computer vision to image the same scene from different shooting orientations, and perform automatic image matching on these images to find out the same-name point in the image (that is, the imaging position of the same object space point on different images). . The greater the difference in shooting orientation of the images, the more serious the deformation between the corresponding images, and the greater the difficulty of image matching.

[0003] The current image matching algorithm can match images with less deformation very well, but for images with large differences in shooting angles, such as images exceeding 40 degrees, the matching effect cannot be effectively guaranteed. Contents of the invention

[0004] The purpose of the present invent...

Claims

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