Consistency-based edge detection method

An edge detection and consistency technology, applied in the field of image processing, can solve the problems of reducing the amount of calculation, to achieve the effect of reducing the amount of calculation, improving the effect of edge extraction, and ensuring the positioning accuracy

Inactive Publication Date: 2015-01-07
BEIHANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the above problems, and propose a method of edge detection based on consistency, which better solves the coordination problem o

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[0026] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0027] In view of the existing edge detection algorithms, it is difficult for traditional algorithms to take into account the shortcomings of noise suppression and complete and accurate edge positioning at the same time, while emerging algorithms are prone to false edges and long operation time. The present invention uses the characteristics of the gray gradation on both sides of the real edge to propose an index that describes the consistency of the gradient direction, and evaluates the possibility of the edge based on the consistency of the direction of the gray change of adjacent pixels at the edge, and based on the consistency index Adaptively adjust the gray gradient threshold, effectively distinguish the real edge and noise interference under high gray gradient, and at the same time realize the effective detection of weak gray gradient edges with good grad...

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Abstract

The invention discloses a consistency-based edge detection method. The consistency-based edge detection method comprises the steps of (1) utilizing the image gray scale gradient magnitude for screening out an initial edge set, (2) calculating an image gray scale gradient direction sum, (3) extracting the edge set according to the gradient direction sum, and (4) conducting edge refining. According to the consistency-based edge detection method, the index of the gray scale gradient direction sum is introduced, the correlation of the gray scale gradient directions near edges is utilized for analyzing the edge occurrence rationality, the new imaging noise determination method is provided, gray scale gradient changes caused by actual edges and noise can be effectively distinguished, and the edge extracting effect can be improved by combining the index with other methods.

Description

technical field [0001] The invention belongs to the technical field of image processing, relates to a consistency-based edge detection method, and belongs to an image edge detection method. Background technique [0002] The edge refers to the boundary line between the target and the background and the boundary line between the target and the target in the image. The edge detection of the image retains the important structural characteristics of the image and eliminates irrelevant information, which is of great significance for the recognition or description of the target. Edge detection is the most basic tool in image processing applications such as pattern recognition, robot vision, image segmentation, feature extraction, and image compression. [0003] The edge of the image is usually the singular point and abrupt point of the gray function of the image. If the gray level change is used as the basis of edge detection, the edge can be extracted according to the image grad...

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/13
Inventor 张海杨飞菲
Owner BEIHANG UNIV
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