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Sub-pixel edge detection method

A technology of sub-pixel edge detection method, applied in the field of image processing, can solve the problems of inability to meet complex edge detection, and achieve the effect of enhanced positioning ability and improved accuracy

Inactive Publication Date: 2018-10-12
GUANGZHOU UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to propose a sub-pixel edge detection method for the problem that the computer vision industrial measurement in the above-mentioned prior art cannot satisfy complex edge detection, which can effectively improve the accuracy of complex edge detection

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[0026] In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] refer to figure 1 , the present embodiment provides a sub-pixel edge detection method, including:

[0028] Step S101, obtaining an original grayscale image, and obtaining pixel-level rough edges of the original grayscale image;

[0029] Step S102, indexing to the edge point of the pixel-level thick edge, and extending the edge along the gradient direction by interpolation;

[0030] Step S103, performing sub-pixel detection on the expanded edge points to obtain the sub-pixel position of the edge.

[0031] Further, in step S101, the Canny edge detection method is used to obtain the p...

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Abstract

The invention provides a sub-pixel edge detection method, comprising the steps of: acquiring an original gray image, and acquiring a pixel-level thick edge of the original gray image; indexing edge points of the pixel-level thick edge, and extending the edge by interpolation along a gradient direction; and performing sub-pixel detection on the extended edge points to obtain sub-pixel positions ofthe edge. The interval between edges in complex edges is extended by interpolating edge point neighborhoods based on the gradient direction, so that the precision of sub-pixel edge detection is greatly improved, and the sub-pixel level positioning capability on the complex edges is also significantly enhanced.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a sub-pixel edge detection method. Background technique [0002] With the development of computer vision industrial measurement technology, high-precision edge detection and edge location technology emerges as the times require. Efficient and accurate detection technology will greatly break through the hardware limitations of image acquisition equipment, which can not only improve the accuracy of edge detection, but also reduce equipment costs and energy consumption. [0003] In traditional computer vision industrial measurement, the accuracy of image edges is improved by increasing the sampling rate. However, the sampling rate cannot be increased infinitely. Too high a sampling rate not only cannot significantly improve the positioning accuracy, but also increases the production cost. With the development of digital image processing technology, a sub-pixel-based edge d...

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Application Information

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IPC IPC(8): G06T7/13
CPCG06T2207/30108G06T7/13
Inventor 彭绍湖苏伟强刘长红胡晓
Owner GUANGZHOU UNIVERSITY
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