Anti-jamming sub pixel straight line fitting method

Abstract

The invention discloses an anti-jamming sub pixel straight line fitting method. The method comprises the following steps that: carrying out ROI (Region of Interest) setting on an image, and detectingthe edge points of a straight line in the ROI; then, using a neighborhood weighting way to carry out subpixel refinement on the edge points, and calculating the subpixel gradient values of the edge points; through the synthetic judgment of a gradient threshold and a polarity direction, carrying out secondary curve fitting and smooth filtering on the point which conforms to a condition, and recording as a candidate straight line edge point; and then, using a straight line fitting algorithm based on an edge point distance weight to carry out multi-time iterative fitting on the candidate straightline edge point to obtain a straight line parameter, and calculating the point of intersection of the fit straight line and the ROI to obtain two end points of a final target straight line. The invention puts forward a high-accuracy straight line fitting algorithm based on the edge point distance weight, a multi-time iterative fitting strategy is used for greatly lowering the interference of an outlier and a noise pint for target straight line fitting, and therefore, the method has the advantages of high robustness, high accuracy and high anti-jamming ability.

Description

technical field [0001] The invention belongs to the technical field of machine vision and image processing detection, relates to sub-pixel line detection, and is an anti-interference sub-pixel line fitting method. Background technique [0002] With the development of industry, the size requirements of workpiece materials are getting higher and higher. Accurate detection of workpiece size and other information plays an important role in precision electronics manufacturing and precision machinery manufacturing. At present, most of the linear edge detection of workpieces in China is only at the pixel level, and due to the influence of workpiece processing factors, the anti-interference ability of the detection results is poor. Pixel-level, unstable line detection can no longer meet the needs of high-precision industrial manufacturing, which limits the development of high-precision industries. [0003] The traditional line detection technology usually uses edge detection operat...

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Problems solved by technology

[0006] The problem to be solved by the present invention is: In order to solve the problems of low precision of traditional pixel-level line detection and poor anti-interference ability, the present invention proposes an anti-interference sub-pixel line fitting method; the present invention effectively solves the problem of pixel-level edge The problem of insufficient detection accuracy can effectively suppress the interference of outliers on the edge of the line, and finally achieve the effect of high-precision and anti-interference detection of line information

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