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A Precise Positioning Method for Circular Objects with Thickness Interference

A positioning method and precise positioning technology, which is applied in the directions of instruments, calculations, character and pattern recognition, etc., can solve the problem of large rotation angle error and achieve real-time detection, accurate detection and precise positioning, and high positioning accuracy.

Active Publication Date: 2020-07-28
FUDAN UNIV
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Problems solved by technology

But since y=cos -1 (x) The function curve is relatively steep near x=1, when or When it is close to 1, even if the detected c and d errors are small, the error of the calculated rotation angle will be large

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  • A Precise Positioning Method for Circular Objects with Thickness Interference
  • A Precise Positioning Method for Circular Objects with Thickness Interference
  • A Precise Positioning Method for Circular Objects with Thickness Interference

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Embodiment Construction

[0046] The present invention is further described below in conjunction with the accompanying drawings, but the scope of the present invention is not limited in any way.

[0047] 1. Operation process

[0048] Such as figure 1 As shown, the framework of the present invention can be divided into three parts: contour extraction of noise-removing points, processing of rotating mirror images, and precise positioning. In the stage of contour extraction of noise-removing points, thickness noise is removed by calculating the density of edge points. Based on the judgment of the position relationship between the center of the noise point and the major axis of the ellipse detected by the Hough transform detection, the target precise positioning part uses the detected ellipse information to perform precise target positioning through the precise positioning algorithm.

[0049] Second, the specific implementation process

[0050] The precise detection and positioning method of a circular o...

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Abstract

The invention belongs to the technical field of machine vision image processing, in particular to a precise positioning method for a circular object with thickness interference. The present invention adopts the method of removing thickness noise based on edge point density to eliminate the interference of thickness noise on circular objects, and at the same time solves the rotation mirror problem by using the center position relationship of noise points, and calculates the direction of object rotation; In the case of a cylinder, use the center offset algorithm to calculate the size of the object's rotation angle. The specific steps include: extracting the edge profile after removing the noise generated by the thickness based on the edge point density; rotating and mirroring processing based on the thickness noise center; and precise positioning of the target based on the center point offset. The invention is especially suitable for quickly realizing accurate detection and positioning of circular objects with thickness interference in industrial scenarios. This method has high positioning accuracy, high processing speed and good anti-noise ability.

Description

technical field [0001] The invention belongs to the technical field of machine vision image processing, and in particular relates to a method for precise detection and positioning of a circular object in an industrial scene. Background technique [0002] Image processing technology is usually the core part of a vision system, and the edge point extraction and ellipse detection involved in the present invention are one of the most important research methods in the field of image processing. [0003] When people observe an object, the perceived edge is usually a place where the color has obvious changes, and the mathematical representation of this change in the image is the edge detection operator. The commonly used operators include Roberts operator, Sobel operator, Prewitt operator, Laplacian operator, and Canny operator. Although these traditional algorithms based on edge detection operators can extract edge pixels, many noise points will be mistaken for edges at the same ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/20G06K9/40G06K9/46
CPCG06V10/22G06V10/30G06V10/44
Inventor 张文强罗燕飞罗琳耀路红张睿郑骁庆陈辰薛向阳
Owner FUDAN UNIV
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