Angle detection device and method based on machine vision

Abstract

The invention discloses an angle detection device based on machine vision. The angle detection device comprises a casing and a rotary table arranged inside the casing, wherein a rotating shaft is arranged in the center of the rotary table; at least two identifications with same shapes but different sizes are arranged on the rotary table; the at least two identifications are overlapped in centers and are circles, parallelograms, regular triangles or polygons with sides of positive even numbers; at least one encoding strip identification is arranged between the identifications; center lines of encoding strip identifications penetrate through the center; codes corresponding to every two encoding strip identifications are different; and the device further comprises an image acquisition device used for acquiring an image of the rotary table and a lighting source. The invention further provides an angle detection method based on the machine vision at the same time. The angle detection device is simple in structure, high in pollution resistance and higher in impact resistance of the rotary table. According to the angle detection method, detection errors caused by pollutants can be identified and removed through an image processing technology, and the detection accuracy is high.

Description

technical field [0001] The invention relates to the technical field of encoders, in particular to a machine vision-based angle detection device and method. Background technique [0002] The rotary encoder is a device used to measure the rotational speed. It converts mechanical quantities such as angular displacement and angular velocity of the output shaft into corresponding electrical pulses and outputs them in digital quantities. Rotary encoders can be divided into optical grating principle encoders and magnetic magnetic grating principle encoders. The principle of grating The rotary encoder includes a photoelectric code disc with a rotating shaft in the center. There are ring-shaped and dark engraved lines on the photoelectric code disc. A-phase and B-phase pulse signals with phase difference, A-phase and B-phase pulse signals are converted from frequency to voltage to obtain a voltage signal proportional to the rotating shaft speed, and the speed value and displacement ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of poor anti-pollution ability of grating rotary encoders and low measurement accuracy of magnetic grating rotary encoders in the prior art, to provide an angle detection device based on machine vision, and to provide a device based on The angle detection method of machine vision improves the anti-pollution ability and impact resistance while realizing accurate detection

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