Method and device for measuring axial displacement by taking one-dimensional contrast of three primary colors as feature

Abstract

The invention provides a method and a device for measuring axial displacement by taking one-dimensional contrast of three primary colors as a feature. The device is formed by connecting a common computer with a computer camera, a stepping motor and an interface circuit of the stepping motor, and a camera axial displacement device through a universal serial bus (USB) interface of the common computer; the camera is arranged on the axial displacement device and driven by the stepping motor; the stepping motor is connected to an RS232C interface of the computer through the interface circuit of the stepping motor; and the computer is configured with a camera shooting program and a program for measuring the axial displacement according to the one-dimensional contrast of the three primary colors. The method comprises the following steps of: automatically analyzing and selecting the best observing region by taking the one-dimensional contrast of the three primary colors as the feature of the image frame of a detected object, and calculating an autocorrelation matching coefficient of the pixel brightness; judging the imaging focused degree of the object by metering the number of image features in the observing window region; and measuring the micro displacement of the object in the direction of an optical axis of the camera. The method for measuring the axial displacement is novel and can adapt to the variation of ambient light to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of digital image measurement, in particular to a method and a device for measuring the tiny displacement of an object along its optical axis using a computer camera. Background technique [0002] The recently filed invention patent application "Method and device for measuring displacement along the optical axis direction based on the contrast ratio of three primary colors" analyzes the technology for detecting the displacement occurring along the optical axis direction of the system, and proposes a novel method for detecting axial displacement The method and the device thereof make full use of the information contained in the image frame captured by the camera, however, the analysis calculation amount is relatively large, which affects the measurement speed. Contents of the invention [0003] The invention provides a method and device for measuring axial displacement characterized by three primary colors a...

AI Technical Summary

Problems solved by technology

[0002] The recently filed invention patent application "Method and device for measuring displacement along the optical axis direction based on the contrast ratio of three primary colors" analyzes the technology of detecting the displacement occurring along the optical axis direction of the system, and proposes a novel detection axial displacement The method and its device make full use of the information contained in the image frame captured by the camera, but the analysis and calculation amount is relatively large, which affects the measurement speed

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