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Method and device for measuring two-dimensional infinitesimal displacement with single primary color by using computer camera

A two-dimensional displacement and camera technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of affecting the measurement speed, impact, and heavy computing workload

Inactive Publication Date: 2011-06-22
CHONGQING TECH & BUSINESS UNIV
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Problems solved by technology

However, the calculation workload of this method is large, which affects the measurement speed
The newly submitted invention patent "Method and device for measuring small two-dimensional displacement using computer camera" (application number: 200910104277.8) although its measurement speed is faster, the object of this measurement method to implement frame-frame correlation matching is the image frame Brightness, affected by various wavelengths irradiated in the measurement environment

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  • Method and device for measuring two-dimensional infinitesimal displacement with single primary color by using computer camera
  • Method and device for measuring two-dimensional infinitesimal displacement with single primary color by using computer camera
  • Method and device for measuring two-dimensional infinitesimal displacement with single primary color by using computer camera

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Embodiment Construction

[0030] The method for measuring the tiny two-dimensional displacement of an object using a single primary color of a computer camera includes several steps, which have been clearly explained in the technical solution in the "Content of the Invention". For the concept of calculating frame matching self-correlation or cross-correlation coefficients, please refer to the aforementioned two recently submitted invention patents and figure 2 And attached image 3 .

[0031] As stated in step 8) of the camera shooting and single primary color frame matching program (14), "..., that is, the relative displacement of the comparison window in the reference frame has exceeded half of the comparison window, At this time, the latest sampling frame is used to replace the reference frame, and its comparison window is repositioned at the central part of the new reference frame," and a specific condition for updating the reference frame is proposed here. The basic principle of updating the re...

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Abstract

The invention relates to a method and device for measuring two-dimensional infinitesimal displacement with a single primary color by using a computer camera, and further provides a method and device for contactless displacement measurement with a computer camera. The device comprises a computer and a computer camera, and is provided with a camera shooting and single-color frame matcher. In the invention, the texture of a reflective surface of an object to be measured can be analyzed by adopting a brightness self-association coefficient calculation method and the size of a comparison window is automatically regulated; one of three primary color frames is selected as an object to be measured, primary color frames selected for a former and a later frames are subjected to a cross correlation matching computation to determine that the highest frame-frame correlation degree is achieved when the cross correlation coefficient value is minimum and close to zero, thereby an instant displacement, a total displacement and an instant speed are obtained; whether to upgrade a reference frame or regulate the position of the comparison window is determined according to result on the instant displacement, the total displacement and the instant speed, the size of a cross association operator array which is used for search matching is regulated automatically; therefore, the method and the device are favorable for overcoming the impacts of other wavelengths and changes to the measurement, and further improving the measurement speed.

Description

technical field [0001] The invention relates to a method and device for digital image measurement, in particular to a method and device for measuring two-dimensional micro-displacement of an object by using a computer camera. Background technique [0002] The recently submitted invention patent "Method and device for measuring small two-dimensional displacement using three primary colors of a computer camera" (application number: 200910191317.7) proposes a frame-to-frame matching using the three primary color patterns of image frames, and the results of each primary color frame A method and device for obtaining a two-dimensional displacement by the average value thereof. However, the calculation workload of this method is large, which affects the measurement speed. The newly submitted invention patent "Method and device for measuring small two-dimensional displacement using computer camera" (application number: 200910104277.8) although its measurement speed is faster, the o...

Claims

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Application Information

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IPC IPC(8): G01B11/02
Inventor 曾艺张海明胡明卫罗清华
Owner CHONGQING TECH & BUSINESS UNIV
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