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Method and device for frame matching displacement measurement by using two-dimensional single color contrast ratio as characteristics

A contrast and feature frame technology, applied in the field of two-dimensional micro-displacement, can solve the problems of affecting the measurement speed and the large amount of analysis and calculation, and achieve the effect of overcoming the influence of measurement, improving the measurement speed and reducing the amount of analysis and calculation.

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

The measurement methods of the two patents are novel, but the former has a large amount of analysis and calculation, which affects the measurement speed, and the latter will be affected by the relevant wavelengths of light and its changes in the measurement environment

Method used

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  • Method and device for frame matching displacement measurement by using two-dimensional single color contrast ratio as characteristics
  • Method and device for frame matching displacement measurement by using two-dimensional single color contrast ratio as characteristics
  • Method and device for frame matching displacement measurement by using two-dimensional single color contrast ratio as characteristics

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Embodiment Construction

[0037] figure 1 A block diagram showing the measuring device of the present invention.

[0038] On the computer system (5), run the camera driver program (13) for distribution, and connect the camera (1) to the computer (5) through USB interfaces (4) and (6). Then, let the camera focus and image the object to be measured. Run the camera shooting and two-dimensional single primary color edge direction data frame matching measurement displacement program (14) to implement real-time displacement measurement. The program (14) includes a method for measuring displacement by using two-dimensional monochrome contrast as characteristic frame matching, and the specific steps are described in "Summary of the Invention".

[0039] During the measurement process, changes in lighting conditions should not significantly change the contrast between light and dark in the image of the measured object. The target can be made of a material with finer surface reflection characteristics.

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Abstract

The invention discloses a method and a device for frame matching displacement measurement by using a two-dimensional single color contrast ratio as characteristics. The device consists of a computer and a camera of the computer. The method for measuring the displacement comprises: selecting a primary color, and extracting the two-dimensional contrast ratios along an x-axis direction and a y-axis direction of the single primary color as the characteristics of an image frame respectively; selecting a frame of image as a reference frame, performing the cross correlation match operation on data in the two frame edge directions of the selected single primary color in the selected comparison window area relative to consequently sampled frames, and using the average of the optimal matching as the measuring result of this time; and determining if to update the reference frame and adjusting the position of the comparison window and the range of the cross correlation matching operator array according to the measured value so as to ensure the measuring precision for the next time and reduce operation amount. By the method and the device, the influences of other wavelengths of the radiation in the environment on the measurement can be effectively eliminated and the measuring speed is greatly improved.

Description

technical field [0001] The invention relates to the technical field of digital image measurement, in particular to a method and a device for measuring two-dimensional micro-displacement of an object by using a computer camera. Background technique [0002] In order to play the function of the photoelectric sensor array of the computer camera, the recently submitted invention patent "Method and device for measuring displacement by two-dimensional three-primary color contrast as characteristic frame matching" (application number: 200910191320.9) decomposes the image frame into three primary color frames, respectively Extract their respective primary color contrast as the feature of their image, and apply the correlation matching technology to measure the tiny displacement of the object, take the average value as the measurement result, and make full use of the performance of the photodetection sensor. Another invention patent, "Method and Device for Measuring Displacement by F...

Claims

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Application Information

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IPC IPC(8): G01B11/02
Inventor 曾艺张海明徐其明
Owner CHONGQING TECH & BUSINESS UNIV
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