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Method and device for measuring tiny two-dimensional displacement by computer camera

A two-dimensional displacement and camera technology, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problem of low image capture frame rate and achieve good lighting effect

Inactive Publication Date: 2011-01-12
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the image capture frame rate is very low and can only adapt to slower motion situations

Method used

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  • Method and device for measuring tiny two-dimensional displacement by computer camera
  • Method and device for measuring tiny two-dimensional displacement by computer camera
  • Method and device for measuring tiny two-dimensional displacement by computer camera

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Embodiment Construction

[0061] figure 1 is a block diagram of the measuring device of the present invention. Wherein the computer camera (1) is aimed at the object to be measured, and the distance between the two is within the effective focusing and imaging range of the optical lens of the camera (1). Described camera head (1) is made up of optical lens (2), photoelectric sensor chip (3) and USB interface (4), is connected to the USB interface (6) of a common computer system (5) by its configured USB cable , the computer system (5) is also equipped with a CPU (7), a memory (8), a display card and a display (9), a hard disk (10), a keyboard and a mouse (11), an operating system (12), a camera driver ( 13) and a specially written camera shooting and digital image processing program (14).

[0062] The steps for measuring the tiny two-dimensional displacement of an object using a computer camera include:

[0063] 1. Run the camera driver (13) distributed with the camera (1) on the computer, and connec...

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Abstract

The invention discloses a method and a device for measuring tiny two-dimensional displacement by a computer camera, providing a method and a device for measuring displacement in a non-contact mode by taking a computer camera as a displacement sensor. The device is formed by connecting the computer camera with a common computer. The computer is also provided with a camera shooting and digital image processing program, so that the computer can obtain the tiny two-dimensional displacement vector and velocity vector of a measured object on a plane which is vertical to the optical axis of the camera under the situation that the lighting condition is good and relatively constant; and the measurement precision is less than one pixel unit. The method for measuring displacement of the invention comprises: by means of autocorrelation calculation carried out on a reference frame, selecting an optimal matching comparison window; by means of cross correlation matching calculation, obtaining the instant relative displacement vector and the total displacement vector of the object; according to the measuring result, determining whether to update the reference frame and the optimal matching comparison window thereof; and automatically regulating to search the magnitude of the matched cross correlation operator array.

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 two-dimensional micro-displacement of an object by using a computer camera. Background technique [0002] The development of microelectronic technology has promoted the progress of photogrammetry technology. With the keywords of "camera" and "measurement", 25 domestic invention patents and 5 utility model patents can be retrieved. For example, the invention patent "A method for measuring the three-dimensional position and attitude of the camera space" (publication number: CN 1804541A, application date: 2006.7.19, Beihang University) proposes the measurement steps as follows: 1) In the calibration stage, set the cooperation target; the camera field of view In , freely and non-parallelly move the cooperative target at least 5 positions, and each time a position is moved, an image is taken, which is called the camera calibration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
Inventor 曾艺朱超平林睿唐玉霞
Owner CHONGQING TECH & BUSINESS UNIV
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