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Mirror image type structure light vision measuring systems and measurement method

A technology of visual measurement and structured light, which is applied in the field of measurement, can solve the problems of large sensor size, achieve high measurement accuracy, increase the baseline distance, and reduce the workload

Inactive Publication Date: 2009-04-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional optical triangulation method directly adopts the triangular relationship formed by the camera, the structured light projector and the measured object. The lateral dimension requirement between the structured light projector and the camera in the structured light visual measurement sensor makes the sensor itself larger.

Method used

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  • Mirror image type structure light vision measuring systems and measurement method
  • Mirror image type structure light vision measuring systems and measurement method
  • Mirror image type structure light vision measuring systems and measurement method

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Embodiment

[0089] The MTC-54C0PI CCD camera of Taiwan Mintong Company, the LI650-2.5-3(5) red light linear spot laser of Xi'an Huake Optoelectronics Company and the Meter-II image acquisition card produced by Canada Matrox Company are used to form a mirror image A structured light vision measurement system. The image resolution is 768×576 pixels.

[0090] use as figure 2 The shown two-dimensional planar solid target 8 calibrates the parameters of the mirror-type structured light vision measurement system. The number of squares in the target is 3×3, the side length of the squares is 2mm, the spacing is 2mm, and the accuracy of the side length and spacing is 0.01mm.

[0091] The internal parameters of the calibrated camera are as follows:

[0092] f x = 818.926 pixels, f y =843.363 pixels

[0093] u 0 = 384.396 pixels, v 0 =310.059 pixels

[0094] k 1 =-0.2082,k 2 =0.0968

[0095] The light plane equation is:

[0096] 0.3057x-2.7639y+z=25.891

[0097] In order to evaluate th...

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Abstract

The invention belongs to the technical field of measurement, and provides a mirror-image type structured light vision measurement system, as well as a measurement method. The measurement system consists of a structured light projector 1, reflectors 2, 3 and 4, a camera 6, a bottom plate 7, a computer, an image acquisition card and a calibration plane target 8. The measurement method comprises the following steps: the structured light is projected through the structured light projector, reflected by the reflectors 2, 3 and 4, and then projected onto the surface of a measured object 5; a reflected light ray is reflected by the reflector 4 and then received by the camera 6; a formed image is acquired into the computer by the high-speed image acquisition card; the acquired image is processed so as to extract an image coordinate of the center line of the structured light; and the three-dimensional coordinate of the surface point of the object is figured out according to a measurement model. The invention adopts a principle that reflector imaging forms triangulation, reduces transverse space between the structured light projector and the camera, compresses system volume, and realizes the miniaturization of structured light vision sensors.

Description

technical field [0001] The invention belongs to the technical field of measurement, and relates to a mirror-type structured light vision measurement system and a measurement method. Background technique [0002] With the development needs of modern processing and manufacturing and production operations, small-size online measurement has gradually been highly valued at home and abroad. In small-scale measurement, the three-dimensional measurement of the surface of small objects located in a confined space is representative, such as dental impressions, tiny parts in the engine, component surfaces, comprehensive geometric parameters of integrated IC chips, and surface measurement of high-speed micro flywheels And wear measurement of small mechanical parts in working state. These components are generally small in size, and more critically, they are located in a confined space, and some parts are non-detachable. Therefore, it has become an urgent requirement for modern manufact...

Claims

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Application Information

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IPC IPC(8): G01B11/24G01B11/03
Inventor 周富强程骏超李颖张广军
Owner BEIHANG UNIV
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