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Image light stripe noise suppression method based on confidence evaluation

A confidence, light bar technology, applied in measurement devices, instruments, etc., can solve problems such as image light bar noise suppression, and achieve good noise suppression effect.

Active Publication Date: 2018-07-10
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The present invention mainly solves the problem of suppression of image light bar noise in the process of measuring workpiece size by using binocular stereo vision

Method used

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  • Image light stripe noise suppression method based on confidence evaluation
  • Image light stripe noise suppression method based on confidence evaluation
  • Image light stripe noise suppression method based on confidence evaluation

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Embodiment Construction

[0034] The specific implementation manners of the present invention will be further described in detail below in conjunction with the technical solutions and accompanying drawings.

[0035] attached figure 1 is a schematic diagram of the measurement system, showing the visual measurement system used and the field of view measurement system in which the forging 4 to be tested is a cylindrical workpiece. The model of the left and right cameras 3a and 3b used in the present invention is: SVCam-svs11002, and the diameter of shooting the cylindrical forging 4 to be tested is 500mm. The on-site measurement system is composed as follows: two SVCam-svs11002 cameras with a resolution of 4008×2672; two short-pass filters placed in front of the camera lens; a laser array 2 composed of lasers, and a graphics workstation 1 . Use the binocular camera to shoot the laser light strip on the surface of the forging under test, use the graphics workstation to process the pictures taken by the le...

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Abstract

The invention belongs to the field of computer vision measuring and relates to an image light stripe noise suppression method based on confidence evaluation in vision measuring. The method is characterized in that the pixel central point of the surface light stripe of a to-be-measured forged piece is extracted by a gray centroid method, a feature light stripe model is built through the imaging features of a left camera and a right camera, the relation between the laser incidence angle and the camera shooting angle and the surface geometry features of the to-be-measured forged piece, the confidence evaluation model of a light stripe center is built according to the extraction precision of the light stripe center and the reliability of an ideal feature light stripe model, and the light stripe model and the confidence evaluation model are used to perform confidence evaluation and gross error point removing on the extracted light stripe center. The image light stripe noise suppression method has the advantages that the gross errors in a feature light stripe image are removed through confidence evaluation, the noise interference of the feature information in the image is suppressed effectively, the matched and rebuilt light stripe information is allowed to conform to the three-dimensional shape of the to-be-measured forged piece, and size restoration precision is increased.

Description

technical field [0001] The invention belongs to the field of computer vision measurement, and relates to a method for suppressing image light bar noise in harsh environments in vision measurement. Background technique [0002] The measurement principle of binocular stereo vision is to obtain the geometric three-dimensional information of the object according to the two-dimensional image information of the two pictures taken by the binocular camera at the same time. In order to obtain the characteristic size of the object to be measured, it is necessary to project the light bar onto the surface of the object to be measured, use a camera to take a two-dimensional picture, extract the center point of the characteristic light bar in the two-dimensional picture and match it, so as to restore the object to be tested The three-dimensional feature information of the surface. Since the feature information of the light bar in the picture directly reflects the feature size information...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 贾振元刘巍樊超楠王亮刘阳王灵丽杨景豪徐鹏涛
Owner DALIAN UNIV OF TECH
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