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Mixed image processing process of structure light striation central line extraction

A light stripe center and processing method technology, which is applied in image data processing, image analysis, and the use of optical devices, can solve problems such as difficult to quickly extract the centerline of light stripes, a large amount of calculation, and difficulty in meeting real-time requirements. Improve real-time performance, reduce redundant calculations, and avoid the effect of large template Gaussian convolution operations

Inactive Publication Date: 2008-05-14
BEIHANG UNIV
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Problems solved by technology

The fringe center extraction method based on the Hessian matrix includes at least 5 large-template Gaussian convolution operations on the entire image, so the amount of calculation is very large, and it is difficult to quickly extract the centerline of the light fringe, and it is difficult to meet the high real-time requirements of the application. , such as rail wear dynamic detection

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  • Mixed image processing process of structure light striation central line extraction
  • Mixed image processing process of structure light striation central line extraction
  • Mixed image processing process of structure light striation central line extraction

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Embodiment Construction

[0019] The present invention will be described in further detail below. First, the basic principle of the stripe center extraction method based on Hessian matrix is ​​briefly introduced.

[0020] The basic idea of ​​the fringe center extraction algorithm based on the Hessian matrix is ​​as follows: first, take any point on the light strip, calculate the Hessian matrix of the point, select the eigenvector corresponding to the maximum eigenvalue of the Hessian matrix as the normal direction of the point, and then In the normal direction, Taylor expansion is used to obtain the sub-pixel coordinates of the center pixel point on the stripe, and the center points belonging to the same stripe are connected to form the stripe center line.

[0021] The normal direction of the fringe is the direction where the absolute value of the second-order directional derivative in the image z(x, y) (where x, y are the horizontal and vertical coordinates of the image respectively) takes the maximum...

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Abstract

The invention relates to a hybrid image processing method of extracting the centric line of the structured-light stripe based on the ROI area, belonging to the field of machine vision technique. By combining the image threshold processing, communicated components extraction, shape factor constraint and expansion method, the invention automatically divides the structured light area as the ROI area of light stripe extraction, using the extraction method of fringe center based on Hessian matrix to realize the extraction of sub-pixel image space of the centric line of the structured-light stripe of the ROI area. The method has the advantages of high precision, good robustness, high automation degree and other advantages, avoiding the large formwork Gaussian convolution calculation of the pixel the non-light stripe area, thereby reducing the redundant calculation of the extraction of the structured light stripe and realizing the high speed and precision extraction of the centric line of the light stripe, laying a foundation for the real-time application of the structured light 3D vision measurement.

Description

technical field [0001] The invention belongs to the technical field of machine vision, and relates to a hybrid image processing method for extracting the central line of structured light strips. Background technique [0002] Structured light vision 3D measurement has the characteristics of non-contact, fast dynamic response, and good system flexibility. It is widely used in many fields such as rapid product design, processing quality control, reverse engineering, and automatic control. The structured light vision 3D measurement technology projects the corresponding pattern of structured light to the measured object, and the camera captures the deformed light strip image, and obtains the 3D information of the object surface based on the principle of optical triangulation. The most effective way to obtain many online measurements such as sports information. [0003] In the structured light vision measurement system, the structured light strip is modulated by the depth change ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/40G01B11/00G01B11/24
Inventor 周富强陈强张广军
Owner BEIHANG UNIV
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