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Fast calibration method of active projection three dimensional measuring system based on two-dimension multi-color target

A measurement system and target technology, applied in the field of system calibration, can solve problems such as cumbersome data processing

Inactive Publication Date: 2009-11-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires phase unwrapping operations, and the data processing is cumbersome

Method used

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  • Fast calibration method of active projection three dimensional measuring system based on two-dimension multi-color target
  • Fast calibration method of active projection three dimensional measuring system based on two-dimension multi-color target
  • Fast calibration method of active projection three dimensional measuring system based on two-dimension multi-color target

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Embodiment Construction

[0048] The following will be described in conjunction with a specific example, which does not include all the content of this patent.

[0049] In this example, the image made on the flat target is a red and blue checkerboard pattern, such as figure 2 As shown in , the image projected onto the target is a white and magenta checkerboard image, such as image 3 As shown in , the color camera acquires the mixed color image after the projected image reaches the target, such as Figure 4 As shown, using the reasonable color design of the two checkerboards, the red and blue channels can be separated such as Figure 5 and 6 shown, corresponding to the checkerboard image physically present on the target, separated in the green channel as Figure 7 As shown, the checkerboard image projected onto the target; then the camera is calibrated by the checkerboard image physically existing on the target, and the projector is calibrated by the checkerboard image projected on the target; fina...

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Abstract

The invention discloses a projector and camera simultaneous fast calibration method used for an active projection illumination three dimensional appearance measuring system. The method utilizes a reasonable color design and utilizes the projector for projecting an image with multi-color characteristic points onto a two-dimension planar target with multi-color characteristic points on the basis of the RGB model of a multi-color image; a multi-color camera obtains two images after color blending in a color space of multi-color patterns on the target simultaneously at one time; information of a characteristic point image made on the target and information of a characteristic point image of projection are obtained by image separation; and then the method respectively utilizes the separated characteristic point image made on the target to calibrate the camera, utilizes the separated characteristic point image of projection to calibrate the projector and finally utilizes the principle of binocular stereovision to calibrate the relative position relationship of the camera and the projector, thus completing the calibration of the whole active illumination three dimensional appearance measuring system. As just one image is needed to be shot at each calibration position, the method has the advantages of less measuring data and fast calibration speed.

Description

technical field [0001] The invention relates to the field of system calibration in a three-dimensional surface shape measurement system, in particular to the simultaneous calibration of a camera and a projector based on an active projection illumination three-dimensional measurement system. Background technique [0002] Camera calibration is an essential step in 3D reconstruction. The quality of the calibration results directly affects the accuracy of 3D measurement and the quality of 3D reconstruction results. Therefore, the study of camera calibration methods has important theoretical research significance and practical application value. [0003] The camera model solves the problem of two-dimensional image information and three-dimensional space coordinate transformation, generally speaking, there are two types of linear models and nonlinear models. The linear camera model (pinhole camera imaging model) is the most widely used one, and many visual measurement techniques a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25G06T7/00
Inventor 张启灿王庆丰刘元坤
Owner SICHUAN UNIV
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