Target correction method and system

A calibration method and target technology, which is applied in the field of three-dimensional measurement and machine vision technology, can solve the problems of difficulty in guaranteeing coordinate accuracy, time-consuming and labor-intensive problems, and achieve low cost, simple operation and high precision

Active Publication Date: 2012-03-14
SHENZHEN ESUN DISPLAY
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Problems solved by technology

For general planar targets, taking circular markers as an example, the shape (roundness and edge) of the markers can meet the accuracy requirements, but the coordinate accuracy of the center of the circle i

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  • Target correction method and system
  • Target correction method and system

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] In the embodiment of the present invention, the target is first photographed from different angles, multiple images are obtained, the centers of the marker points in each image are respectively extracted as feature points, the corresponding relationship between the marker points with the same name is established in each image, and the three-dimensional coordinates of the feature points are calculated. The three-dimensional coordinates of the feature points are constrained by the scale factor. Finally, the scale factor is obtained, and the three-dimensional coordinates of each feature point ar...

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Abstract

The invention is applicable to the field of machine visual and three-dimensional measurement and provides a target correction method and system. The embodiment of the invention provides the target correction method, comprising the following steps of: photographing a target from different angles to obtain a plurality of images; respectively extracting the center of a marking point in each image as a characteristic point and establishing a corresponding relation of the marking points with the same name between the images; combining a close-range photogrammetry technology to calculate a three-dimensional coordinate of the characteristic point, wherein the three-dimensional coordinate is restrained by a scale factor; finally obtaining the scale factor and zooming the three-dimensional coordinate of each characteristic point to an actual size. The target manufactured and corrected by the method has the advantages of higher precision, easiness for operation and low cost. Meanwhile, the scale factor is obtained by adopting a fringe projection measurement system and a standard ball, the correction precision is higher and the relative precision (absolute precision/target size) can reach 1:1000. Therefore, the method and the system provided by the invention can be widely applied to the vision measurement and the system calibration.

Description

technical field [0001] The invention belongs to the field of machine vision technology and three-dimensional measurement, and in particular relates to the production and correction of a target for camera calibration. Background technique [0002] Camera calibration is a key technology in the field of computer vision and three-dimensional measurement, and camera calibration requires a high-precision target, and the accuracy of the target determines the accuracy of camera calibration and measurement. Usually a high-precision target is complicated to manufacture and process, and the cost is high; at present, there are usually two ways to obtain a two-dimensional planar target with an accuracy of micron level: the first one requires high-precision processing equipment, In order to ensure that the distance accuracy of the marking points on the target reaches the micron level; the second is to use a two-dimensional imager with micron level precision to measure the distance or coor...

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Application Information

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IPC IPC(8): G06T7/00
Inventor 刘晓利彭翔殷永凯何懂
Owner SHENZHEN ESUN DISPLAY
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