Method for calibrating camera and colour reference thereby

A camera calibration and reference object technology, which is applied in the field of color reference objects, can solve the problems of difficult detection of the center of the disc, the inability to restore internal parameters, and no clear signs, etc., to achieve small shadow effects, strong practical value, and accurate automatic detection results Effect
CN100492413CInactive Publication Date: 2009-05-27BEIJING BEIKE GUANGDA INFORMATION TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING BEIKE GUANGDA INFORMATION TECH
Publication Date
2009-05-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a method for calibrating camera, comprising the steps: placing a object to be shot above a cylindrical reference object; positioning the image coordinates of the reference point; resuming the internal and the external parameters of the camera when it takes each picture in the TSAI method. This invention has the advantages that the reference object is not sheltered, the shadow effect is small, the reference point is not on the same plane, the shooting operation is simple and the automatic detecting result is accurate. And it can be applied to piece the panoramic picture of an object, make the model based on the image and so on in the case that the camera must be calibrated, the equipment being very simple without need of complex and expensive instruments and apparatus.
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Description

technical field

[0001] The invention relates to a method for calibrating a camera and a used color reference object. Background technique

[0002] Camera calibration is one of the key technologies in virtual reality. The purpose is to restore the internal and external parameters of the camera when each photo is taken. Especially in image-based modeling systems, camera calibration is a very critical link. The accuracy of camera parameters will be Greatly affects the effect of subsequent model restoration.

[0003] At present, there are two general calibration methods: one is the self-calibration method, and the other is the active calibration method. The self-calibration method is a calibration method that does not need any reference objects and external devices, so this method has wide applicability, but the accuracy of this method is not high at present, so it cannot be practical. The active calibration method is a popular method in recent years. According to the differen...

Claims

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