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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

Inactive Publication Date: 2009-05-27
BEIJING BEIKE GUANGDA INFORMATION TECH
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AI Technical Summary

Problems solved by technology

The color template method uses the TSAI method to restore the camera parameters. If all the reference points are coplanar, the TSAI method can only restore 6 external parameters and 4 internal parameters, and cannot restore the internal parameter S x
[0015] ■It is difficult to detect the center of each disc
The center of the disc is not clearly marked. Due to the influence of noise and image distortion, it is sometimes difficult to accurately find the center of each concentric circle in the captured image.

Method used

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  • Method for calibrating camera and colour reference thereby
  • Method for calibrating camera and colour reference thereby
  • Method for calibrating camera and colour reference thereby

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Embodiment Construction

[0032] The following describes the design of the reference object and the automatic detection algorithm of the color pattern in conjunction with the accompanying drawings.

[0033] Color reference design

[0034] The design of the reference object pattern makes full use of the combination of different colors to form various patterns, and the center point of each pattern is the calibration point. The pattern design meets the following two basic conditions:

[0035] ■The difference between the basic colors is large enough. At the same time, choose as many colors as possible as the basic color, so that the number of reference patterns that can be combined will be sufficient.

[0036] ■The center point of the reference pattern must be easily discernible. Considering that in some cases, it is better for the user to properly perform manual intervention, the central point can be easily recognized by the computer and should be easily recognized by human eyes.

[0037] First consid...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/10G03B19/02
Inventor 杨猛陈毅松汪国平
Owner BEIJING BEIKE GUANGDA INFORMATION TECH
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