Projecting structural optical space position and shape multi-point fitting calibrating method

Abstract

A multi-point fitting demarcate method about space location and figure of projection configuration light belongs to optical technology field. Inside effective range to angular field of configuration light three-dimensional imaging system, projector brings projection configuration light; change space position of the referenced surface time after time then two-dimensional imaging equipment takes pictures to space camber and referenced surface of projection configuration light and input into computer. It changes the relationship between the method of Field and Value and the space position to work out the coordinate value of multi-point on many lines intersecting with each other, inside the coordinate system to configuration light projection three-dimensional imaging system. Then get high precise demarcate of configuration light space position and figure by multi-point fitting. It is easy and handy to operate and suitable to locating demarcation and debugging for configuration light projection three-dimensional imaging system.

Description

technical field [0001] The invention relates to a calibration method in the field of optical technology, in particular to a multi-point fitting calibration method for the spatial position and shape of projected structured light. Background technique [0002] The application of structured light three-dimensional surface imaging system is becoming more and more extensive. Among them, the accuracy of spatial position and shape parameters of projected structured light is directly related to the accuracy of three-dimensional measurement data. Therefore, how to achieve high-precision calibration of the spatial position and shape of projected structured light has important research significance for ensuring the accuracy of 3D measurement. However, in some existing systems that use structured light to achieve 3D imaging, most of the structured light is estimated visually, and human factors are greatly affected. However, the main problems in the calibration method of projected struct...

AI Technical Summary

Problems solved by technology

However, in some existing systems that use structured light to achieve 3D imaging, most of the structured light is estimated visually, and human factors are greatly affected. However, the main problems in the calibration method of projected structured light are: (1) will The projection of structured light is assumed to be a plane, which is too simple. Due to the inevitable errors in the production and installation of the projection device used to generate structured light, especially the structured light projection device represented by the projector inevitably has optical distortion. The projected structured light emitted by the device is often deformed, so only assuming the projected structured light as a plane has major defects in practical applications; (2) the structure of the existing projected structured light calibration device is very complicated and requires a special workbench. High operating requirements

[0003] After searching the documents of the prior art, it is found that the Chinese Patent Publication (Notice) No. CN1570553A, titled "Comprehensive Calibration Method for Surface Optical Measurement System", although the comprehensive calibration of camera, projector and measurement system is proposed, this method only The projector has been calibrated, and the optical parameters of the projector have been calibrated, but the calibration of the structured light itself has not been completed. The calibration of the projection structure generated by any other device has no wide application value.

In addition, this method first requires a special calibration plate, and its accuracy and consistency are not easy to control, which directly affects the calibration accuracy

And during the calibration process, when the calibration board is placed obliquely, it is very difficult to make the diamond-shaped square grid array projected by the projector just in the white gap of the calibration board. The calibration data within the field angle range makes it difficult to improve the accuracy and poor operability

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