To achieve full-field measurement of composite surface objects and expand the measurement range,this paper proposes a system parameter calibration method using a specular and diffuse calibration plate.This method captures phase information and calibration data for both specular and diffuse reflections at the same pixel point.Initially,a specular and diffuse calibration plate with a checkerboard pattern and known marker distances is designed and manufactured.Using the unique configuration of the calibration plate,the complete reference phase is derived through external parameter constraints and spline interpola-tion,facilitated by limit translation.Subsequently,spatial distance,system parameters,and the relation-ship between pixel position and horizontal coordinates XY are calibrated pixel-by-pixel within the same co-ordinate system.The 3D morphology of the composite surface object is then reconstructed using the com-plete reference phase and pixel-by-pixel calibration data.Experimental results indicate that this method ex-tends the measurement range by 1.5-2 times compared to traditional non-full-field methods.The proposed approach not only maintains measurement accuracy but also enables full-field measurement of 3D morphol-ogy of discontinuous composite surfaces,proving to be of significant practical value for measuring the 3D morphology of composite surface objects.
关键词
系统标定/镜面和漫反射面标定板/复合表面/全场测量
Key words
system calibration/specular and diffuse calibration plate/composite surface/full-field mea-surement
维普
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