一种光刀式义齿三维轮廓测量系统标定方法

Calibration Method for 3D Profile of Denture Based on Light Sectioning Measurement

为了提高数字化口腔测量系统的测量精度,文中基于光刀式测量法,提出了一种用于测量义齿三维轮廓的系统标定方法.采用具有一定斜面的立方体作为标定块,通过标定块的单方向平移,确定出每一个高度下空间物理位置点在摄像机成像平面的像素值,对标定范围内所有像素点进行标定,得到网格式的标定结果.该标定方法经实验验证,结果表明:标定后测量系统的测量精度达到0.04mm,对高度标定具有连续性;通过标定块的两次平移可以完成整个标定过程;较传统义齿三维轮廓测量系统标定方法,标定灵活性增强,标定原理简化,标定速度快.

In order to improve the measurement accuracy,a light sectioning measurement based calibration method of the 3Dprofile of denture is proposed.A cube with certain slope is used as the calibration block,which is unidirectionaly translated to get the pixel value in the camera image plane for every point of each height in space,and obtain grid-style calibration parameters.The test results prove the measurement.The accuracy of measurement reaches 0.04 mm and the continuity of height calibration is achieved.All the information of the calibration can be obtained through twice unidirectional translation of the block.It is more flexible than the ordinary methods and has a good performance of speed and accuracy.