基于条纹边缘解码的结构光三维测量技术

he key problem in 3D vision measurement based on structured light is to acquiring projecting angle of projecting light accurately. Based on triangle equation, method for acquiring projecting angle by encoding and decoding with fringe edge of Gray code is presented. The method encoded with even Gray code fringe and decoded with pixel point located by a sub-pixel location method named edge-directed, so inherent one-bit decoding error was removed. Accuracy of image sampling point location and correspondence between image sampling point and object sampling point achieved sub-pixel degree. In addition, measurement error caused by dividing projecting angle irregularly by even-width encoding fringe was analysed and corrected. Finally, 3dsmax and Matlab software were used to simulate measurement system and reconstruct measured surface. Indicated by experimental results, measurement error is about 0.05%.