二值时空编码照明三维测量中的冗余编码方法

在采用二值时空编码结构照明的三维测量中,由于遮挡、阴影及光学系统的低通滤波特性等原因导致被测物体部分区域解码错误或无法解码.为减轻这些因素对测量结果的影响,提出了一种采用冗余编码的二值时空编码照明三维测量方法.该方法在空间相邻区域设置相同编码,以时间坐标进行区别.解码时,根据编码的冗余性对结果进行校验、残缺编码恢复.与原有编码相比,在不增加投影模式数量的情况下,获得了更多的有效点数,提高了解码的可靠性,并为进一步的纠错提供了更多信息.

Redundancy Encoding Method for Three-dimensional Shape Measurement Based on Binary Spatio-temporal Encoded Illumination

In three-dimensional shape measurement,some regions of the objects are unable to be decoded or decoded incorrectly,using binary spatio-temporal encoded illumination due to occlusion,shadow and low-pass filter characteristic of the optical systems etc.To mitigate the problem,a redundancy encoding method was proposed.Two adjacent sections were encoded with the same code and distinguished with their temporal coordinates.According to the redundancy encoding method,measurement results can be checked and some sections can be recovered from incomplete codewords during decoding.Compared with the original method,more valid points were obtained and the reliability of the decoding results were improved with proposed method,which presents more information for error correction.