基于边界信息的结构光编解码方法  

A Method of Structured Light Coding and Decoding Based on the Boundary Information

作　　者：秦绪佳[1,2] 赵海[1] 张勤锋[1] 郑红波[1,2] 梁震华 

机构地区：[1]浙江工业大学计算机科学与技术学院,杭州310032 [2]浙江省可视媒体智能处理技术研究重点实验室,杭州310032 [3]浙江华震数字化工程有限公司,嘉兴314100

出　　处：《计算机辅助设计与图形学学报》2014年第6期879-888,共10页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(61075118);浙江省自然科学基金(Y1080436)

摘　　要：针对传统结构光编解码算法在处理有遮挡、阴影的光栅条纹时会导致错误的解码,且得到的不同编码值条纹会出现重叠现象的问题,通过采用改进的Canny算子提取黑白条纹之间的边界,提出一种基于边界信息的结构光精确编解码算法.根据结构光条纹图像的特点对Canny算子进行改进,使其适用于条纹边界精确提取.在结构光编解码方法中,首先建立描述结构光图像序列条纹边界的编解码二叉树,然后设计边界定位和解码算法来求解未知边界的编码值,再构造边界匹配算法来消除不同编码值条纹部分重叠的问题,最后实现对由于遮挡、阴影引起的断开边界的解码.实验结果表明,该算法对条纹进行解码的精度更高、误判率更低,并且对形状复杂的物体的条纹图像具有较好的抗干扰性.When processing the structured light stripes with obstructions and shadows,the conventional decoding algorithms can lead to erroneous decoding and cause problems that stripes with different coded values overlapped.In this paper an improved Canny edge-detection method to extract the boundaries between the black and white stripes is proposed,and a precise coding and decoding algorithm for structured light based on the boundaries information is presented.Considering the features of the stripes,the Canny edge-detection algorithm is improved to extract the stripes boundaries precisely.The proposed coding and decoding methods for structured light include following steps.Firstly,build codec binary tree to describe the structured light image sequence stripes boundary.Then design boundary location and decoding algorithm to solve the unknown boundary code value.Thirdly,design boundary matching algorithm to eliminate different code value stripes overlapped.Finally,decode the disconnected boundaries caused by obstructions and shadows.The experiments show that the good results can be obtained by the algorithm.It has higher decoding accuracy,fewer errors,and better robustness when processing the stripes of complex shape.

关 键 词：结构光条纹 边界编码 CANNY算子 编解码 二叉树 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]