基于多径衰落信道的结构光编码解码原理及其在复杂动态场景三维重建中的应用

项目名称： 基于多径衰落信道的结构光编码解码原理及其在复杂动态场景三维重建中的应用

项目编号： No.51205244

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 张旭

作者单位： 上海大学

项目金额： 25万元

中文摘要： 随着产业的升级和提升，全场三维运动、变形、振动等真实动态行为测量的要求在航空、航天、汽车、模具、机械零件等领域越来越迫切。然而，复杂动态场景具有位置时变性、光线调制的不规则性、空间分布的弱相关性、亮度投射的非线性，使结构光三维重建面临严峻挑战。本项目将结构光三维重建转化为信息传递问题，借鉴通信系统最新纠错码理论，结合结构光系统特性，提出多径衰落信道的结构光LDPC编码方法，建立自适应码字聚类识别规则，研究码字图的概率解码机制，在此基础上，构建结构光LDPC编、解码软件系统并进行应用研究。该项研究对揭示复杂动态场景下的信道衰落特性，建立接近Shannon极限的结构光信道编码和解码机制有重要意义，是对以信源唯一性为基础的结构光编码解码理论的完善和补充，有助于拓宽结构光技术的应用范围，促进相关应用行业的发展和进步。

中文关键词： 结构光三维测量；复杂因素；彩色编码结构光；解码；

英文摘要： Because of the industrial development and upgrading, the demand of measuring the dynamic behaviors, like motion, deformation, and vibration in 3D space, becomes increasingly urgent in the fields of aviation, aerospace, automotive, mould, mechanical parts, etc. However, complex dynamic scenes make the structured light for 3D reconstruction severely challenging, because there are time variation of the position, irregularity of light modulation, weak correlation in spatial distribution, nonlinearity of the projected light, etc. In this project, structured light for 3D reconstruction is modeled as the problem of information transmission. Inspired by the latest theory of error-correcting codes in the field of communication, and considered the characters of structured light system, low density parity check (LDPC) code in multipath fading channel of the structured light will be studied. Then, the clustering rule and algorithm would be developed to recognize the code, and the mechanism of code matching will be established in the form of graph model. After that, the software including structured light code strategy, decoding method for the correspondence, etc, would be developed. The method and the system would be adopted and further enhanced in some practical dynamic scenes, such as large-size thin-walled components wit

英文关键词： Structured light 3D measurement；Complex factors；Color coded structured light；Decoding；