中国物理学会期刊网
物理学报  2017, Vol.66 Issue (23): 234201  DOI:10.7498/aps.66.234201
基于数字微镜器件的自适应高动态范围成像方法及应用
天津大学, 精密测试技术及仪器国家重点实验室, 天津 300072
Adaptive high-dynamic-range imaging method and its application based on digital micromirror device
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China

摘要

在结构光三维扫描测量中,强反射表面因编码结构光照射后易产生局部镜面反射的特性,引起相机曝光饱和,淹没了所要检测的表面几何特征信息.为解决强反射表面的视觉成像难题,基于数字微镜器件(digital micromirror device,DMD)具有调制入射光线空间信息的特性,本文提出一种基于DMD的自适应高动态范围成像方法.设计与搭建了一套新型可编程的计算成像系统,建立其光学系统模型,并实现了DMD微镜与CMOS像素的匹配与映射;分析了基于逐像素编码曝光的高动态范围成像原理,并设计了基于DMD的光强编码控制算法,实现对入射光线强度的自适应精确调制,从而使进入成像系统中的入射光强始终处于相机的合适曝光强度内.实验表明:该方法突破了普通数字相机的动态范围限制,能够精确地控制被测强反射表面各个区域的入射光线强弱,并实现了对强反射表面的局部过曝光区域的清晰成像.该研究成果将为从根源上解决强反射表面因局部过曝光造成的三维点云缺失问题提供重要的解决方案.

Abstract

In the three-dimensional (3D) scanning measurement based on structured light techniques, the strong reflection surface is easy to produce local specular reflection due to the illumination of the structured light, which will cause the camera to be over-exposed, and therefore the geometry information of strong reflection surface cannot be detected. Since the digital micromirror device (DMD) has the modulating characteristics of the spatial information of incident light, an adaptive high-dynamic-range imaging method based on DMD is proposed to solve the problem of visual imaging of strong reflection surface. Firstly, a novel and computational imaging system is designed and built, and its optical model is also established. Then, the matching and mapping methods between DMD micromirrors and CMOS pixels are described in detail and realized. Meanwhile, we analyze the theory of the high-dynamic-range imaging based on per-pixel coded exposure, and design a coding control algorithm of light intensity to achieve the adaptive precision modulation of the intensity of incident light, so that the incident light in the imaging system is always in appropriate exposure intensity. The experiments show that the method can break through the limited dynamic range of the ordinary digital camera, and accurately control the intensity of incident light in each region of the measured strong reflection surfaces, and thus it can obtain the high-quality images of the local over-exposure area of the strong reflection surface. More importantly, the research will provide a new solution to the problem of 3D point cloud loss caused by local over-exposure of the strong reflection surface.
收稿日期:2017-01-01

基金资助

国家自然科学基金(批准号:51775379,51675380)资助的课题.
Project supported by the National Natural Science Foundation of China (Grant Nos. 51775379, 51675380).

引用本文

[中文]
冯维, 张福民, 王惟婧, 曲兴华. 基于数字微镜器件的自适应高动态范围成像方法及应用[J]. 物理学报, 2017, 66(23): 234201.
[英文]
Feng Wei, Zhang Fu-Min, Wang Wei-Jing, Qu Xing-Hua. Adaptive high-dynamic-range imaging method and its application based on digital micromirror device[J]. Acta Phys. Sin., 2017, 66(23): 234201.
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