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首页> 外文会议>Conference on emerging digital micromirror device based systems and applications; 20090128; San Jose, CA(US) >Optical Calibration of a Digital Micromirror Device (DMD)-based Compressive Imaging (CI) System
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Optical Calibration of a Digital Micromirror Device (DMD)-based Compressive Imaging (CI) System

机译：基于数字微镜设备（DMD）的压缩成像（CI）系统的光学校准

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Compressive imaging (CI) system is a novel electro-optical imaging system design, which uses a single-pixel photo detector to capture two dimensional (2D) images. Instead of sampling the image directly by the sensor following the classic Nyquist-Shannon sampling theorem, CI systems insert a measurement layer between the image formation and the image recording media so that projection measurement matrices used to conduct compressive sampling can be effectively introduced to the imaging process. The Digital Micromirror Device (DMD) can be used to implement the projection measurement matrices. The imaging performance of a DMD based CI system relies more than just on the imaging optics and the pixel size of the sensor. It also depends on the design of the measurement matrices and their physical representations by the DMD. In the present work, we implemented three compressive sampling methods with the DMD, namely the random basis under-sampling method, the random sampling method in the Hadamard space and the variable density sampling method in the Hadamard space. We experimentally demonstrated that the design and implementation of these methods have a direct impact on the imaging performance of the CI system. We tested the system with different sampling ratios, DMD mirror configurations and imaging optics. Their influences on the reconstructed image quality are demonstrated by experimental results. Lastly, we discussed the illumination issue of the reconstructed image, which is not related to resolution, but is important for our visual perception of the reconstructed image.
机译：压缩成像（CI）系统是一种新颖的电光成像系统设计，它使用单像素光电检测器来捕获二维（2D）图像。 CI系统无需遵循经典的Nyquist-Shannon采样定理直接由传感器采样图像，而是在图像形成和图像记录介质之间插入测量层，从而可以将用于进行压缩采样的投影测量矩阵有效地引入到成像中处理。数字微镜设备（DMD）可用于实现投影测量矩阵。基于DMD的CI系统的成像性能不仅仅取决于成像光学器件和传感器的像素大小。它还取决于测量矩阵的设计及其DMD的物理表示。在当前工作中，我们使用DMD实现了三种压缩采样方法，即随机基础欠采样方法，Hadamard空间中的随机采样方法和Hadamard空间中的可变密度采样方法。我们通过实验证明，这些方法的设计和实现对CI系统的成像性能具有直接影响。我们使用不同的采样率，DMD镜配置和成像光学器件对系统进行了测试。实验结果证明了它们对重建图像质量的影响。最后，我们讨论了重建图像的照明问题，该问题与分辨率无关，但是对于我们视觉感知重建图像很重要。

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