Accurate pixel-to-pixel correspondence adjustment in a digital micromirror device camera by using the phase-shifting moiré method.
Accurate pixel-to-pixel correspondence adjustment in a digital micromirror device camera by using the phase-shifting moiré method.
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DOI：
10.1364/ao.45.006940
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发表时间：
2006-09
期刊：
影响因子：
1.9
通讯作者：
S. Ri;M. Fujigaki;T. Matui;Y. Morimoto
中科院分区：
文献类型：
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作者：
S. Ri;M. Fujigaki;T. Matui;Y. Morimoto
先前已经开发了基于数字图像处理设备（DMD）技术的照相机。在该光学系统中，由于DMD和CCD的像素尺寸非常小，所以不能容易地实现DMD的每个反射镜与CCD的每个像素的对应。提出了一种利用相移云纹法实现DMD相机像元对应关系的精确调整方法。为了进行光学系统的高精度调整，当CCD像素和DMD反射镜彼此失配和/或未对准时，分析莫尔条纹图案的相位分布。这种技术不需要复杂的设置或复杂的图像处理来生成莫尔条纹图案，并且它只需要一个捕获的图像。在调整实验中，该方法提供了非常准确的调整，其误差小于1/25像素。进行了相分析实验，以证明其有效性。
A camera based on the digital micromirror device (DMD) technology has been previously developed. In this optical system, the correspondence of each mirror of the DMD to each pixel of the CCD cannot readily be done since the pixel sizes of the DMD and the CCD are very small. An accurate pixel-to-pixel correspondence adjustment in the DMD camera by means of the phase-shifting moiré method is proposed. To perform high accurate adjustment of the optical system, the phase distribution of a moiré fringe pattern is analyzed when the CCD pixels and the DMD mirrors have a mismatch and/or misalignment with each other. This technique does not need a complicated setting or complex image processing to generate the moiré fringe pattern, and it needs only one captured image. In the adjustment experiment, the proposed method provided very accurate adjustment whose error was less than 1/25 pixel. An experiment of phase analysis to demonstrate the usefulness was performed.