28 January 2009 Enhancement of dynamic range of FPA detector by using digital micro-mirror device
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Abstract
Based on a DMD spatial light modulator, a scheme for enhancement of the dynamic range of FPA detector is put forward. High dynamic range images are captured through local multiple exposures to a high contrast scene. When such a scene is taken with conventional cameras, it is hard to obtain a satisfying picture since the high and low luminance areas are respectively over and under exposed. A direct method to solve the problem is to use a FPA detector with high dynamic range. Such kinds of FPA detector are rising up but still expensive now. An alternative is to acquire multi images of same scene with different exposure times and to fuse them through processing program. It is unsuitable for the case where there are moving targets in scenes. Even for a static scene, it can take long time to obtain an image with high quality. The method suggested in this paper has the advantage that a high dynamic range image can be obtained through a single exposure. According to the image acquired by pre-exposure to the scene, many segments and their corresponding exposure times are determined. And through control of the switch time of micro-mirrors in the DMD, a high dynamic range image with high image quality can be acquired by single integration of FPA as a CCD or CMOS sensor.
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Wang Zhou, Wang Zhou, Weimin Shen, Weimin Shen, "Enhancement of dynamic range of FPA detector by using digital micro-mirror device", Proc. SPIE 7156, 2008 International Conference on Optical Instruments and Technology: Optical Systems and Optoelectronic Instruments, 71562X (28 January 2009); doi: 10.1117/12.811502; https://doi.org/10.1117/12.811502
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