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25 August 1998 Realizing digital filters with an incoherent correlator
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In this paper a novel method of realizing digital filters in an incoherent correlator is proposed. A gray-scale complementary encoding method is used to express the positive and negative numbers simultaneously so that the digital filtering will be simplified into a convolution of the encoding images and corresponding filter mask followed by a subtraction operation, which is easily done by optical method or computer. Based on the new method a compact incoherent optical digital filtering unit (IODFU) is built up. In the IODFU a SHARP QA-1200 8.4 inch active matrix TFT liquid crystal display panel is used for displaying the gray-scale images to be analyzed and the filter masks at the same time. The images and filters can be changed by computer-controlling for different destinations. The IODFU is very compact and the processing speed can get to 12 frames per second. At the end of this paper the experimental results are given.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gang Cheng, Guofan Jin, Minxian Wu, Haisong Liu, Qingsheng He, and ShiFu Yuan "Realizing digital filters with an incoherent correlator", Proc. SPIE 3388, Advances in Optical Information Processing VIII, (25 August 1998);

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