In this paper a novel method of realizing digital filters in an incoherent correlator is proposed in a shortly way. A novel gray-scale complementary encoding method is used to express the positive and negative numbers simultaneously. Digital filtering will be simplified into a convolution of the encoding images and filters followed by a subtraction operation. Based on the new method an Incoherent Optical Digital Filtering Unit (IODFU) is constituted. In the IODFU a liquid crystal spatial light modulator is used for displaying the gray-scale images to analyzed and the digital filters at the same time. All 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 optical experiments are given.

Date Published: 1 April 1998
PDF: 8 pages
Proc. SPIE 3297, Liquid Crystal Materials, Devices, and Applications VI, (1 April 1998); doi: 10.1117/12.304539

Published in SPIE Proceedings Vol. 3297:
Liquid Crystal Materials, Devices, and Applications VI
Ranganathan Shashidhar, Editor(s)