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Proceedings Paper

Digital implementation of nonuniformity correction for IRFPAs
Author(s): Zhiguo Cao; Nong Sang; Wei Li; Yuehuan Wang; Guoyou Wang; Tianxu Zhang
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Paper Abstract

All IRFPAs require nonuniformity correction. Although two- point or multi-point correction algorithms may correct the nonuniformity of IRFPAs they can be limited by pixel nonlinearities and instabilities. So adaptive nonuniformity correction techniques are needed. Many researchers develop the methods of real-time correction based the scene being viewed. The nonuniformity correction process is completed in IRFPA sensor named smart FPA. However, the smart IRFPA is developing. The purpose of this paper is to describe a digital signal processing electronics for the nonuniformity correction. It includes ADSP21060 digital signal processor, 8751 chip and display circuit module. The image data from IRFPA are put into the dual RAM. The ADSP21060 DSP completes the nonuniformity correction function while the 8751 chip operates control function. At the same time, the correction results will be displayed on a monitor. The neural networks algorithms and the constant-statistics algorithm are tested in our digital implementations. When the image size is 60*97, processing time per frame is 14.75 millisecond for the neural network algorithm and it is 12.65 millisecond for the constant-statistics algorithm. Measured results show that digital processing system designed by us may achieve demand of real-time nonuniformity correction based the scene for small IRFPAs.

Paper Details

Date Published: 26 July 1999
PDF: 8 pages
Proc. SPIE 3698, Infrared Technology and Applications XXV, (26 July 1999); doi: 10.1117/12.354584
Show Author Affiliations
Zhiguo Cao, Huazhong Univ. of Science and Technology (China)
Nong Sang, Huazhong Univ. of Science and Technology (China)
Wei Li, Huazhong Univ. of Science and Technology (China)
Yuehuan Wang, Huazhong Univ. of Science and Technology (China)
Guoyou Wang, Huazhong Univ. of Science and Technology (China)
Tianxu Zhang, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 3698:
Infrared Technology and Applications XXV
Bjorn F. Andresen; Marija Strojnik, Editor(s)

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