30 May 1995 Digital image processing for thermal observation system
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Proceedings Volume 2513, 21st International Congress on: High-Speed Photography and Photonics; (1995) https://doi.org/10.1117/12.209655
Event: High-Speed Photography and Photonics: 21st International Congress, 1994, Taejon, Korea, Republic of
Abstract
This paper describes the digital image processing techniques of a thermal observation system, which is a serial/parallel scan and standard TV display type using a SPRITE (Signal PRocessing In The Element) detector. The designed digital electronics has two major signal processing stages: a high speed digital scan converter and an autoregressive (AR) filter. The digital scan converter is designed with analog-to-digital converter (ADC) and dual port RAM that can carry out reading and writing simultaneously, thus enabling compact scan conversion. The scan converter reformats the five parallel analog signals generated from the detector elements into serial digital signals compatible with RS-170 video rate. For the improvement of signal-to- noise ratio and compensation for the gamma effect of the monitor, we have implemented a real time 1st order AR filter that adopts frame averaging method. With the look-up-table (LUT) ROM that contains the frame averaging factors and the gamma coefficients, this digital filter performs the noise reduction and the gamma correction at the same time. This digital image processor has been proven to provide excellent image quality and superior detection capability for distant targets at night time.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wee Kyung Yu, In Seob Song, Eon Suk Yoon, Y. S. Lee, M. G. Moon, Seok-Min Hong, J. K. Kim, "Digital image processing for thermal observation system", Proc. SPIE 2513, 21st International Congress on: High-Speed Photography and Photonics, (30 May 1995); doi: 10.1117/12.209655; https://doi.org/10.1117/12.209655
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