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Proceedings Paper

A kind of FPGA-based correlating Shack-Hartmann wave-front processor
Author(s): Xiaofeng Peng; Mei Li; Changhui Rao
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Paper Abstract

In solar adaptive optical system, absolute difference algorithm and correlation coefficients algorithm are widely used in Shack-Hartmann wave-front detection of the extended object. A Shack-Hartmann wave-front processor based on absolute difference algorithm is described in this paper. It is characterized by parallel and systolic architecture. The peak operation speed is over 23,000,000,000/s and calculation latency is 120us in a system with 6x6 sub-aperture array, which is 32x32 pixel in size each and for which the reference image is 16x16 pixel. Using this processor, frame rate of the CCD (Charge Coupled Device) can be up to 1000 Hz, and with smaller sub-aperture size, the frame rate can be even higher. Built in a single FPGA (Field Programmable Gate Array), it is low-cost, compact and easy to be modified.

Paper Details

Date Published: 31 December 2008
PDF: 6 pages
Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 71303Z (31 December 2008); doi: 10.1117/12.819702
Show Author Affiliations
Xiaofeng Peng, Institute of Optics and Electronics (China)
Graduate School of the Chinese Academy of Sciences (China)
Mei Li, Institute of Optics and Electronics (China)
Changhui Rao, Institute of Optics and Electronics (China)

Published in SPIE Proceedings Vol. 7130:
Fourth International Symposium on Precision Mechanical Measurements
Yetai Fei; Kuang-Chao Fan; Rongsheng Lu, Editor(s)

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