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Proceedings Paper

Real-time implementation of autofocus on the TI DSC processor
Author(s): Mark Gamadia; Venkat Peddigari; Nasser Kehtarnavaz; Sang-Yong Lee; Gorden Cook
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Paper Abstract

This paper discusses the real-time implementation of a fast and accurate auto-focus method on the Texas Instruments DM270, a programmable processor designed specifically for digital still cameras. The DM270's programmable auto-focus hardware filter is utilized to obtain a sharpness function from a captured image. This function is then used to drive a rule-based search algorithm, which varies the focusing step size depending on the slope of the sharpness function. This leads to faster focusing speeds as compared to the standard global search algorithm. A wide variety of filters are tested by examining their performances in terms of focusing accuracy. The results show that the filters approximating the first derivative operator generate the best focusing accuracy under various focusing conditions.

Paper Details

Date Published: 18 May 2004
PDF: 9 pages
Proc. SPIE 5297, Real-Time Imaging VIII, (18 May 2004); doi: 10.1117/12.519600
Show Author Affiliations
Mark Gamadia, Univ. of Texas at Dallas (United States)
Venkat Peddigari, Univ. of Texas at Dallas (United States)
Nasser Kehtarnavaz, Univ. of Texas at Dallas (United States)
Sang-Yong Lee, Texas Instruments Inc. (United States)
Gorden Cook, Texas Instruments Inc. (United States)

Published in SPIE Proceedings Vol. 5297:
Real-Time Imaging VIII
Nasser Kehtarnavaz; Phillip A. Laplante, Editor(s)

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