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Proceedings Paper

Real-time implementation of zoom tracking on TI DM processor
Author(s): Venkat R. Peddigari; Nasser Kehtarnavaz; Sang-Yong Lee; G. Cook
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Paper Abstract

Consumer demand for fast and accurate zoom tracking has increased in the Digital Still Camera (DSC) market. Consumers desire a DSC that automatically performs zoom tracking in order to maintain the image sharpness when the zoom lens is moved towards wide-angle or tele-angle directions. Zoom tracking involves the estimation of the in-focus motor position over all zooms based on a current in-focus position before the zoom lens is moved in either direction. Normally, a zoom tracking curve is utilized to automatically track the focus motor position when the zoom lens is moved. This paper discusses and compares the real-time implementation of two widely used zoom tracking algorithms, namely geometric zoom tracking (GZT) and adaptive zoom tracking (AZT), on the Texas Instruments (TI) digital media (DM) processor. This processor is a highly integrated, programmable dual-core processor manufactured by TI specifically for the DSC market. Our previously developed rule-based search algorithm is used to perform auto-focusing over the vicinity of the tracked focus motor position when the zoom lens is halted. This is done to regain any loss in accuracy during zoom tracking. Extensive testing was carried out to examine the performance of these algorithms in terms of tracking accuracy and speed. The results show that AZT generates a better tracking accuracy while GZT provides a faster tracking speed.

Paper Details

Date Published: 25 February 2005
PDF: 11 pages
Proc. SPIE 5671, Real-Time Imaging IX, (25 February 2005); doi: 10.1117/12.583354
Show Author Affiliations
Venkat R. Peddigari, Univ. of Texas/Dallas (United States)
Nasser Kehtarnavaz, Univ. of Texas/Dallas (United States)
Sang-Yong Lee, Texas Instruments, Inc. (United States)
G. Cook, Texas Instruments, Inc. (United States)

Published in SPIE Proceedings Vol. 5671:
Real-Time Imaging IX
Nasser Kehtarnavaz; Phillip A. Laplante, Editor(s)

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