By Topic

A filter-switching auto-focus framework for consumer camera imaging systems

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Gamadia, M. ; Univ. of Texas at Dallas, Richardson, TX, USA ; Kehtarnavaz, N.

Auto-focus (AF) has become a standard feature in consumer level cameras. The most common AF approach analyzes a captured image with a digital band-pass filter applied to a focus region producing a focus value, which is then used by a search algorithm to locate the peak value position. The existing literature does not adequately address how to set the AF parameters such as the filter pass-band and the step-size magnitude. In this paper, a framework is presented to derive the AF parameters automatically based on camera specifications. Also, a new AF search algorithm named Filter-Switching Search is introduced which takes advantage of the derived AF parameters. The effectiveness is demonstrated via real-time implementation on three different camera platforms. Results indicate that the developed solution is portable across different platforms and outperforms the existing approaches without the need for extensive parameter tuning.

Published in:

Consumer Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 2 )