A Real-time Continuous Automatic Focus Algorithm for Digital Cameras

Author

Gamadia, M. ; Kehtarnavaz, N.

Author_Institution

Dept. of Electr. Eng., Univ. of Texas, Richardson, TX

fYear

0

fDate

0-0 0

Firstpage

163

Lastpage

167

Abstract

Most conventional continuous auto-focus algorithms appearing in the literature fail to address how to focus on a desired near object when there are multiple objects in the scene, especially in the presence of a high contrast background. The stability and responsiveness of these methods also hinge on hard-to-set thresholds. In this paper, a multiple-window, rule-based, continuous auto-focus method is presented which is capable of focusing on a desired object and deploys easy-to-set thresholds which control stability and responsiveness. This method has been implemented for real-time use on the Texas Instruments Digital Camera Development System powered by the DM320 media processor. Experimental results show that the method provides stable and responsive focusing suitable for both live preview and movie modes of digital still/video cameras

Keywords

cameras; image processing; optical self-focusing; DM320 media processor; Texas Instruments Digital Camera Development System; digital still camera; digital video camera; easy-to-set thresholds; hard-to-set thresholds; high contrast background; multiple-window rule-based continuous auto-focus method; real-time continuous automatic focus algorithm; stability control; Band pass filters; Delay; Digital cameras; Focusing; Frequency; Image sensors; Instruments; Layout; Position measurement; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Image Analysis and Interpretation, 2006 IEEE Southwest Symposium on

Conference_Location

Denver, CO

Print_ISBN

1-4244-0069-4

Type

conf

DOI

10.1109/SSIAI.2006.1633743

Filename

1633743