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Using image entropy maximum for auto exposure

[+] Author Affiliations
Mohammad T. Rahman

University of Texas at Dallas, Electrical Engineering, 800 West Campbell Road, Richardson, Texas 75080

Nasser Kehtarnavaz

University of Texas at Dallas, Electrical Engineering, 800 West Campbell Road, Richardson, Texas 75080

Qolamreza R. Razlighi

University of Texas at Dallas, Electrical Engineering, 800 West Campbell Road, Richardson, Texas 75080

J. Electron. Imaging. 20(1), 013007 (February 08, 2011). doi:10.1117/1.3534855
History: Received February 22, 2010; Revised October 27, 2010; Accepted December 13, 2010; Published February 08, 2011; Online February 08, 2011
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To achieve auto exposure in digital cameras, image brightness is widely used because of its direct relationship with exposure value. To use image entropy as an alternative statistic to image brightness, it is required to establish how image entropy changes as exposure value is varied. This paper presents a mathematical proof along with experimental verification results to show that image entropy reaches a maximum value as exposure value is varied by changing shutter speed or aperture size.

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© 2011 SPIE and IS&T

Citation

Mohammad T. Rahman ; Nasser Kehtarnavaz and Qolamreza R. Razlighi
"Using image entropy maximum for auto exposure", J. Electron. Imaging. 20(1), 013007 (February 08, 2011). ; http://dx.doi.org/10.1117/1.3534855


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