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Proceedings Paper

Exposure preferences for digital still imaging: a psychophysical study
Author(s): Jingqiang Li; Hau Hwang; Ruben Velarde; Kalin Atanassov; Xiaoyun Jiang; Ruby Hsiu
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Paper Abstract

The automatic exposure control (AEC) for a camera phone is typically a simple function of the brightness of the image. This brightness, or intensity, value generated from a frame is compared to a predefined target. If the intensity value is less than a specified target, the exposure is increased. If the value is greater, exposure will be decreased. Is using an intensity target statistic a good model for AEC? In order to answer this question, we conducted psychophysical experiments to understand subjective preferences. We used a high-end DSLR to take 64 different outdoor and indoor scenes. Each scene was captured using five different exposure values (EV), from EV-1 to EV+1 with half EV increments. Subjects were shown the five exposures for each scene and asked to rank them based on their preferences. The collected data were analyzed along different dimensions: preferences as a function of the subjects, EV levels, image quality scores, and the images themselves. Our data analysis concludes that a dynamic intensity target is needed to match the exposure preferences collected from our subjects.

Paper Details

Date Published: 12 March 2008
PDF: 8 pages
Proc. SPIE 6817, Digital Photography IV, 68170U (12 March 2008); doi: 10.1117/12.768438
Show Author Affiliations
Jingqiang Li, Qualcomm Inc. (United States)
Hau Hwang, Qualcomm Inc. (United States)
Ruben Velarde, Qualcomm Inc. (United States)
Kalin Atanassov, Qualcomm Inc. (United States)
Xiaoyun Jiang, Qualcomm Inc. (United States)
Ruby Hsiu, Qualcomm Inc. (United States)

Published in SPIE Proceedings Vol. 6817:
Digital Photography IV
Jeffrey M. DiCarlo; Brian G. Rodricks, Editor(s)

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