Exposure preferences for digital still imaging: a psychophysical study

Jingqiang Li; Hau Hwang; Ruben Velarde; Kalin Atanassov; Xiaoyun Jiang; Ruby Hsiu

doi:10.1117/12.768438

12 March 2008 Exposure preferences for digital still imaging: a psychophysical study

Jingqiang Li, Hau Hwang, Ruben Velarde, Kalin Atanassov, Xiaoyun Jiang, Ruby Hsiu

Proceedings Volume 6817, Digital Photography IV; 68170U (2008) https://doi.org/10.1117/12.768438
Event: Electronic Imaging, 2008, San Jose, California, United States

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.

Citation Download Citation

Jingqiang Li, Hau Hwang, Ruben Velarde, Kalin Atanassov, Xiaoyun Jiang, and Ruby Hsiu "Exposure preferences for digital still imaging: a psychophysical study", Proc. SPIE 6817, Digital Photography IV, 68170U (12 March 2008); https://doi.org/10.1117/12.768438

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KEYWORDS

Cameras

Digital imaging

Image quality

Camera shutters

Control systems

Statistical modeling

Automatic control

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