Automatic exposure and white balance control in video cameras: Time course characterization and preference

Author

Nuutinen, Mikko ; Valkonen, Valtteri ; Oittinen, Pirkko ; Virtanen, Tuomas

Author_Institution

Sch. of Sci., Dept. of Media Technol., Aalto Univ., Espoo, Finland

fYear

2013

fDate

4-6 Sept. 2013

Firstpage

25

Lastpage

29

Abstract

On a coarse level the lightness and chromatic adaptation of the human visual system (HVS) and signal processing in a video camera are comparable processes. Both adapt to changes in lighting environment and are time dependent. This study developed metrics for characterizing time-course of automatic exposure (AE) and white balance (AWB) controls in video cameras. To evaluate subjective preference for AE and AWB videos, specific scenes with natural lighting changes were designed. Our results show that the subjective preference AE time course is fast and without overshoot. In addition preference speed for the time-course of AWB was about six seconds for videos used in this study.

Keywords

image colour analysis; video cameras; video signal processing; visual perception; AE time course; HVS; automatic exposure controls; automatic white balance controls; human visual system; natural lighting; signal processing; time course characterization; time course preference; video cameras; Cameras; Image color analysis; Kelvin; Lighting; Observers; Steady-state; Automatic exposure; Automatic white balance; Color imaging; Digital video; Image quality;

fLanguage

English

Publisher

ieee

Conference_Titel

Image and Signal Processing and Analysis (ISPA), 2013 8th International Symposium on

Conference_Location

Trieste

Type

conf

DOI

10.1109/ISPA.2013.6703709

Filename

6703709