The Effect of Exposure on MaxRGB Color Constancy

Resource type
Date created
2010-02
Authors/Contributors
Author: Funt, Brian
Author: Shi, Lilong
Abstract
The performance of the MaxRGB illumination-estimation method for color constancy and automatic white balancing has been reported in the literature as being mediocre at best; however, MaxRGB has usually been tested on images of only 8-bits per channel. The question arises as to whether the method itself is inadequate, or rather whether it has simply been tested on data of inadequate dynamic range. To address this question, a database of sets of exposure-bracketed images was created. The image sets include exposures ranging from very underexposed to slightly overexposed. The color of the scene illumination was determined by taking an extra image of the scene containing 4 Gretag Macbeth mini Colorcheckers placed at an angle to one another. MaxRGB was then run on the images of increasing exposure. The results clearly show that its performance drops dramatically when the 14-bit exposure range of the Nikon D700 camera is exceeded, thereby resulting in clipping of high values. For those images exposed such that no clipping occurs, the median error in MaxRGB’s estimate of the color of the scene illumination is found to be relatively small.
Document
Description
Presented at IS&T/SPIE Electronic Imaging, San Jose, February 2010.
Published as
Brian Funt, Lilong Shi, "The effect of exposure on MaxRGB color constancy," Proc. SPIE 7527, Human Vision and Electronic Imaging XV, 75270Y (17 February 2010); https://doi.org/10.1117/12.845394
Publication title
Proc. SPIE 7527, Human Vision and Electronic Imaging XV
Document title
The Effect of Exposure on MaxRGB Color Constancy
Date
2010
Copyright statement
Copyright is held by the author(s).
Scholarly level
Peer reviewed?
Yes
Language
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