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Journal of Electronic Imaging

Improved method of finding the illuminant direction of a sphere
Author(s): Richard Dosselmann; Xue Dong Yang
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Paper Abstract

An improved means of finding the direction of a light source illuminating a sphere is presented. In particular, the vertical slant angle of a light source is computed using a new approach. The planar tilt angle of a source is known to be related to the average of the local gradient vectors of an image of a lit sphere. This research uncovers a straightforward link between the length of the average of the local normalized gradient vectors of an image and the slant angle of the corresponding light source. The new technique is far more effective when compared with existing approaches over a variety of test images.

Paper Details

Date Published: 27 March 2013
PDF: 8 pages
J. Electron. Imaging. 22(1) 013035 doi: 10.1117/1.JEI.22.1.013035
Published in: Journal of Electronic Imaging Volume 22, Issue 1
Show Author Affiliations
Richard Dosselmann, Univ. of Regina (Canada)
Xue Dong Yang, Univ. of Regina (Canada)

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