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Proceedings Paper

Full-color visibility model using CSF which varies spatially with local luminance
Author(s): Alastair Reed; David Berfanger; Yang Bai; Kristyn Falkenstern
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Paper Abstract

A full color visibility model has been developed that uses separate contrast sensitivity functions (CSFs) for contrast variations in luminance and chrominance (red-green and blue-yellow) channels. The width of the CSF in each channel is varied spatially depending on the luminance of the local image content. The CSF is adjusted so that more blurring occurs as the luminance of the local region decreases. The difference between the contrast of the blurred original and marked image is measured using a color difference metric. This spatially varying CSF performed better than a fixed CSF in the visibility model, approximating subjective measurements of a set of test color patches ranked by human observers for watermark visibility. The effect of using the CIEDE2000 color difference metric compared to CIEDE1976 (i.e., a Euclidean distance in CIELAB) was also compared.

Paper Details

Date Published: 3 March 2014
PDF: 12 pages
Proc. SPIE 9027, Imaging and Multimedia Analytics in a Web and Mobile World 2014, 902705 (3 March 2014); doi: 10.1117/12.2045408
Show Author Affiliations
Alastair Reed, Digimarc Corp. (United States)
David Berfanger, Hewlett-Packard Co. (United States)
Yang Bai, Digimarc Corp. (United States)
Kristyn Falkenstern, Digimarc Corp. (United States)

Published in SPIE Proceedings Vol. 9027:
Imaging and Multimedia Analytics in a Web and Mobile World 2014
Qian Lin; Jan Philip Allebach; Zhigang Fan, Editor(s)

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