Share Email Print
cover

Proceedings Paper

Use of web cameras for watermark detection
Author(s): John Stach; Trenton J. Brundage; Brett T. Hannigan; Brett A. Bradley; Tony Kirk; Hugh Brunk
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Many articles covering novel techniques, theoretical studies, attacks, and analyses have been published recently in the field of digital watermarking. In the interest of expanding commercial markets and applications of watermarking, this paper is part of a series of papers from Digimarc on practical issues associated with commercial watermarking applications. In this paper we address several practical issues associated with the use of web cameras for watermark detection. In addition to the obvious issues of resolution and sensitivity, we explore issues related to the tradeoff between gain and integration time to improve sensitivity, and the effects of fixed pattern noise, time variant noise, and lens and Bayer pattern distortions. Furthermore, the ability to control (or at least determine) camera characteristics including white balance, interpolation, and gain have proven to be critical to successful application of watermark readers based on web cameras. These issues and tradeoffs are examined with respect to typical spatial-domain and transform-domain watermarking approaches.

Paper Details

Date Published: 29 April 2002
PDF: 10 pages
Proc. SPIE 4675, Security and Watermarking of Multimedia Contents IV, (29 April 2002); doi: 10.1117/12.465321
Show Author Affiliations
John Stach, Digimarc Corp. (United States)
Trenton J. Brundage, Digimarc Corp. (United States)
Brett T. Hannigan, Digimarc Corp. (United States)
Brett A. Bradley, Digimarc Corp. (United States)
Tony Kirk, Digimarc Corp. (United States)
Hugh Brunk, Digimarc Corp. (United States)


Published in SPIE Proceedings Vol. 4675:
Security and Watermarking of Multimedia Contents IV
Edward J. Delp; Ping Wah Wong, Editor(s)

© SPIE. Terms of Use
Back to Top