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Dr. Sybrand Spannenburg
Director at Joh Enschedé
SPIE Involvement:
Author
Publications (4)
Proceedings Article | 7 April 2000 Paper
Developments in digital document security
Proceedings Volume 3973, (2000) https://doi.org/10.1117/12.382178
KEYWORDS: Information security, Printing, Image compression, Computer programming, Computer security, Image processing, Biometrics, Security printing, Digital imaging, Linear filtering
Proceedings Article | 7 February 1997 Paper
Machine-detectable copying security elements
Proceedings Volume 2949, (1997) https://doi.org/10.1117/12.266327
KEYWORDS: Information security, Modulation, Visualization, Image compression, Security printing, Angle modulation, Printing, Halftones, Spatial frequencies, Scanners
Proceedings Article | 15 March 1996 Paper
Optically and machine-detectable copying security elements
Proceedings Volume 2659, (1996) https://doi.org/10.1117/12.235447
KEYWORDS: Information security, Image compression, Fourier transforms, Image filtering, Visualization, Security printing, Angle modulation, Modulation, Printing, Image processing
Proceedings Article | 1 October 1991 Paper
Frequency modulation of printed gratings as a protection against copying
Proceedings Volume 1509, (1991) https://doi.org/10.1117/12.47113
KEYWORDS: Modulation, Holography, Frequency modulation, Scanners, Photography, Information security, Binary data, Visualization, Digital holography, Contrast sensitivity
Conference Committee Involvement (2)
Optical Security and Counterfeit Deterrence Techniques VI
18 January 2006 | San Jose, California, United States
Optical Security and Counterfeit Deterrence Techniques V
20 January 2004 | San Jose, California, United States
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