Title :
An analysis of quantization influence on optimal detection of multiplicative watermark
Author :
Orovic, Irena ; Zaric, Nikola ; Stankovic, Stevan
Author_Institution :
Fac. of Electr. Eng., Univ. of Montenegro, Podgorica, Montenegro
Abstract :
Analysis of quantization effects on watermarked coefficients and watermark is considered. A criterion for selection of coefficients suitable for watermarking in the presence of quantization is derived. The effects of quantization are further analyzed in terms of the probability of detectable watermark and the probability of zero-quantized watermarked coefficients. This analysis is used to define an image watermarking procedure that provides robustness to an arbitrary JPEG compression/quantization degree. Theoretical results are illustrated by examples.
Keywords :
discrete cosine transforms; image watermarking; quantisation (signal); JPEG compression; image watermarking procedure; multiplicative watermark; optimal detection; quantization influence; watermarked coefficients; Detectors; Discrete cosine transforms; Probability density function; Quantization (signal); Robustness; Standards; Watermarking; Image watermarking; JPEG compression; Optimal detection;
Conference_Titel :
ELMAR, 2013 55th International Symposium
Conference_Location :
Zadar
Print_ISBN :
978-953-7044-14-5
