DocumentCode :
2972955
Title :
Effect of cover quantization on steganographic fisher information
Author :
Fridrich, Jessica
Author_Institution :
Dept. of ECE, SUNY Binghamton, Binghamton, NY, USA
fYear :
2012
fDate :
2-5 Dec. 2012
Firstpage :
163
Lastpage :
168
Abstract :
This article presents an extension of the square root law of imperfect steganography to consider the effects of quantization on the steganographic Fisher information. We make the assumption that the cover elements are quantized i.i.d. samples drawn from an underlying continuous-valued `precover´ distribution. In the fine quantization limit, the Fisher information exhibits power scaling with an exponent determined jointly by the smoothness of the precover distribution and the properties of the embedding function. This extension is relevant for understanding the effects of pixel color depth and JPEG quality factor on secure payload of imperfect steganography realized using a mutually independent embedding operation.
Keywords :
data compression; image coding; image colour analysis; quantisation (signal); steganography; JPEG quality factor; continuous-valued precover distribution; cover quantization; embedding function; imperfect steganography; pixel color depth; square root law; steganographic Fisher information; Detectors; Media; Q factor; Quantization; Robustness; Security; Transform coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Forensics and Security (WIFS), 2012 IEEE International Workshop on
Conference_Location :
Tenerife
Print_ISBN :
978-1-4673-2285-0
Electronic_ISBN :
978-1-4673-2286-7
Type :
conf
DOI :
10.1109/WIFS.2012.6412643
Filename :
6412643
Link To Document :
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