DocumentCode :
3275673
Title :
Spread Transform Dither Modulation using a Perceptual Model
Author :
Li, Qiao ; Doerr, Gwenael ; Cox, Ingemar J.
Author_Institution :
Adastral Park Postgraduate Campus, Univ. Coll. London
fYear :
2006
fDate :
3-6 Oct. 2006
Firstpage :
98
Lastpage :
102
Abstract :
In previous work, we demonstrated how perceptual modeling can be applied to dither modulated quantization index modulation and rational dither modulation, to improve both robustness and fidelity. These algorithms were shown to be significantly more robust to valumetric scaling. However, they, and their predecessors, remain extremely sensitive to re-quantization which commonly occurs due to JPEG compression, numerical rounding and analog-to-digital conversion. It is well known that spread transform dither modulation (STDM) is more robust to re-quantization. In this paper we describe how to incorporate a perceptual model into this framework and present two algorithms based on Watson´s perceptual model. Experimental results of robustness to JPEG compression are reported for 1000 images at embedding rates of 1/32 and 1/320. At the high embedding rate, the robustness of the two algorithms is the same as STDM but the perceptual distortion is reduced 23 to about 4, based on Watson´s perceptual distance. At the lower embedding rate, we simultaneously observed superior robustness to STDM as well as improved fidelity. If the perceptual distance rather than the document-to-watermark ratio (DWR) is held fixed, then the two adaptive spread transform methods exhibit significant improvements in robustness to JPEG compression
Keywords :
data compression; image coding; visual perception; JPEG compression; STDM; Watson´s perceptual model; spread transform dither modulation; Bit error rate; Distortion measurement; Image coding; Quantization; Robustness; Signal processing; Signal processing algorithms; Spread spectrum communication; Transform coding; Watermarking;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Multimedia Signal Processing, 2006 IEEE 8th Workshop on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-9751-7
Electronic_ISBN :
0-7803-9752-5
Type :
conf
DOI :
10.1109/MMSP.2006.285276
Filename :
4064526
Link To Document :
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