DocumentCode :
2215757
Title :
Dual watermarking algorithm exploiting the logarithmic characteristic of the Human eye´s sensitivity to luminance
Author :
Zhe Wang ; Marshall, Stephen
Author_Institution :
Dept. of Electron. & Electr. Eng, Univ. of Strathclyde, Glasgow, UK
fYear :
2006
fDate :
4-8 Sept. 2006
Firstpage :
1
Lastpage :
5
Abstract :
The proposed colour image watermarking algorithm exploits the human visual system to optimise the trade off between the visibility and the robustness of the watermark. A less sensitive colour channel is selected to be watermarked and central watermarking is used to give the algorithm an extra robustness to image cropping. The DWT and DCT transforms are combined to pack the most energy into a few coefficients. The logarithmic sensitivity of the Human eye to luminance is exploited by assigning pixels into groups with different luminance ranges and watermarking them with different insertion powers. Test results show that the proposed algorithm has very good performance and is robust to several common image manipulations.
Keywords :
brightness; discrete cosine transforms; discrete wavelet transforms; eye; image colour analysis; image watermarking; sensitivity analysis; DCT transform; DWT transform; central watermarking; colour channel; colour image watermarking algorithm; discrete cosine transform; discrete wavelet transform; dual watermarking algorithm; human eye luminance sensitivity; human visual system; image cropping; image manipulation; insertion power; logarithmic characteristic; pixel assignment; Discrete cosine transforms; Image color analysis; Robustness; Signal processing algorithms; Vectors; Watermarking;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing Conference, 2006 14th European
Conference_Location :
Florence
ISSN :
2219-5491
Type :
conf
Filename :
7071223
Link To Document :
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