Homomorphic Filter Based Image Watermarking

Piyanart Chotikawanid; Kharittha Thongkor; Thumrongrat Amornraksa

doi:10.4028/www.scientific.net/AMM.781.543

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 781Homomorphic Filter Based Image Watermarking

Homomorphic Filter Based Image Watermarking

Abstract:

This paper proposes a spatial domain image watermarking method based on homomorphic filter. In the proposed method, after applying the homomorphic filter to the host color image, a watermark image is embedded into the natural logarithm reflectance component of the image. Based on the concept that the reflectance component contains most of the image details with low energy, the watermark energy added to this component will be imperceptually noticed by the human eye. The embedding watermark is also protected by a key-based stream cipher, so that without the correct secret key, one cannot reconstruct the watermark. To identify the existence of the embedded watermark, the semi-blind detection approach is applied. The performance of the proposed method in terms of correlation coefficient between the original and extracted watermarks is measured and presented. Its robustness against image blurring and image sharpening at various strengths is also evaluated. The results show the potential of the proposed method for a practical system.

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Periodical:

Applied Mechanics and Materials (Volume 781)

Pages:

543-546

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.781.543

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Online since:

August 2015

Authors:

Piyanart Chotikawanid*, Kharittha Thongkor, Thumrongrat Amornraksa

Keywords:

Digital Image Watermarking, Homomorphic Filter, Reflectance Component

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