Comparison between the Cosine and Hartley Based Naturalness Preserving Transforms for Image Watermarking and Data Hiding

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Venue:
CRV '04 Proceedings of the 1st Canadian Conference on Computer and Robot Vision
Year:
2004

Citing 2
Cited 1

The Hartley transform

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A Wavelet-Based Image Watermarking Scheme

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Integrated Computer-Aided Engineering

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Abstract

A comparison between two image-watermarkingschemes is demonstrated in this paper. The proposedwatermarking techniques use modified forms of the naturalnesspreserving transform (NPT) to encode a watermark logo imageinto a host image. The modified NPT forms employ the Hartleyand cosine matrices, respectively, instead of the Hadamardmatrix used in the classical Hadamard based NPT. The modifiedNPT enhances the quality of the transformed image by reducingthe artifacts that occur in images transformed via the HadamardNPT. The proposed watermark has proven robust against varietyof image attacks including, image filtering, JPEG compression,cropping, and noise.