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Image watermarking has become an important tool for intellectual property protection and authentication. In this paper a watermarking technique is suggested that incorporates two watermarks in a host image for improved robustness. A watermark, in form of a PN sequence (will be called the information watermark), is embedded in the DCT domain of the cover image. The second watermark (called synchronization...
This paper deals with the image compression using fractional Fourier transform (FRFT), fractional cosine transform (FRCT), Fourier transform (FT) and cosine transform (CT). A comparison has been made between these techniques and observed that a good fidelity of decompressed image can be achieved at different fractional values of the transforms. The FRFT provides better mean square error (MSE) and...
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