Abstract:
An improved Discrete Wavelet Transform technique(IM-DWT) presented in this paper offers better imperceptibility, decreases execution time, and improves robustness in comparison to combined method Improved DWT/DCT (IMD-WC-T), Discrete Cosine Transform (DCT) and hybrid fusion technique (HFT) digital watermarking techniques. The proposed IM-DWT spread the watermark with PN-sequence with a certain key in a certain region coefficient of level 2 after decomposing the host image to generate the final watermarked image. Results obtained from IM-DWT technique showed improved performance in terms of imperceptibility, execution time and certain aspect in robustness such as Gama Correction and Histogram Equalization; than that of IMD-WC-T, DCT, and HFT, in addition to the quality of recovered watermark image as well. Comparing with HFT, the IM-DWT technique guarantees additional imperceptibility, reduced execution time and gave more robustness against Gama Correction and Histogram Equalization.
|