A New Digital Watermarking Algorithm Based on DWT-DCT-RLC
The paper presents an imperceptible and robust digital watermarking algorithm using a combination of the DWT-DCT , which improves the robustness via using new embedding strategy. Apply 4-level DWT to the host image. Then, DCT transform of each directional middle frequencies DWT subband is computed; A binary watermarked logo is coded by Run-Length Code(RLC);The watermark bits are embedded in the coefficients of the DCT block based on the energy of each corresponding to coefficient in the highest level selected using the value of RLC. Performance evaluation show that the proposed scheme is invisible and robust against common image manipulations like JPEG compression, noise adding, sharpening, filtering.
Elwin Mao and Linli Xu
W. J. He et al., "A New Digital Watermarking Algorithm Based on DWT-DCT-RLC", Advanced Engineering Forum, Vol. 1, pp. 188-192, 2011