Image refining technique using digital watermarking

In this paper, an image refining technique is proposed. The digital waterma rking and RS coding techniques are adopted to provide the image refining. T he RS codewords' parities of original image are used as a watermark to be e mbedded in the original image. The watermark can provide the error correcti on and detection capability for the original image (refining function). Mea nwhile, we take the advantage of the parity bits of rearranged DCT coeffici ents in the lower frequency subbands of quantized DCT block to provide the robustness and imperceptibility requirement for watermarking technique. The proposed method can directly extract the embedded watermark from the water marked image without using original image so as to implement it to the real time system is feasible. The experimental results show that the error corr ection and detection capability, imperceptibility, and robustness of the wa termarking technique can be guaranteed.