1-D Walsh Coding With DCT Block Watermarking Technique of Colour Images Using Y Channel

Abstract

In this paper a new blind technique using one dimensional Walsh coding to improve the robustness of image watermarking is presented. The proposed technique inserts the binary bits of handwritten signatures in the DCT blocks of the Y channel of the digital colour image. Watermarking algorith m wh ich uses 1-D Walsh coding to embed mobile phone digits in images captured by the phone camera is also introduced. The 1-D Walsh coding can be applied either horizontally or vertically. The results presented here were obtained for horizontal 1-D Walsh coding. These results prove that the use of Walsh coding has improved robustness against JPEG co mpression.