Wavelet based logo watermarking using repeating patterns

In this paper a wavelet-based logo watermarking scheme is presented. A binary logo is repeated in two dimensions and is used as a watermark. The watermark is embedded in the LLn sub-band of host image, using quantization technique. The repetitive patterns of watermark are used to repairing of extracted watermark from distorted watermarked image. Knowing the quantization step-size, dimensions of logo and the level of wavelet transform, the watermark is extracted, without any need to have access to the original image. Robustness of the proposed algorithm was tested against the following attacks: JPEG2000 and old JPEG compression, adding salt and pepper noise, median filtering, rotating, cropping and scaling. The promising experimental results are reported and discussed.