A secure non-blind block based digital image watermarking technique using DWT and DCT

Digital image watermarking can be considered as a better solution to protect authentication of images and its copyright protection. The purpose of proposed method is to provide better security of host image. Proposed method is implemented using DWT and DCT. Watermark image is inserted in LL sub-band of host image by dividing it using DWT. 8×8 block DCT is applied on LL sub-band and watermark is embedded into last pixel of each block. On the basis of watermark pixel value, pixel value of host image is affected. Here, binary watermark image is taken for experiment. Extraction process is completely non-blind technique. In extraction DWT technique is applied on both host image and watermarked image. Finally reverse process of embedding is applied to extract exact watermark image.