Roya ghasemkhani

In this paper a novel blind watermarking scheme in Hadamard transform domain for digital image is proposed. For embedding watermark bits we modify the DHT coefficient of two adjacent blocks in same position. Watermark is a string of characters. Hadamard transformation cause smaller image distortion during embedding compared to other transforms. Moreover, the using Hadamard transform offers advantages in terms of simpler implementation, low computation cost and high resiliency under compression. The experimental results and performance analysis shows very good robustness under JPEG image compression and other common image processing operations like cropping, rotation, noise addition and filtering.