Digital Image Watermarking Based on Sine Transformation with Constant Co-Efficient

In this paper, digital image watermarking technique using sine transformation with a constant co-efficient has been introduced in the frequency domain. During transmission, any noise or unwanted data accumulates with the least significant bit (LSB) of the original information. In the existing techniques, the secrete image will be compressed and added with the host, which forms invisible watermark. But the compressed data of the secrete image will be added to the LSB, which then altered by the unwanted information. In the proposed algorithm, the secrete image is first compressed using sine transformation with a constant co-efficient and then embedded into the host image with last but one bit from LSB. The resultant images obtained from the proposed algorithm are subjected for various security tests and the results are compared with the other existing algorithms. The results obtained are better compared to the existing techniques.