Development of Robust Alpha Blending based Digital Watermarking Technique for Images based on DWT-SVD

In today’s techno savvy era, communication becomes digitally. Due to the explosion of World Wide Web and quick growth of high speed Internet, a huge amount of images are easily available and accessible by any person around the globe. This expansion facilitated that each and every person can communicate by distributing and exchanging the digital data. So in digital world editing, manipulation, copying of digital data has become widespread and becoming a serious issue in the present circumstances. So digital watermarking techniques are became a crucial solution for these issues. In this paper we have developed image watermarking model based on DCT, DWT and alpha blending watermarking technique. We embed and extract biometric watermark using the alpha blending technique in low frequency band. This paper illustrates models and modified algorithms for DCT, DWT and alpha blending watermarking techniques. To demonstrate working of the aforementioned model and algorithm, an experimental system is also developed with different value of alpha for different inputs. This paper also describes output of the experimental system with their comparison.