Sturdy Reversible Watermarking Using Composite Technique With Emboss Filter

Authors: Tejaswita Salunkhe, Chhaya Nayak

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Abstract

Protection of digital media become unavoidable in today’s world. Due to increase in need to secure digital media from unauthorized access, many watermarking techniques are developed in this paper, we propose a new algorithm for color images along with reversible watermarking. With the help of Discrete Wavelet Transform, watermark embedding and extraction is carried out. Along with Emboss Filter, discrete wavelet transform and discrete cosine transform are used as a composite technique to protect the image from illegitimate users. The Watermarked image’s quality is enhanced by using a composite technique with Emboss filtering. At last we test proposed algorithm on various images with the performance parameter PSNR .The results authenticate that the proposed algorithm improves the quality of cover image Keywords: Reversible Watermarking, Discrete Wavelet Transform, Emboss Filter, Discrete cosine transform, PSNR

Introduction

For distribution of digital media, Internet is the best system. With the increase in use of Internet, Need for transmission and rage of digital images have increased at the same time Intellectual property rights issue arises. Hence for providing authorised access one of the widely used concept is Watermarking. Watermarking is the procedure of embedding a watermark which can be an image or text or binary sequence or a multimedia object into a multimedia data. In this paper, image is used as a digital media. For performing image watermarking, two images required. One image is inserted into another image to protect itself from misuse. The image which is inserted into another image is called the watermark image or the useful information which is to be hidden from unauthorized access. A new concept called as reversible watermarking in which when we extract the watermark we get the host media as it is. The host media is same as it maintains the quality of host media and watermark. Many reversible watermarking methods for various media has been proposed,

Conclusion

We have implemented a sturdy reversible watermarking method with composite technique of emboss filter. Our algorithm successfully improves quality of Watermarked Image. We have applied our algorithm on many images and found that it successfully improves quality of watermarked image.