A Review on Watermarking Techniques for Biometrics
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Abstract
Watermarks are used for decades to verify and authenticate RGB images. Now days, watermarks are incorporated into digital graphics so that original owners can keep their right and ensure the originality of the digital data. However, the biometric images such as fingerprints, are being transferred over internet daily or in a remote AFAS system where database is on other location, thus increasing risk of attacks during transmission. Receivers need a verification system which can verify the integrity of the content. If the images are watermarked, it is easy for the owner to check and verify the images. Every day, lots of development and improvement is being conducted in different branches of this stream. Steganography is used for secure communication, whereas watermarking is used for image and content protection, copyright saving, content authentication and tamper detecting in this paper we present a thorough survey of current existing and newly developing steganography and watermarking techniques.
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Keywords: Watermarking, Watermark Detection, Spatial Domain, Image Transforms, DWT, DCT, DFT.
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