Informatics Publishing Limited

D. R. Denslin Brabin ¹, S. Janakiraman ²

Affiliations
1 IT Department, Jaya Engineering College, Chennai, IN
2 Department of CSE, Anna University of Technology, Chennai, IN

Abstract

A secure data hiding method for digital images is proposed here. Min-Max Normalization method is used to provide space to embed secret bits into image pixels. The image pixels are normalized into some short range and then denormalized. The secret bit is directly added to the denormalized image pixel. Message dependent Permutation is performed to generate secret key. XOR operation is performed between the denormalized pixel values of the cover image on the positions according to secret key and the byte values of the secret message to enhance security. The experimental results reveal that the proposed scheme produces well hiding capacity and security.

Keywords

Watermarking, Steganography, Permutation, Normalization.

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D. R. Denslin Brabin ¹, J. Jebamalar Tamilselvi ², S. Janakiraman ³

Affiliations
1 Anna University, Chennai, IN
2 MCA Department, Jaya Engineering College, Chennai, IN
3 CSE Department, Pondicherry University, Pondicherry, IN

Abstract

A novel method is proposed for visible watermarking of digital image in frequency domain. The method is based on DCT modification of original image with respect to watermark image. The host image pixels are transformed into frequency coefficients as well as the watermark image pixels are also transformed into frequency coefficients using DCT. The compound mapping function is used to adjust the pixel values close to those of desired visible watermarks. Thus the watermarking is done in frequency domain using compound mapping function. One who has the watermark image and mapping function parameters only can remove the watermark. Thus it enhances the security. Experimental results demonstrate the effectiveness of the proposed approach.

Keywords

Watermarking, Steganography, Compound Mapping.

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