Digital Image Hiding Algorithm for Secret Communication

Abstract

It is important to keep the image secret with the growing popularity of digital media’s through world wide web to avoid geometric attacking and stealing of images. A new digital image hiding algorithm that provides the security of hidden image, Imperceptibility, Robustness, Anti attacking capability is proposed. To achieve this, two different algorithms are used in frequency domain. The first algorithm is Discrete Wavelet Transform (DWT) and the second one is Singular Value Decomposition (SVD). Wavelet coefficients of secret and carrier image is found using DWT. In this the images are divided into four frequency part called LL, LH, HL, and HH. Low frequency component possess main information. So the low frequency part alone taken for the process of SVD to increase imperceptibility. The processed secret image is embedded into the transformed carrier image. From this implementation of new digital image hiding algorithm, image can be stored and transmitted without any loss in that image even after getting affected by external factors such as rotation and noise. The parameter used to test the robustness is peak signal to ratio (PSNR). The experimental results shows that the proposed method is more robust against different kinds of attacks.