Secured Data Transmission Scheme using Discrete Wavelet Transform Decomposition for Still Images

Secured transmission of information over the unreliable wireless channel is a profound research work in the field of wireless communication. In spite of the availability of various algorithms and their implementations, yet there is a need for improved methods of transfer of information. Steganography is one such technique through which secured data transfer is made possible. By hiding the highly sensitive information in embedding inside the cover image, using image steganography information sharing is authenticated. In this work, the cover image is decomposed and proper sub image is chosen using discrete wavelet packet transform and the sensitive information is hidden at the transmitter section. The wireless channel behavior is mimicked by introducing noises and the detection and recovery of the hidden information at the receiver is carried out. The performance is analyzed with standard metrics like Mean Square Error (MSE) and Peak Signal to Noise Ratio (PSNR). The PSNR achieved is 92.5% which is sufficient enough for image steganography techniques. By incorporating transform based techniques other than DWT, the performance could be improved