  In this paper a DWT based steganography in frequency domain, termed as ATFDWT
has been proposed. Here, the cover image is transformed into the time domain
signal through DWT, resulting four sub-image components as 'Low resolution',
'Horizontal orientation', 'Vertical orientation' and 'Diagonal orientation'.
The secret message/image bits stream in varying positions are embedded in
'Vertical orientation sub-image' followed by reverse transformation to generate
embedded/encrypted image. The decoding is done through the reverse procedure.
The experimental results against statistical and visual attack has been
computed and compared with the existing technique like IAFDDFTT[1], in terms of
Mean Square Error (MSE), Peak Signal to Noise Ratio (PSNR), Standard
Deviation(SD) and Image Fidelity(IF) analysis, which shows better performances
in ATFDWT.
