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Steganography is the technique of hiding information inside
other information. It provides data security. Image steganography can be implemented
in both, the spatial and transform domain. In this study, transform domain steganography
has been adopted. A cover image is transformed to the frequency domain using
Integer Wavelet Transform (IWT) and a secret image is embedded in it using Least
Significant Bit (LSB) substitution. The secret data is embedded only in high
frequency sub-bands of the frequency domain transform of the cover image. Both
adaptive and non-adaptive embedding techniques are employed and the results
are compared. Also, random traversing for embedding the secret data is implemented
for higher security. Haar and (5/3) IWT based algorithms are used. The Peak
Signal to Noise Ratio (PSNR) values and payload capacity are obtained and compared
for above algorithms.
