Pratap Chandra Mandal
Steganography is the science that involves communicating secret data in an appropriate multimedia carrier .The goal here is always to conceal the very existence of the embedded data .Unlike the space domain approaches, secret messages are embedded in the high frequency coefficients resulted from Discrete Wavelet Transform. Coefficients in the low frequency sub-band are preserved unaltered to improve the image quality.In this paper a detailed survey of existing and newly proposed steganographic techniques has been discussed.
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