20-01-2012, 12:18 PM
HIGH CAPACITY,LOSSLESS,SECURE IMAGE STEGANOGRAPHY USING WAVELETS
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IMAGE STEGANOGRAPHY
Steganography means – “COVERED WRITING”.
It’s a concealed communication
Image steganography is the technique hiding a payload (message) is hided
inside cover image (carrier),to get a stego-image.
Cover image is not statistically changed.
The modern example of steganography is a microdot.
DRAWBACKS….
Drawbacks some of the commonly used transforms:
FOURIER TRANSFORM-applicable to only stationary signals. No time-frequency representations.
SHORT TIME FOURIER TRANSFORM :
it is applicable to non stationary signals, there is time–freq. representation, but the resolution is poor.
