The algorithm nsF5 evolved from the F5 algorithm originally proposed by Andreas Westfeld in 2001. F5 decreases the absolute value of DCT coefficients and incorporates matrix embedding - a coding scheme that decreases the number of changes and consequently increases the steganographic security. F5 embeds only into nonzero AC DCT coefficients; if a coefficient becomes zero after embedding (the so called shrinkage), the same bit is reembedded at the next coefficient. Shrinkage substantially decreases the embedding efficiency as the values +1 and -1 are the most frequent nonzero DCT coefficients in natural images.

nsf5_simulation
nsf5_simulation\cover.jpg
nsf5_simulation\jpeg_read.mexa64
nsf5_simulation\jpeg_read.mexw32
nsf5_simulation\jpeg_write.mexa64
nsf5_simulation\jpeg_write.mexw32
nsf5_simulation\nsf5_simulation.m
nsf5_simulation\test.m

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