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A salt & pepper noise fast filtering algorithm for grayscale images based on neighborhood correlation detection is presented. By utilizing a 4×4 pixel template, the algorithm can discriminate and filter various patterns of salt & pepper noise spots or blocks within 2×2 pixel size range. In contrast with many kinds of median filtering algorithm, which may cause image blurring, it has much higher...
LSB matching improves the security of hidden message through changing the pixelpsilas LSB randomly, which breaks the rules of pairs of values in LSB replacement. This paper proposed a new steganalysis technique which aims at LSB matching embedding based on the local areapsilas correlation in grayscale images. The detection method defines the correlation between regional pixels as the difference between...
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