D. Gruhl, N. Morimoto, and W. Bender, "The data hiding homepage," http://nif.www.media.mit.edu/DataHiding/index.html, vol. 21, no. 2, pp. 120--126, 1978.  Home/Search   Document Not in Database   Summary   Related Articles

....the DCT or wavelet transform of a block in an image. Ref. 4] discusses data hiding in images by exploiting the properties of the human visual system (HVS) such as sensitivity to contrast as a function of spatial frequency, the masking effect of edges, and sensitivity to changes in grayscale. In [4, 18], techniques for data hiding in images are discussed. The first, an LSB method called Patchwork, is a statistical technique which randomly chooses n pairs (a i ; b i ) of points in an image and increases the brightness of a i by one unit while simultaneously decreasing the brightness of b i . ....

....unit while simultaneously decreasing the brightness of b i . The second, texture block coding, hides data by mapping a random texture pattern in an image to another region in the image with a similar texture pattern. This method is limited to images that possess large areas of random texture. In [18], an encoding scheme is made resistant to affine transformations (scaling, translations, rotations) by embedding crosses in an image. Xerox DataGlyph technology [4, 19] adds a barcode to its images according to a predetermined set of geometric modifications. In [20] data is hidden in the ....

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D. Gruhl, N. Morimoto, and W. Bender, "The data hiding homepage," http://nif.www.media.mit.edu/DataHiding/index.html, vol. 21, no. 2, pp. 120--126, 1978.

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