Geodesic
Data hiding technique using objects outlines
Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 149 (2007) no. 2, pp. 128-137

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In this paper we propose a new steganography technique. The main concept of the proposed approach lies in use of objects outlines to hide information. The proposed technique is based on aspects of human visual system, provides noise immunity of subliminal channel, complexity of effective passive steganalysis attacks building, low computational complexity, possibility of secret message extraction in case of absence of unmodified cover message. 
@article{UZKU_2007_149_2_a8,
     author = {E. V. Razinkov and R. Kh. Latypov},
     title = {Data hiding technique using objects outlines},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {128--137},
     publisher = {mathdoc},
     volume = {149},
     number = {2},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2007_149_2_a8/}
}
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E. V. Razinkov; R. Kh. Latypov. Data hiding technique using objects outlines. Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 149 (2007) no. 2, pp. 128-137. http://geodesic.mathdoc.fr/item/UZKU_2007_149_2_a8/