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dc.contributor.authorLai, I-Jenen_US
dc.contributor.authorTsai, Wen-Hsiangen_US
dc.date.accessioned2014-12-08T15:27:39Z-
dc.date.available2014-12-08T15:27:39Z-
dc.date.issued2011-09-01en_US
dc.identifier.issn1556-6013en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TIFS.2011.2135853en_US
dc.identifier.urihttp://hdl.handle.net/11536/19914-
dc.description.abstractA new type of computer art image called secret-fragment-visible mosaic image is proposed, which is created automatically by composing small fragments of a given image to become a target image in a mosaic form, achieving an effect of embedding the given image visibly but secretly in the resulting mosaic image. This effect of information hiding is useful for covert communication or secure keeping of secret images. To create a mosaic image of this type from a given secret color image, the 3-D color space is transformed into a new 1-D colorscale, based on which a new image similarity measure is proposed for selecting from a database a target image that is the most similar to the given secret image. A fast greedy search algorithm is proposed to find a similar tile image in the secret image to fit into each block in the target image. The information of the tile image fitting sequence is embedded into randomly-selected pixels in the created mosaic image by a lossless LSB replacement scheme using a secret key; without the key, the secret image cannot be recovered. The proposed method, originally designed for dealing with color images, is also extended to create grayscale mosaic images which are useful for hiding text-type grayscale document images. An additional measure to enhance the embedded data security is also proposed. Good experimental results show the feasibility of the proposed method.en_US
dc.language.isoen_USen_US
dc.subjectComputer arten_US
dc.subjectcovert communicationen_US
dc.subjectgreedy searchen_US
dc.subjectinformation hidingen_US
dc.subjectsecret-fragment-visible mosaic imageen_US
dc.titleSecret-Fragment-Visible Mosaic Image-A New Computer Art and Its Application to Information Hidingen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TIFS.2011.2135853en_US
dc.identifier.journalIEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITYen_US
dc.citation.volume6en_US
dc.citation.issue3en_US
dc.citation.spage936en_US
dc.citation.epage945en_US
dc.contributor.department資訊工程學系zh_TW
dc.contributor.departmentDepartment of Computer Scienceen_US
dc.identifier.wosnumberWOS:000293924700006-
dc.citation.woscount2-
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