Concealing information in image mosaics based on tile image features

摘要

This article presents a steganographic scheme that conceals secret information in image mosaics based on tile image features. An image mosaic, which is composed of many tiles, resembles a source image that is divided into small grids of identical size. The feature values of each grid and tile image are extracted by a wavelet transform. The similarity between a grid and a candidate tile is taken into account and secret data is inserted into a tile image according to its feature value. There is no modification of tile images and the stego-mosaic as a whole resembles its source image. The hidden data can be extracted by finding the feature values of all tile images of the mosaic. The stego-mosaic looks like its source image to avoid any suspicion; the hidden data are secure since no codebook is required to extract the concealed data and they are not easy to extract without knowing the algorithm. In addition, the concealment capacity is easy to expand by taking more bits of the coefficient of each tile. The experimental results have demonstrated that the embedded image mosaics created from the proposed method have good image qualities and large hidden capacity.View full textDownload full textKeywordsdata hiding, steganography, cryptography, image mosaicRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/02533839.2011.565618