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In this paper, we introduce a new predictive image compression scheme that compresses an image by a set of parameters computed for individual blocks of different types. These parameters include the average and difference of the representative intensities of an image block, together with the index of a pattern associated with the block visual activity. The block representative gray values are computed...
In this paper, we present a data hiding scheme that embeds the secret data into the compression codes of the host image. The compression codes are associated with the visual patterns appearing in image blocks and are computed through a histogram analysis of residual blocks of the host image. The hiding capacity for each compressed block is not fixed and varies with its block type. Blocks with low...
In this paper, a new variable block-size image compression scheme is presented. A quadtree segmentation is employed to generate blocks of variable size according to their visual activity. Inactive blocks are coded by the block mean, while active blocks are coded by the proposed matching algorithm using a set of parameters associated with the pattern appearing inside the block. Both the segmentation...
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