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A technique for the lossless compression of images is proposed. The algorithm employed here is based on a hybrid system utilizing a one dimensional (1-D) discrete cosine transform (DCT) to decorrelate the adjacent pixels in each image line in the spatial domain and a one dimensional differentiator to reduce the redundancy in the adjacent transform points in(More)
The two-dimensional adaptive correlation enhancer algorithm (2DACE) is an open-loop adaptive filtering technique that can be applied to synthetic aperture radar (SAR) images for the purpose of reducing speckle. This paper includes the development of the 2DACE algorithm and the optimum filter parameters for this specific task. The unique implementation of(More)
We describe efficient lossless compression methods applicable to mixed types of data. The methods are applicable to situations in which there is a data base containing files with signal and text data, and the files are accessed via a narrow-band channel such as a modem. Theoretical principles are presented, including a discussion of measures of(More)
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