Importance

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Abstract

An image composed of binary black and white picture elements (pixels) is progressively transmitted over a narrow-band channel after binary values of all pixels have been formatted into a hierarchical structure of subdivisions of successive halvings from the entire image down to cells of pixels of uniform size and shape. Each formatted value is encoded in accordance with whether the pairs of values from which it is derived are both black, both white or mixed. Transmission of the hierarchical values involves sending the primary value representing an overall midgray mixed value, and following with successively split image values so that the entire image is reconstructed at a remote receiver in progressively finer detail down to cell size. Final resolution, when needed, results from decoding a variable length code for the permutational patterns of pixels within cells in accordance with their probabilities of occurrence. Areas once deemed monotone are complete and are subsequently skipped by both transmitter and receiver.

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First Claim