System and method employing multiple predictor sets to compress

Details System and method employing multiple predictor sets to compress System and method employing multiple predictor sets to compress

1990-10-10

1992-09-29

Brinich, Stephen

Image analysis

Histogram processing

For setting a threshold

382 56, G06K 900

Patent

active

051519496

ABSTRACT:
An image processing system for selecting a set of predictors based on characteristics of the data to be compressed. The image processing system includes a predictor stage, having a multiple predictors, in which input image data is conditioned by a predictor as selected from among a set of predictors according to the number of prediction errors. The set of predictors is selected according to a bit pattern of the input image data. The conditioned data is compressed and transmitted to a decompressor where it is decompressed, depredicted, and output in the form of an image. The data compressing system includes circuitry for determining whether input image data is gradation data or text image data, circuitry for applying a boundary code to the image data when the determining means detects a change point where the image data is changed from the text image to the gradation data or from the gradation data to the text data, and a compressor including boundary code detecting circuitry and two predictor sets respectively for the gradation image data and the text image data after detecting a boundary code, the compressor selects the predictor set most suitable for the input image data.

REFERENCES:
patent: 4513442 (1985-04-01), Scherl
patent: 4528692 (1985-07-01), Umeda et al.
patent: 5038390 (1991-08-01), Ravi Chandran

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