Image data compression method involving deleting data in areas w

Details Image data compression method involving deleting data in areas w Image data compression method involving deleting data in areas w

1993-08-04

1997-05-13

Jankus, Almis R.

Supports: cabinet structure

With movable components

Having biasing means

312162, 312232, G06T 900

Patent

active

056300360

ABSTRACT:
An image data compression method in which reductions in data amount are achieved by deleting some pixel data. Compression is achieved by performing a reading step to read an image as plural pixel data and a deleting step to delete some of the pixel data. A prediction error calculating step calculates a prediction error that represents the difference between the color value pixel data of a pixel in question and the predicted color value thereof, as predicted by a prescribed prediction method from the pixel data of a pixel adjacent thereto. An area classifying step classifies the pixel data of the entire image area into either an abrupt color change areas type in which the prediction error is large or a nonabrupt color change area in which the prediction error is small. The deleting step is performed only on the pixel data classified in the nonabrupt color change area; deleted-position information is appended to the non-deleted pixel data that indicates the position of a pixel whose data has been deleted. This improves the quality of reproduction, since no pixel data are deleted where large errors would be expected to occur in reproduction.

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patent: 4992860 (1991-02-01), Hamasuchi et al.
patent: 5007102 (1991-04-01), Haskell
patent: 5172237 (1992-12-01), Blonstein et al.
patent: 5247589 (1993-09-01), Faul et al.
patent: 5317428 (1994-05-01), Osawa et al.
patent: 5379355 (1995-01-01), Allen

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