Form dropout compression method which handles form white-out and

Details Form dropout compression method which handles form white-out and Form dropout compression method which handles form white-out and

1993-10-27

1996-07-30

Couso, Yon J.

Image analysis

Image compression or coding

382308, 382317, G06K 936

Patent

active

055420079

ABSTRACT:
An improved method is disclosed of compressing, for storage or transmission, the information contained in a bi-level digitized input image by separate handling of a corresponding template image and a compressed image, which method is capable of handling "white-out" areas of the image. In accordance with the method, the template image is subtracted from the input image to generate the compressed image, the subtraction is characterized in that the subtraction step determines, for each pixel, whether the pixel is a "removed pixel" and, if so, the pixel is assigned to be black in the compressed image. A pixel is a "removed pixel" if the corresponding pixel in the template image is black, and the corresponding pixel in the input image is white.

REFERENCES:
patent: 5020122 (1991-05-01), Walsh
patent: 5140650 (1992-08-01), Casey
patent: 5191612 (1993-03-01), Katsuyama
patent: 5202933 (1993-04-01), Bloomberg
patent: 5272764 (1993-12-01), Bloomberg
patent: 5317646 (1994-05-01), Sang, Jr.

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