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Browse Prior Art Database

Document Analysis

IP.com Disclosure Number: IPCOM000051332D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Carothers, JM: AUTHOR [+4]

Abstract

A document scanner 1 is provided with threshold circuitry 2 that can be bypassed to enable evaluation of the suitability of forms or other standard documents 3 for use in this scanner. Such forms typically have colored regions 4 which should not interfere with more significant images.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

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Document Analysis

A document scanner 1 is provided with threshold circuitry 2 that can be bypassed to enable evaluation of the suitability of forms or other standard documents 3 for use in this scanner. Such forms typically have colored regions 4 which should not interfere with more significant images.

Scanner 1 produces a video output signal in the form of analog pulses having a magnitude that is a function of localized reflectivity. Typically, the analog signal is converted to a digital signal by converter 5 and is passed through a threshold circuit 2 where a decision is made to call the signal black or white on an element- by-element basis. The resulting binary information is passed to data processing equipment 6 for storage, recognition, transmission, etc.

To provide reliable processing of document images, certain criteria, (for example, as to background color, proximity of adjacent fields or edge of form) must be met. Selectively operable threshold bypass line 7 is provided to deliver digitized gray scale data directly to data processing equipment 6. This equipment is programmed to test the gray scale data against predetermined contrast and location criteria to evaluate the suitability of a document 3 for use in the scanner.

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