Browse Prior Art Database

Pictorial Information Disector and Analyzer System (PIDAS)

IP.com Disclosure Number: IPCOM000077076D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 3 page(s) / 53K

Publishing Venue

IBM

Related People

Crawford, JL: AUTHOR

Abstract

This system provides a unique approach to the measurement of optical character recognition (OCR) print quality which provides repeatability, flexibility and a thoroughness that previous methods have lacked. The PIDAS approach consists of scanning printed documents with an optical scanner to provide a digital image to a computer for software extraction of specified print quality parameters. Hardware flexibility and software analysis of the data allows the measurements to flow with the very fluid print quality parameter definitions, and also provides a very powerful tool for implementing the rather sophisticated measurements that have evolved through the efforts to define meaningful indicators of print quality.

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Pictorial Information Disector and Analyzer System (PIDAS)

This system provides a unique approach to the measurement of optical character recognition (OCR) print quality which provides repeatability, flexibility and a thoroughness that previous methods have lacked. The PIDAS approach consists of scanning printed documents with an optical scanner to provide a digital image to a computer for software extraction of specified print quality parameters. Hardware flexibility and software analysis of the data allows the measurements to flow with the very fluid print quality parameter definitions, and also provides a very powerful tool for implementing the rather sophisticated measurements that have evolved through the efforts to define meaningful indicators of print quality.

A test document 1 is placed against an aligning bar on rotatable drum 2. The document is held in place by a vacuum pump 3. An incremental encoder 4 which is integral with the drum shaft provides encoding pulses to the frequency divider 5 and the skip function 6. The frequency divider allows the operator through manual or program control to select the desired increments during circumferential scan; the skip function allows the reading mechanism to skip to any desired location along he line. Horizontal movement along the document is provided by lead screw 7 which is driven by stepping motor 8. The stepping motor is also under program control.

The document is illuminated by tungsten lamp 9 through light pipes 10. The reflected image from the document is focused by lens 11 at the aperture 12; the aperture size and shape is variable to allow the resolution desired. A beam splitter 13 is placed between the objective lens and the aperture to allow the operator to visually o...