Browse Prior Art Database

Threshold Detector

IP.com Disclosure Number: IPCOM000053134D
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2005-Feb-12

Publishing Venue

IBM

Related People

Authors:
Schroeder, EN [+details]

Abstract

In optical character recognition (OCR) systems, the document to be processed is exposed to incident light, and a scanner provides an electrical input signal proportional to the intensity of the reflected light provided by each scanned point on the document. A black or white (B/W) decision is then taken for each point by comparing the electrical signal value to a threshold reference value. Due to noise effects, the B/W decision needs rather complex detector systems to be reliable.