Browse Prior Art Database

Size Invariant Pattern Recognition

IP.com Disclosure Number: IPCOM000097357D
Original Publication Date: 1962-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Gunn, JB: AUTHOR

Abstract

This system recognizes size invariant pattern recognition by scanning the pattern f(x, y) to be recognized with a light beam I varying in space and time according to I=I(o)x/-1/›1+sin(x*e/t/)| and generated by a cathode ray tube scanner 1 under the control of an intensity signal v2(t) and deflection signals v1(t) and v3(t). The x-1 factor is accomplished by the use of a wedge 2 of semi-transparent material. The scanning beam is reflected by the document 3 toward a photomultiplier 4 which collects all of the reflected light and provides an output signal (Image Omitted) This signal is applied to a differentiator circuit 5 which provides an output proportional to (Image Omitted)

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.

Page 1 of 2

Size Invariant Pattern Recognition

This system recognizes size invariant pattern recognition by scanning the pattern f(x, y) to be recognized with a light beam I varying in space and time according to I=I(o)x/-1/>1+sin(x*e/t/)| and generated by a cathode ray tube scanner 1 under the control of an intensity signal v2(t) and deflection signals v1(t) and v3(t). The x-1 factor is accomplished by the use of a wedge 2 of semi-transparent material. The scanning beam is reflected by the document 3 toward a photomultiplier 4 which collects all of the reflected light and provides an output signal

(Image Omitted)

This signal is applied to a differentiator circuit 5 which provides an output proportional to

(Image Omitted)

This time-varying signal has a shape which is invariant with respect to the size of the pattern to be recognized. The size of the pattern merely determines the time of occurrence of the signal. The differentiator circuit output is applied to a comparison circuit 6. This compares this signal to similar signals corresponding to reference patterns and an indication of the identity of the input pattern is provided on a lead 7.

Other scanning techniques can also be employed, including moire fringe patterns.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]