Browse Prior Art Database

Line Pattern Sensing System

IP.com Disclosure Number: IPCOM000095120D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Hellerman, L: AUTHOR

Abstract

Signals on lines 1 and 2 have information that is useful for recognizing or otherwise operating on a geometric pattern presented by subject 3. For example, alphabetic and numeric character s can be recognized and bubble chamber tracks can be analyzed by processor 12 when the pattern of the subject is suitably represented in numerical form. Line 2 signals the location of a point on the subject where a line occurs. Line 1 signals the angle of the line at the point.

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Line Pattern Sensing System

Signals on lines 1 and 2 have information that is useful for recognizing or otherwise operating on a geometric pattern presented by subject 3. For example, alphabetic and numeric character s can be recognized and bubble chamber tracks can be analyzed by processor 12 when the pattern of the subject is suitably represented in numerical form. Line 2 signals the location of a point on the subject where a line occurs. Line 1 signals the angle of the line at the point.

Subject 3 is illuminated by lamp 4. Light transmitted by subject 3 is sensed by a photocell that produces an output on line 5.

Mask 6 is positioned in the path of the light from lamp 4 to the photocell. Mask 6 has a light transmitting slot. The photocell responds to a region of subject 3 that is aligned with the slot in mask 6. The output of the photocell signifies the alignment between the rotatable mask and a line on subject 3. The photocell produces a high output when the line is entirely outside the region of the slot.

A slightly lower output is produced when the line intersects the slot at an angle. A significantly lower output is realized when the line subject 3 is aligned with the slot. A threshold sensor receives the photocell output and produces a signal on line 8. Such signifies that the slot is aligned with a line on the subject.

Mask 6 is rotated by rotational drive mechanism 9. Subject 3 is moved in a scanning motion by X-Y drive mechanism 10. Drive 9 produces a s...