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Contour and Width Sensing

IP.com Disclosure Number: IPCOM000094460D
Original Publication Date: 1965-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Goverde, HC: AUTHOR [+3]

Abstract

Apparatus for scanning a line pattern, e. g., a numeral, and for deriving two variable voltages representing the contour of the left-hand side and the right-hand side of the pattern, respectively, is shown.

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Contour and Width Sensing

Apparatus for scanning a line pattern, e. g., a numeral, and for deriving two variable voltages representing the contour of the left-hand side and the right- hand side of the pattern, respectively, is shown.

A number of photocells 1 disposed in a row collect radiation energy directed to them by an optical system, not shown, which is scanning a numeral 6. A horizontal section of the numerals image 2 is sensed at any one time. As image 2 is swept upward across the row of photocells 1, all of the numeral is scanned from top to bottom, successively.

Each photocell 1 feeds a current indicative of the instantly detected energy to an associated clipping amplifier 3 having two outputs. For the leftmost amplifier 3, the upper output is labelled /1V//0 signifying that this output is at a voltage level of one volt if the associated photocell detects black, i. e., a portion of the numeral. The output is at zero level when the cell detects white, i.e., a portion of the background. The lower output of this amplifier is labelled /6V//0, signifying a six volt output level when black is detected, or ground level during detection of white. As indicated, all upper output levels of amplifiers 3 for black constitute an ascending sequence. All lower outputs for black constitute a descending sequence, when going from left to right. Therefore, the highest upper outputs obtained consecutively correspond to the right-hand contour of the numeral 6. The highest lower outputs currently produced represent the numeral's left-hand contour.

All upper outputs of amplifiers 3 are connected through isolating diodes 4 to common conductor 6. Onl...