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Browse Prior Art Database

Sense Mark and Count Video Defect Detector

IP.com Disclosure Number: IPCOM000091161D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Turits, AC: AUTHOR

Abstract

Television cameras 2 and 3 compare unknown subject 4 with known subject 5. The unknown or known subject is displayed on monitor 6 and markers are generated to show points where the subjects differ. Counters 7 and 8 are arranged to separately record the number of points where subject 4 is darker or lighter than subject 5. The apparatus is particularly useful for comparing patterns for monolithic circuits.

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Sense Mark and Count Video Defect Detector

Television cameras 2 and 3 compare unknown subject 4 with known subject 5. The unknown or known subject is displayed on monitor 6 and markers are generated to show points where the subjects differ. Counters 7 and 8 are arranged to separately record the number of points where subject 4 is darker or lighter than subject 5.

The apparatus is particularly useful for comparing patterns for monolithic circuits.

Circuit 9 provides horizontal, vertical, blanking, and sync signals to cameras 2 and 3. The video outputs of cameras 2 and 3 are applied to differential amplifier 10. The output of amplifier 10 signifies that subjects 4 and 5 differ at the point being scanned. Threshold detector 11 converts the output of amplifier 10 to a binary-signal indicating whether or not subjects 4 and 5 differ significantly. Delay circuit 12 and And 13 are connected to transmit this output only if the two subjects differ for a significant length of the sweep. Delay circuit 14 and pulse generator 15 produce a pulse on monitor 6 in the next trace at the same relative position as the point of difference. Monitor 6 receives sync signals from circuit 9.

Level detecting circuit 16 is produces a signal at one of two output terminals that signifies whether the output of amplifier 10 is positive or negative with respect to a preset level. The outputs of circuit 16 thus signify that subject 4 is darker or lighter than subject 5. The output of circuit 16 co...