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Optical Data Compactor/Expander

IP.com Disclosure Number: IPCOM000077510D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Bertin, CL: AUTHOR

Abstract

Optical data describing an image is reduced in quantity, by defining and storing the shape of the image and omitting the intervening data within the shape. The image may be reconstructed by integration within the shape outline.

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Optical Data Compactor/Expander

Optical data describing an image is reduced in quantity, by defining and storing the shape of the image and omitting the intervening data within the shape. The image may be reconstructed by integration within the shape outline.

A diode array, typically large source metal-oxide semiconductor field-effect transistors (MOSFET's), includes elements 1 and 2, adapted to receive optical data originating from a light source. Adjacent diodes are interconnected through associated FET devices 3 and 4 to a strobe source 5. Each diode is also connected to a load 6' and a power source. FET's 3 and 4 are connected,through capacitors 7 and 8 to a differential amplifier 9. A difference signal is provided by the amplifier 9 to a latch 10. The output from the latch 10 is to an FET 11 of a read-only store or optically programmable memory having X and Y array lines. Alternatively, the diode array may be read out serially by connecting each amplifier 9 to every other stage in a shift register arrangement. The presence of light on a diode causes its anode voltage to fall and its associated FET 3 or 4 to conduct, when the strobe signal appears. The absence of light on a diode retains its cathode voltage near the power supply voltage, which retains its associated FET 3 or 4 in a nonconducting state when the strobe signal appears. There are three output signals from the amplifier 9 shown in Fig.
2. The latch 10 only responds to a positive signal. Where ligh...