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Optical Array Signal Conditioning and Compensation

IP.com Disclosure Number: IPCOM000035369D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Dohanich, GJ: AUTHOR [+4]

Abstract

Disclosed is architecture to convert the analog output signals of an optical array to a compensated digital grey-scale representation, as applied to a known TDI (Time Delay and Integration) Array [*].

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Optical Array Signal Conditioning and Compensation

Disclosed is architecture to convert the analog output signals of an optical array to a compensated digital grey-scale representation, as applied to a known TDI (Time Delay and Integration) Array [*].

The analog output of an array represents the illumination level incident on the array. In the referenced array eight output ports each provide 128 pels (picture elements) of video information for a total of 1024 pels. The video is represented by the approximate difference in voltage from the most recent reset level to the current output voltage after a set signal.

The figure is a block diagram for one of the eight output ports of the present embodiment, which performs three basic Tasks: (1) Video amplitude extraction,
(2) "black" level normalization and, (3) "white" level normalization.

Block 1, Input Level Control and Level Shift Circuit, translates the output levels of the referenced TDI Array 2, into the useful input range of Reset A/D 3, and Video A/D 4. The outputs of Reset A/D 3, and Video A/D 4, are combined in Digital Subtract 5. The function of this block is to perform Task 1 by determination of the delta value between the present Video A/D 4 output and the previous Reset A/D 3 output. The resultant Video delta value is input to Digital Subtract 6 where black correction is effected by subtraction of a black value input from Black Offset Memory 7, thus performing Task 2. The output of Digital Subtract 6, which is the delta Video with black level normalization, is input to Digital Multipl...