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Parallel Channel Video Processing

IP.com Disclosure Number: IPCOM000086760D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Siverling, MM: AUTHOR

Abstract

Video system 10 receives parallel video signals 11 from each column of a conventional multirow, multicolumn photodetector array. System 10 produces an equal number of digitized (i.e., black/white) column signals at output 12.

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Parallel Channel Video Processing

Video system 10 receives parallel video signals 11 from each column of a conventional multirow, multicolumn photodetector array. System 10 produces an equal number of digitized (i.e., black/white) column signals at output 12.

A bank of mutually independent amplifiers 13 increases the amplitude of signals 11. Independent white normalizers 14 contain circuits which fix the white
(i.e., background video at a constant absolute voltage level, which is the same for each channel. Threshold generators 15 produce a separate threshold level for each column on lines 16. Each threshold is a function of the video voltages on several adjacent columns. For example, the threshold for a given column might be a constant times the absolute value of the maximum voltage on any of the two columns on either side, minus the normalized white level. In this case, generators 15 would allow a linear change when the highest of these voltages increases, but should not permit any change for a decrease in a lower voltage. That is, they should provide hard switching.

Black peak generator 17 converts multiple-column thresholds 16 into a single signal which may be fed back for partial control of threshold generators 15. A typical circuit for peak generator 17 is shown in M. M. Siverling, "Video Thresholding for Photodetector Arrays", IBM Technical Disclosure Bulletin, Vol. 16, No. 5, October 1973, pp. 1569-1570. Conventional comparators 18 produce a separate binar...