Patent US4259662A successfully refreshed from Google Patents.
US4259662A
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Threshold setting circuit
Assignee: Hajime Industries Ltd
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Filing: 1979-08-29
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Granted: 1981-03-31
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Expires: 1999-08-29
Abstract
Abstract A threshold setting circuit having a detector for detecting the brightest or highest level of a screen which consists of a plurality of picture elements and a device for setting a threshold value by suitably reducing the brightest or highest level detected by the detector.
Inventors
- 👤 Hajime Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:21
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/08; H03K5/082; G; G06; G06V; G06V10/00; G06V10/20; G06V10/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
A threshold value setting circuit for use with a pattern discrimination circuit adapted in video apparatus in which an array of picture elements is scanned to provide corresponding picture element signals, said setting circuit comprising: (a) a plurality of peak selectors and a threshold value setting means, each of said peak selectors having an input and output, each of said inputs being arranged to receive a respective one of said picture element signals, said outputs being connected together and in common to said threshold value setting means, each of said peak selectors providing an output from its respective input unless reverse-biased by a higher output from one of the other peak selectors; and (b) a plurality of comparators, corresponding to the number of peak selectors, each comparator having a pair of inputs and an output, one input of each of said comparators being connected to said common threshold value setting means and another input of each of said comparators being connected to receive a respective one of the picture element signals.
Claim 2
Dependent Claim
171 words
A threshold value setting circuit for use with a pattern discrimination circuit adapted in video apparatus in which an array of picture elements is scanned to provide corresponding picture element signals, said setting circuit comprising: (a) a plurality of peak selectors and a threshold value setting means, each of said peak selectors having an input and output, each of said inputs being arranged to receive a respective one of said picture element signals, said outputs being connected together and in common to said threshold value setting means, each of said peak selectors providing an output from its respective input unless reverse-biased by a higher output from one of the other peak selectors; and (b) a plurality of comparators, corresponding to the number of peak selectors, each comparator having a pair of inputs and an output, one input of each of said comparators being connected to said common threshold value setting means and another input of each of said comparators being connected to receive a respective one of the picture element signals.
Claim 3
Dependent Claim
25 words
The threshold value setting circuit according to claim 1, in which each of said peak selectors comprises a resistor, an operational amplifier and a diode.
Claim 4
Dependent Claim
22 words
The threshold value setting circuit according to claim 1, or 2, in which said common threshold value setting means comprises a potentiometer.
References Cited (Backward Citations)
US3225213A
Cited
US3502993A
Cited
US3675201A
Cited
US3668634A
Cited
US3701099A
Cited
US3820068A
Cited
US4034342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |