US4675744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning system
Assignee: Pitney Bowes Inc
•
Filing: 1984-12-26
•
Granted: 1987-06-23
•
Expires: 2004-12-26
Abstract
Abstract A circuit for a linear camera scanning system converts a linear output to binary bits representing the contrast levels of the picture elements scanned and compares these to be a background level to produce a more accurate representation. The scanning system eliminates the high number of adjustments required in prior systems and sequences binary information so they may be output in a preferred sequential order.
Inventors
- 👤 Harry L. Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:02
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/401
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A scanning circuit comprising: a linear array of light transducers; a plurality of registers; each of said registers being connected to a group of said light transducers to receive outputs therefrom; a first amplifier connected to each of the outputs of said registers; a clamp circuit connected to the output of each of said amplifiers; second amplifiers connected to the output of each of said clamps; a third amplifier connected to the output of one of said clamps; an A/D converter connected to the output of each of said second amplifiers; a background reference circuit connected to said third amplifier; a multiplier connected to one of said A/D converters and to said reference background circuit; and a multiplexer connected to the A/D converters.
Claim 2
Dependent Claim
123 words
A scanning circuit comprising: a linear array of light transducers; a plurality of registers; each of said registers being connected to a group of said light transducers to receive outputs therefrom; a first amplifier connected to each of the outputs of said registers; a clamp circuit connected to the output of each of said amplifiers; second amplifiers connected to the output of each of said clamps; a third amplifier connected to the output of one of said clamps; an A/D converter connected to the output of each of said second amplifiers; a background reference circuit connected to said third amplifier; a multiplier connected to one of said A/D converters and to said reference background circuit; and a multiplexer connected to the A/D converters.
Claim 3
Dependent Claim
19 words
The scanning circuit of claim 1 including means for individually adjusting the gains on said first and second amplifiers.
Claim 4
Dependent Claim
16 words
The scanning circuit of claim 1 including means for correcting for non-uniformity output in said transducers.
Claim 5
Dependent Claim
158 words
A scanning circuit comprising: a linear array of light transducers; a pair of registers; a first of said registers connected to alternating ones said light transducers to receive output signals therefrom; the second of said registers being connected to the remaining alternative ones of said light transducers to receive output signals therefrom; a pair of first amplifiers each connected to the output of one of said first and second registers; a pair of clamp circuits each connected to the output of each of one of said first amplifiers; second amplifiers connected to the output of each of said clamp circuits; a third amplifier connected to the output of one of said clamp circuits; a background reference circuit connected to the output of said third amplifier; an A/D converter connected to the output of each of said second amplifiers; multiplier means connected to said reference circuit and to said A/D converters; and a multiplexer connected to the A/D converters.
Claim 6
Dependent Claim
158 words
A scanning circuit comprising: a linear array of light transducers; a pair of registers; a first of said registers connected to alternating ones said light transducers to receive output signals therefrom; the second of said registers being connected to the remaining alternative ones of said light transducers to receive output signals therefrom; a pair of first amplifiers each connected to the output of one of said first and second registers; a pair of clamp circuits each connected to the output of each of one of said first amplifiers; second amplifiers connected to the output of each of said clamp circuits; a third amplifier connected to the output of one of said clamp circuits; a background reference circuit connected to the output of said third amplifier; an A/D converter connected to the output of each of said second amplifiers; multiplier means connected to said reference circuit and to said A/D converters; and a multiplexer connected to the A/D converters.
Claim 7
Dependent Claim
64 words
The scanning circuit of claim 4 including a pair of non-uniformities correction circuits, a pair of multipliers each connected to receive the output of a said non-uniformities correction circuit and said background reference circuit, each of said multipliers being connected to one of said A/D converters to send a reference signal that is derived from said non-uniformities correction circuit and said background reference circuit.
Claim 8
Dependent Claim
120 words
A scanning system comprising: a linear array of light transducers; means for receiving the output of a first portion of said light transducers; means for receiving the output of a second portion of said light transducers; means for clamping the output of each of said transducers to a control level; means for amplifying the output of each of said light transducers; means for correcting the outputs of said light transducers for non-uniformity in performance of said light transducers in at least one of said portions; means for converting said corrected outputs from an analog signal to a digital signal; and means for receiving digital signals representative of the outputs of said two portions and placing them in a sequential order.
Claim 9
Dependent Claim
120 words
A scanning system comprising: a linear array of light transducers; means for receiving the output of a first portion of said light transducers; means for receiving the output of a second portion of said light transducers; means for clamping the output of each of said transducers to a control level; means for amplifying the output of each of said light transducers; means for correcting the outputs of said light transducers for non-uniformity in performance of said light transducers in at least one of said portions; means for converting said corrected outputs from an analog signal to a digital signal; and means for receiving digital signals representative of the outputs of said two portions and placing them in a sequential order.
Claim 10
Dependent Claim
31 words
The scanning system of claim 6 wherein the light transducers of said first portion are alternative ones of said array and said light transducers of said second portion are the remaining.
References Cited (Backward Citations)
US4589034A
Cited
US4525741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |