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US3597083A
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Method and apparatus for detecting registration between multiple images
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1969-04-16
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Granted: 1971-08-03
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Expires: 1989-04-16
Abstract
Abstract This disclosure relates to a method and apparatus for the detection of the relative distortion between two patterns. Analog video signals, obtained by synchronously scanning the two patterns, are converted to binary waveforms having level changes corresponding to zero crossings of the respective analog signals. The binary signals are then compared and the intervals of disagreement noted and assigned a plus or minus sign, depending upon which of the two signals initiated the disagreement. The algebraic sum of the disagreement intervals is shown to be of a magnitude and sign as will indicate the amount and direction of the distortion differences.
Inventors
- 👤 Robert M Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:46
CPC Classifications
G; G06; G06F; G06F17/00; G06F17/10; G06F17/15; G06F17/153; G01; G01C; G01C11/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
145 words
A multiple display comparison apparatus comprising electrical signal generating means for producing a first analog signal representig variable detail along a given path in a first exhibit and a second analog signal representing variable detail along a corresponding path in a second exhibit to be compared with the first exhibit, correlator circuit means for comparing the polarities of said first and second analog signals with respect to a give signal value, said correlator circuit means comprising detector means for determining the disagreement intervals along said given corresponding paths wherein n said first and second analog signals are of opposite polarity with respect to the given signal value and discriminator means for distinguishing first interval portions of said disagreement intervals resulting from polarity reversals in said first analog signal from second interval portions of said disagreement intervals resulting from polarity reversals in said second analog signal.
Claim 2
Dependent Claim
145 words
A multiple display comparison apparatus comprising electrical signal generating means for producing a first analog signal representig variable detail along a given path in a first exhibit and a second analog signal representing variable detail along a corresponding path in a second exhibit to be compared with the first exhibit, correlator circuit means for comparing the polarities of said first and second analog signals with respect to a give signal value, said correlator circuit means comprising detector means for determining the disagreement intervals along said given corresponding paths wherein n said first and second analog signals are of opposite polarity with respect to the given signal value and discriminator means for distinguishing first interval portions of said disagreement intervals resulting from polarity reversals in said first analog signal from second interval portions of said disagreement intervals resulting from polarity reversals in said second analog signal.
Claim 3
Dependent Claim
27 words
A multiple display comparison apparatus according to claim 1 including analyzer means for determining the difference between the combined lengths of said first and second interval portions.
Claim 4
Dependent Claim
86 words
A multiple display comparison apparatus according to claim 1 wherein said detector means comprises conversion means which produces a first binary signal having level changes which correspond to polarity reversals in said first analog signal with respect to said given signal value and a second binary signal having level changes which correspond to polarity reversals in said second analog signal with respect to said given signal value, and comparison means for determining said disagreement intervals by compairing the levels of said first and second binary signals.
Claim 5
Dependent Claim
27 words
A multiple display comparison apparatus according to claim 3 including analyzer means for determining the difference between the combined lengths of said first and second interval portions.
Claim 6
Dependent Claim
20 words
A multiple display comparison apparatus according to claim 4 wherein said measuring means produces a digital output representing said difference.
Claim 7
Dependent Claim
48 words
A multiple display comparison apparatus according to claim 5 wherein said digital output representing said difference comprises addition pulses on an addition line representing the combined lengths of said first intervzl portions and subtraction pulses on a subtraction line representing the combined lengths of said second interval portions.
Claim 8
Dependent Claim
46 words
A multiple display comparison apparatus according to claim 1 wherein said first and second exhibits comprise photographic images having homologous regions, and said first and second analog signals are video signals produced by directing scanning beams through said photographic images along said given and corresponding pahts.
Claim 9
Dependent Claim
27 words
A multiple display comparison apparatus according to claim 7 including analyzer means for determining the difference between the combined lengths of said first and second interval portions.
Claim 10
Dependent Claim
86 words
A multiple display comparison apparatus according to claim 7 wherein said detector means comprises conversion means which produces a first binary signal having level changes which correspond to polarity reversals in said first analog signal with respect to said given signal vaue and a second binary signal having level changes which correspond to polarity reversals in said second analog signal with respect to said given signal value, and comparison means for determining said disagreement by comparing the levels of said first and sec ond binary signals.
Claim 11
Dependent Claim
27 words
A multiple display comparison apparatus according to claim 9 including analyzer means for determining the difference between the combined lengths of said first and second interval portions.
Claim 12
Dependent Claim
20 words
A multiple display comparison apparatus according to claim 10 wherein said measuring means produces a digital output representing said difference.
Claim 13
Dependent Claim
49 words
A multiple display comparison apparatus according to claim 11 wherein said digital output representing said difference comprises a ddition pulses on an addition line representing the combined lengths of said first interval portions and subtraction pulses on a subtraction line representing the combined lengths of said second interval portions.
Claim 14
Independent Claim
122 words
A method for comparing relative e location of detail in similar exhibits comprising the steps of; fproducing a first electrical analog disgnal representing variable detail along a given path in one exhibit , producin a second electrical analog signal representing variable detail along a corresponding path in a nother exhibit, compairing the polarities of the first and second analog signaLs with respect to a given signal value, determining the disagreement intervals along said given and corresponding paths wherein said first and second alalog signals have opposite polairyt with respect to the given signal value, and distingusihing between portions of said disagreement intervals resulting from polarity reversals in said first analog signal and those resulting from polarity reversals in said second analog signal.
Claim 15
Independent Claim
122 words
A method for comparing relative e location of detail in similar exhibits comprising the steps of; fproducing a first electrical analog disgnal representing variable detail along a given path in one exhibit , producin a second electrical analog signal representing variable detail along a corresponding path in a nother exhibit, compairing the polarities of the first and second analog signaLs with respect to a given signal value, determining the disagreement intervals along said given and corresponding paths wherein said first and second alalog signals have opposite polairyt with respect to the given signal value, and distingusihing between portions of said disagreement intervals resulting from polarity reversals in said first analog signal and those resulting from polarity reversals in said second analog signal.
Claim 16
Dependent Claim
24 words
A method according to claim 13 including the steop of determining the difference between the combined lengths of each of said disagreement interval portions.
Claim 17
Dependent Claim
62 words
a method according to claim 14 wherein said comparing step comprises the steps of producing a first b binary signal having level changes corresponding to polarity reversals in said first analog signal with respect to said given signal value and a second binary signal having level changes corresponding to polarity reversals in said second analog signal with respect to given signal value.
References Cited (Backward Citations)
US3246560A
Cited
US3432674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |