US4991127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Offset and gain correction system for image data processing
Assignee: Raytheon Co
•
Filing: 1989-02-27
•
Granted: 1991-02-05
•
Expires: 2009-02-27
Abstract
Abstract An image processing system (10) includes a focal plane array (652) of image detectors (654), each of which produces a signal proportional to incident radiation. The image data signals are arranged in groups, such as rows or columns that are respectively associated with a plurality of select circuits (656) which sequentially select the signals for correction by an associated offset and gain correction circuit (658). The correction circuit includes a pair of shift registers (672, 694) for respectively storing data related to a desired gain correction and offset correction of the data image signal. Under control of a processor, the stored correction data is used to pass the image data signal through a selectively configured network of resistive elements (720, 722) to thereby correct the gain and offset of the signal.
Inventors
- 👤 Rex J. Crookshanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:19
CPC Classifications
G; G06; G06E; G06E3/00; G06E3/001; G06E3/005; H; H04; H04N; H04N25/00; H04N25/60; H04N25/67; H04N25/671; H04N25/20
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
120 words
For use with an image processing system of the type including an array of image sensors each producing a signal representing image data and a processor for processing the image data produced by the array of image sensors, a system for correcting the values of said image data signals produced by said image sensors relative to a reference value, comprising: a plurality of selection means each operative for selecting signals produced by a respectively associated portion of said array of image sensors; and a plurality of signal correction means respectively coupled with said selection means and each operative for correcting the signal values produced by said image sensors corresponding to said respectively associated portion of said array of image sensors.
Claim 2
Dependent Claim
120 words
For use with an image processing system of the type including an array of image sensors each producing a signal representing image data and a processor for processing the image data produced by the array of image sensors, a system for correcting the values of said image data signals produced by said image sensors relative to a reference value, comprising: a plurality of selection means each operative for selecting signals produced by a respectively associated portion of said array of image sensors; and a plurality of signal correction means respectively coupled with said selection means and each operative for correcting the signal values produced by said image sensors corresponding to said respectively associated portion of said array of image sensors.
Claim 3
Dependent Claim
28 words
The system of claim 1, wherein said plurality of selection means and said plurality of correction means are coupled with said array of image sensors and said processor.
Claim 4
Dependent Claim
23 words
The system of claim 1, wherein each of said selection means is controlled by said processor to sequentially select said image data signals.
Claim 5
Dependent Claim
51 words
The system of claim 3, wherein said selection means includes a plurality of inputs for respectively receiving a plurality of said image data signals corresponding to said respectively associated portion of said array of image sensors, an output and means for switching signals from any of said inputs to said output.
Claim 6
Dependent Claim
21 words
The system of claim 4, wherein said inputs are coupled with an aligned set of image sensors defining said array portion.
Claim 7
Dependent Claim
53 words
The system of claim 1, wherein each of correction means includes; storage means for storing data representing a plurality of correction values; and means responsive to said processor for altering the values of the image data signals received by the corresponding correction means in accordance with the data stored in said storage means.
Claim 8
Dependent Claim
25 words
The system of claim 6, wherein said storage means includes first means for storing gain correction data and second means for storing offset correction data.
Claim 9
Dependent Claim
104 words
The system of claim 7, wherein said value altering means includes: first and second pluralities of resistive elements respectively defining differing resistive values; first and second switching means respectively coupled with said first and second pluralities of resistive elements; said first switching means being responsive to the data stored on first storing means for switching said image data signals through said first plurality of resistive elements, said second switching means being responsive to the data stored in said second storing means for switching a source of voltage into a circuit including said second plurality of resistive elements to thereby produce an offset voltage signal.
Claim 10
Dependent Claim
28 words
The system of claim 8, wherein said correction means includes means for combining the gain corrected signal with said offset voltage signal to produce a corrected output signal.
Claim 11
Dependent Claim
55 words
The system of claim 6, wherein each of said value altering means includes: a plurality of resistive elements respectively defining different resistive values, and switch means responsive to the data stored in said storage means for selectively switching certain of said resistive elements into circuit with the image data signals selected by said selection means.
Claim 12
Dependent Claim
115 words
An offset and gain correction system for correcting a plurality of image data signals produced by radiation-responsive image sensors, comprising: means for storing a plurality of gain correction values; means for storing a plurality of offset correction values; gain correction means coupled with said gain correction storage means for altering each of said plurality of image data signals by predetermined gain correction values stored in said gain correction storing means; and offset correction means responsive to said offset correction storage means for adding to each one of said plurality of gain corrected signals predetermined offset correction values stored in said offset correction storing means, to thereby provide a plurality of gain and offset corrected signals.
Claim 13
Dependent Claim
115 words
An offset and gain correction system for correcting a plurality of image data signals produced by radiation-responsive image sensors, comprising: means for storing a plurality of gain correction values; means for storing a plurality of offset correction values; gain correction means coupled with said gain correction storage means for altering each of said plurality of image data signals by predetermined gain correction values stored in said gain correction storing means; and offset correction means responsive to said offset correction storage means for adding to each one of said plurality of gain corrected signals predetermined offset correction values stored in said offset correction storing means, to thereby provide a plurality of gain and offset corrected signals.
Claim 14
Dependent Claim
22 words
The system of claim 11, wherein said gain correction storing means and said offset correction storing means each include a digital memory.
Claim 15
Dependent Claim
20 words
The system of claim 11, including means for successively selecting each one of said signals from said plurality of signals.
Claim 16
Dependent Claim
28 words
The system of claim 13, including means for successively delivering each one of said plurality of gain and offset corrected signals to means for individually storing said signals.
Claim 17
Dependent Claim
46 words
The system of claim 11, wherein said gain correction means includes an analog amplifier having a plurality of selectable resistors responsive to any of said plurality of predetermined gain correction values such that said selected gain correction value defines a gain setting for said analog amplifier.
Claim 18
Dependent Claim
48 words
The system of claim 11, wherein said offset correction means comprises an analog summing circuit having a plurality of selectable summing resistors responsive to any of said plurality of predetermined offset correction values such that said selected offset correction value defines an offset value for said analog summer.
Claim 19
Dependent Claim
33 words
The system of claim 11, including digital processing means for transferring said gain correction values and said offset correction values respectively to said gain correction storing means and said offset correction storage means.
References Cited (Backward Citations)
US4216503A
Cited
US4413287A
Cited
US4525741A
Cited
US4660082A
Cited
US4669052A
Cited
US4744657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |