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US5818973A
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Apparatus for digital correction in an image system
Assignee: Hanger Solutions LLC
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Filing: 1996-01-11
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Granted: 1998-10-06
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Expires: 2016-01-11
Abstract
Abstract An apparatus for digital correction in an image system is disclosed. The present invention comprises pre-processing means for automatically adjusting dc gain of an image signal; an analogue-to-digital converter for converting the adjusted image signal to a digital signal; bit-enhancing means for generating a bit-enhanced signal; and post-processing means for generating an image code by processing the bit-enhanced signal through highlight, shadow, Gamma and shading correction. The present invention provides an improved apparatus for correcting the photo-response non-uniformity, avoiding image defect, without sacrificing the accuracy of the image system.
Inventors
- 👤 Chuan Yu Hsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:23
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40006; H04N23/00; H04N23/80; H04N23/81; H04N1/401; H04N25/00; H04N25/70; H04N25/701; H04N5/00; H04N5/14; H04N5/21
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
72 words
An apparatus for digital correction in an image system comprising: pre-processing means for adjusting a dc gain of an image signal; an analogue-to-digital converter for converting the adjusted image signal to a digital signal; bit-enhancing means for generating a bit-enhanced signal according to the digital signal and a plurality of neighboring pixels; and post-processing means for generating an image code by processing the bit-enhanced signal through shading, highlight, shadow, and Gamma correction.
Claim 2
Independent Claim
72 words
An apparatus for digital correction in an image system comprising: pre-processing means for adjusting a dc gain of an image signal; an analogue-to-digital converter for converting the adjusted image signal to a digital signal; bit-enhancing means for generating a bit-enhanced signal according to the digital signal and a plurality of neighboring pixels; and post-processing means for generating an image code by processing the bit-enhanced signal through shading, highlight, shadow, and Gamma correction.
Claim 3
Dependent Claim
15 words
The apparatus according to claim 1, wherein said pre-processing means is a DC-gain voltage amplifier.
Claim 4
Dependent Claim
18 words
The apparatus according to claim 1, wherein said bit-enhancing means further performs calculating for generating said bit-enhanced signal.
Claim 5
Dependent Claim
24 words
The apparatus according to claim 3, wherein said bit-enhancing means is a matrix filter having dimension m×n, wherein m and n are positive integers.
Claim 6
Dependent Claim
13 words
The apparatus according to claim 4, wherein said matrix filter has dimension 3×3.
Claim 7
Dependent Claim
49 words
The apparatus according to claim 5, wherein said matrix filter performs calculating which comprises the steps of: (a) calculating a first average of the eight neighboring pixels; and (b) generating said bit-enhanced signal by calculating a second average of the first average and the value of said digital signal.
Claim 8
Dependent Claim
13 words
The apparatus according to claim 4, wherein said matrix filter has dimension 1×3.
Claim 9
Dependent Claim
13 words
The apparatus according to claim 1, wherein said post-processing means is a divider.
Claim 10
Dependent Claim
13 words
The apparatus according to claim 1, wherein said post-processing means is a multiplier.
Claim 11
Dependent Claim
21 words
The apparatus according to claim 1, wherein said post-processing means is further responsive to a shading vector for correcting shading phenomenon.
Claim 12
Dependent Claim
22 words
The apparatus according to claim 1, wherein said post-processing means is further responsive to a Gamma vector for correcting contrast of image.
Claim 13
Dependent Claim
17 words
The apparatus according to claim 1, wherein said post-processing means is further responsive to a highlight vector.
Claim 14
Dependent Claim
17 words
The apparatus according to claim 1, wherein said post-processing means is further responsive to a shadow vector.
Claim 15
Dependent Claim
15 words
The apparatus according to claim 1, further comprising a buffer for storing said image code.
Claim 16
Dependent Claim
19 words
The apparatus according to claim 1, further comprising a converting means for converting an image to said image signal.
Claim 17
Dependent Claim
16 words
The apparatus according to claim 15, wherein said converting means comprises at least one charge-coupled device.
Claim 18
Independent Claim
123 words
An apparatus for digital correction in an image system comprising: charge-coupled device for converting an image to an image signal; a dc-gain voltage amplifier for adjusting dc gain of the image signal to compensate for fluctuation of the image signal or aging of the charge-coupled device; an analogue-to-digital converter for converting the adjusted image signal to a digital signal; a matrix filter having dimension m×n, wherein m and n are positive integers, for generating a bit-enhanced signal according to the digital signal and a plurality of neighboring pixels; post-processing means for generating an image code by processing the bit-enhanced signal responsive to a shading vector, a Gamma vector, a highlight vector, and a shadow vector; and a buffer for storing the image code.
Claim 19
Independent Claim
123 words
An apparatus for digital correction in an image system comprising: charge-coupled device for converting an image to an image signal; a dc-gain voltage amplifier for adjusting dc gain of the image signal to compensate for fluctuation of the image signal or aging of the charge-coupled device; an analogue-to-digital converter for converting the adjusted image signal to a digital signal; a matrix filter having dimension m×n, wherein m and n are positive integers, for generating a bit-enhanced signal according to the digital signal and a plurality of neighboring pixels; post-processing means for generating an image code by processing the bit-enhanced signal responsive to a shading vector, a Gamma vector, a highlight vector, and a shadow vector; and a buffer for storing the image code.
Claim 20
Dependent Claim
56 words
The apparatus according to claim 17, wherein said matrix filter has dimension 3×3, and said matrix filter performs calculation which comprises the steps of: (a) calculating a first average of the eight neighboring pixels; and (b) generating said bit-enhanced signal by calculating a second average of the first average and the value of said digital signal.
Claim 21
Dependent Claim
16 words
The apparatus according to claim 17, wherein said post-processing means is a divider or a multiplier.
References Cited (Backward Citations)
US5561724A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-10-05 | 2002-04-06 | 2002-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-05 | 2006-04-06 | 2006-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-05 | 2010-04-06 | 2010-10-06 | $7700.00 | Window Closed / Lapsed |