US6556313B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vector method for color misregistration detection in image data
Assignee: Sharp Corp
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Filing: 1999-09-27
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Granted: 2003-04-29
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Expires: 2019-09-27
Abstract
Abstract A method for color misregistration detection. Input image data is buffered and transferred to vector space. An examination window for a current pixel is established and foreground and background pixels within that window are selected. The current pixel is examined to determine if it is in an edge of a scanned object. If the current pixel is in an edge, it is analyzed for color misregistration. The analysis includes an application of Stokes' theorem. If the results of the application of Stokes' theorem indicate that the color misregistration is above a threshold, the pixel is identified as having color misregistration.
Inventors
- 👤 William Ho Chang
- 👤 Makoto Otsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:16
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/58
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
A method for detecting color misregistration of input images, comprising the steps of: a) buffering image data received from an image capture device in the form of color space data; b) transferring said color space data to vector space; c) establishing a window around and including a current pixel; d) selecting foreground and background pixels in said window; e) determining if said current pixel is in an edge of an object; and f) analyzing said pixel by integrating across several pixels in said window to determine if the magnitude of color misregistration exceeds a threshold, if said pixel is in an edge of an object.
Claim 2
Independent Claim
105 words
A method for detecting color misregistration of input images, comprising the steps of: a) buffering image data received from an image capture device in the form of color space data; b) transferring said color space data to vector space; c) establishing a window around and including a current pixel; d) selecting foreground and background pixels in said window; e) determining if said current pixel is in an edge of an object; and f) analyzing said pixel by integrating across several pixels in said window to determine if the magnitude of color misregistration exceeds a threshold, if said pixel is in an edge of an object.
Claim 3
Dependent Claim
35 words
The method as claimed in claim 1 wherein said method further includes a step of initially determining if a pixel is on an edge, said step occurring between said establishing step and said selecting steps.
Claim 4
Dependent Claim
31 words
The method as claimed in claim 1 wherein said establishing step further comprises establishing a window of 5 pixels in the sub-scan direction and 1 pixel in the main scan direction.
Claim 5
Dependent Claim
25 words
The method as claimed in claim 1 , wherein said determining step further comprises a gradient check and a luminance check on said current pixel.
Claim 6
Dependent Claim
21 words
The method as claimed in claim 1 , wherein said analyzing step further comprises applying Stokes' theorem to said vector space.
Claim 7
Dependent Claim
14 words
The method as claimed in claim 1 , wherein said color space is RGB.
Claim 8
Dependent Claim
14 words
The method as claimed in claim 1 , wherein said color space is CMY.
Claim 9
Dependent Claim
14 words
The method as claimed in claim 1 , wherein said color space is CMYK.
Claim 10
Dependent Claim
19 words
The method as claimed in claim 1 , wherein said color space is a luminance and chrominance color space.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-04-28 | 2006-10-28 | 2007-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-04-28 | 2010-10-28 | 2011-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-04-28 | 2014-10-28 | 2015-04-29 | $7700.00 | Window Closed / Lapsed |