US5495350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color image processor which corrects spatial and frequency characteristics of color components
Assignee: Canon Inc
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Filing: 1992-08-07
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Granted: 1996-02-27
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Expires: 2012-08-07
Abstract
Abstract An image reading apparatus which can eliminate a difference of the MTF occurring due to the matching of the positions of the pixels and can perform an accurate color discrimination and can obtain a high image quantity. An image on an original is read through color separation filters of a plurality of colors. By executing position correction arithmetic operations with respect to all of the color pixels which have been read, the pixel positions are corrected without a deviation, thereby setting the MTF of each color pixel to the same level. In the position correction arithmetic operations, by setting a plurality of virtual pixels with respect to each color every pixel on boundaries of different color pixels and by executing the interpolation arithmetic operations, not only the positions can be corrected but also the resolution can be improved.
Inventors
- 👤 Hideaki Shimizu
- 👤 Hidenori Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:31
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/48; H04N1/486; H04N23/00; H04N23/80; H04N23/84; H04N23/843; H04N25/00; H04N25/10; H04N25/11; H04N25/13; H04N25/135; H04N25/136; H04N25/60; H04N25/61; H04N25/615; H04N25/6153; H04N2209/00; H04N2209/04; H04N2209/041; H04N2209/042; H04N2209/045; H04N2209/046
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
96 words
An image processing apparatus comprising: supplying means for supplying plural color component signals, each of which represents pixels of different spatial locations; correcting means which is commonly used for correcting both of the spatial locations and spatial frequency characteristics of the plural color component signals, said correcting means performing correction on each of the plural color component signals so as to improve matching between the spatial frequency characteristics of each of the plural color component signals; and discriminating means for discriminating a predetermined color based on the plural color component signals corrected by said correcting means.
Claim 2
Dependent Claim
96 words
An image processing apparatus comprising: supplying means for supplying plural color component signals, each of which represents pixels of different spatial locations; correcting means which is commonly used for correcting both of the spatial locations and spatial frequency characteristics of the plural color component signals, said correcting means performing correction on each of the plural color component signals so as to improve matching between the spatial frequency characteristics of each of the plural color component signals; and discriminating means for discriminating a predetermined color based on the plural color component signals corrected by said correcting means.
Claim 3
Dependent Claim
16 words
An apparatus according to claim 1, wherein said supplying means is comprised by a line sensor.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 2, wherein said line sensor is formed by alternately arranging a plurality of filters of different characteristics on one line.
Claim 5
Dependent Claim
29 words
An apparatus according to claim 1, wherein said correcting means corrects the spatial locations and the spatial frequency characteristics of the color component signals by pixel interpolation arithmetic operations.
Claim 6
Dependent Claim
25 words
An apparatus according to claim 1, further having means for performing a color discrimination by using the color component signals corrected by said correcting means.
Claim 7
Dependent Claim
86 words
An image procession method comprising the steps of: supplying plural color component signals, each of which represents pixels of different spatial locations; correcting both of the spatial locations and spatial frequency characteristics of the plural color component signals, said correcting step being performed on each of the plural color component signals so as to improve matching between the spatial frequency characteristics of each of the plural color component signals; and discriminating a predetermined color based on the plural color component signals corrected in said correcting step.
Claim 8
Dependent Claim
86 words
An image procession method comprising the steps of: supplying plural color component signals, each of which represents pixels of different spatial locations; correcting both of the spatial locations and spatial frequency characteristics of the plural color component signals, said correcting step being performed on each of the plural color component signals so as to improve matching between the spatial frequency characteristics of each of the plural color component signals; and discriminating a predetermined color based on the plural color component signals corrected in said correcting step.
Claim 9
Dependent Claim
111 words
An image processing apparatus comprising: a line sensor for generating plural color component signals, said line sensor being formed by alternately arranging a plurality of filters of different characteristics corresponding to said plural color component signals on one line; correcting means which is commonly used for correcting both of spatial locations and spatial frequency characteristics of the plural color component signals, said correcting means performing correction on each of the plural color component signals so as to improve matching between spatial frequency characteristics of each of the plural color component signals; and discriminating means for discriminating a predetermined color based on the plural color component signals corrected by said correcting means.
Claim 10
Dependent Claim
111 words
An image processing apparatus comprising: a line sensor for generating plural color component signals, said line sensor being formed by alternately arranging a plurality of filters of different characteristics corresponding to said plural color component signals on one line; correcting means which is commonly used for correcting both of spatial locations and spatial frequency characteristics of the plural color component signals, said correcting means performing correction on each of the plural color component signals so as to improve matching between spatial frequency characteristics of each of the plural color component signals; and discriminating means for discriminating a predetermined color based on the plural color component signals corrected by said correcting means.
Claim 11
Dependent Claim
29 words
An apparatus according to claim 7, wherein said correcting means corrects the spatial locations and the spatial frequency characteristics of the color component signals by pixel interpolation arithmetic operations.
Claim 12
Dependent Claim
25 words
An apparatus according to claim 7, further having means for performing a color discrimination by using the color component signals corrected by said correcting means.
Claim 13
Dependent Claim
131 words
An image processing apparatus comprising: scanning means for scanning an original and for generating plural color component signals, each of which represents pixels of different spatial locations; correcting means which is commonly used for correcting both of the spatial locations and spatial frequency characteristics of the plural color component signals; discriminating means for discriminating a predetermined color based on the plural color component signals corrected by said correcting means; and processing means for processing the plural color component signals corrected by said correcting means in accordance with discriminating results of said discriminating means and for generating a reproduction signal, wherein said correcting means performs correction on each of the plural color component signals so as to improve matching between the spatial frequency characteristics of each of the plural color component signals.
Claim 14
Dependent Claim
131 words
An image processing apparatus comprising: scanning means for scanning an original and for generating plural color component signals, each of which represents pixels of different spatial locations; correcting means which is commonly used for correcting both of the spatial locations and spatial frequency characteristics of the plural color component signals; discriminating means for discriminating a predetermined color based on the plural color component signals corrected by said correcting means; and processing means for processing the plural color component signals corrected by said correcting means in accordance with discriminating results of said discriminating means and for generating a reproduction signal, wherein said correcting means performs correction on each of the plural color component signals so as to improve matching between the spatial frequency characteristics of each of the plural color component signals.
Claim 15
Dependent Claim
29 words
An apparatus according to claim 10, wherein said correcting means corrects the spatial locations and the spatial frequency characteristics of the color component signals by pixel interpolation arithmetic operations.
Claim 16
Dependent Claim
24 words
An apparatus according to claim 10, wherein said processing means includes color discriminating means for discriminating a color represented by the color component signals.
Claim 17
Dependent Claim
26 words
An apparatus according to claim 10, further having image forming means for forming an image in accordance with the reproduction signal generated by said processing means.
Claim 18
Dependent Claim
19 words
An apparatus according to claim 13, wherein said image forming means forms an image by using a laser beam.
Claim 19
Dependent Claim
29 words
An apparatus according to claim 13, wherein said image forming means has heads of the type for emitting liquid droplets by using a film boiling by a thermal energy.
References Cited (Backward Citations)
US4595958A
Cited
US4672433A
Cited
US4712141A
Cited
US4864357A
Cited
US4992860A
Cited
US5166809A
Cited
US5339171A
Cited
US5327257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |