Patent US5239383A successfully refreshed from Google Patents.
US5239383A
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Image processing apparatus capable of image editing
Assignee: Canon Inc
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Filing: 1990-05-04
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Granted: 1993-08-24
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Expires: 2010-05-04
Abstract
Abstract An image processing apparatus is provided with an input circuit for inputting a plurality of multilevel signals, each corresponding to a respective one of a plurality of pixels. An emphasizing circuit emphasizes a high frequency component of one of the multilevel image signals by using the multilevel image signals of a plurality of pixels and outputs the emphasized multilevel image signal. A discriminator discriminates a dot area of an image represented by the one multilevel signal input by the input circuit, by using the multilevel image signals of the plurality of pixels whose high frequency component is emphasized by the emphasizing circuit. The number of pixels used by the discriminator is larger than the number of pixels used by the emphasizing circuit.
Inventors
- 👤 Yoshinori Ikeda
- 👤 Hiroyuki Ichikawa
- 👤 Mitsuru Kurita
- 👤 Kimiyoshi Hayashi
- 👤 Toshio Honma
- 👤 Yoshiko Horie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:56
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; H04N1/4092; H04N1/40062
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
120 words
An image processing apparatus comprising: means for inputting a plurality multilevel image signals, each corresponding to a respective one of a plurality of pixels; means for emphasizing a high-frequency component of one of the multilevel image signals by using the multilevel image signals of the plurality of pixels and for outputting the emphasized multilevel image signal; and means for discriminating a dot area of an image represented by the one multilevel image signal input by said input means, by using the multilevel image signals of the plurality of pixels whose high-frequency component is emphasized by said emphasizing means, wherein a number of pixels used by said discriminating means is larger than a number of pixels used by said emphasizing means.
Claim 2
Dependent Claim
120 words
An image processing apparatus comprising: means for inputting a plurality multilevel image signals, each corresponding to a respective one of a plurality of pixels; means for emphasizing a high-frequency component of one of the multilevel image signals by using the multilevel image signals of the plurality of pixels and for outputting the emphasized multilevel image signal; and means for discriminating a dot area of an image represented by the one multilevel image signal input by said input means, by using the multilevel image signals of the plurality of pixels whose high-frequency component is emphasized by said emphasizing means, wherein a number of pixels used by said discriminating means is larger than a number of pixels used by said emphasizing means.
Claim 3
Dependent Claim
15 words
An apparatus according to claim 1, wherein said emphasizing means comprises an edge emphasis filter.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 1, further comprising binarization means for binarizing the multilevel image signal emphasized by said emphasizing means.
Claim 5
Dependent Claim
30 words
An apparatus according to claim 3, wherein said discrimination means discriminates the dot area of the image on in accordance with the multilevel image signal binarized by said binarization means.
Claim 6
Dependent Claim
27 words
An apparatus according to claim 1, further comprising means for detecting a black character of an image in accordance with a discrimination result of said discrimination means.
Claim 7
Dependent Claim
32 words
An apparatus according to claim 1, further comprising processing means for processing the one multilevel image signal input by said input means, in accordance with a discrimination result by said discriminating means.
Claim 8
Dependent Claim
14 words
An apparatus according to claim 6, wherein said processing means includes electrophotographic processing means.
Claim 9
Dependent Claim
14 words
An apparatus according to claim 6, wherein said processing means includes a bubble-jet head.
Claim 10
Dependent Claim
18 words
An apparatus according to claim 1, wherein said input means inputs a plurality of multilevel color component signals.
Claim 11
Dependent Claim
15 words
An apparatus according to claim 1, wherein said input means comprises a CCD line sensor.
Claim 12
Dependent Claim
29 words
An apparatus according to claim 1, wherein said input means comprises conversion means for scanning an original and for converting the original into a plurality of color component signals.
Claim 13
Dependent Claim
113 words
An image processing method comprising the steps of: a) inputting plural multilevel image signals, each corresponding to a respective one of a plurality of pixels; b) emphasizing a high-frequency component of one of the multilevel image signals by using the multilevel image signals of the plurality of pixels and outputting the emphasized multilevel image signal; and c) discriminating a dot area of an image represented by the one multilevel image signal by using the multilevel image signals of a plurality of pixels whose high-frequency component is emphasized in said emphasizing step, wherein a number of pixels used in said discriminating step is larger than a number of pixels used in said emphasizing step.
Claim 14
Dependent Claim
113 words
An image processing method comprising the steps of: a) inputting plural multilevel image signals, each corresponding to a respective one of a plurality of pixels; b) emphasizing a high-frequency component of one of the multilevel image signals by using the multilevel image signals of the plurality of pixels and outputting the emphasized multilevel image signal; and c) discriminating a dot area of an image represented by the one multilevel image signal by using the multilevel image signals of a plurality of pixels whose high-frequency component is emphasized in said emphasizing step, wherein a number of pixels used in said discriminating step is larger than a number of pixels used in said emphasizing step.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |