Patent US5499835A successfully refreshed from Google Patents.
Patent US5513280A successfully refreshed from Google Patents.
US5513280A
Expired / Lapsed
US
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Discrimination of an edge portion of an image from a screen dot portion in an image processing system
Assignee: Canon Inc
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Filing: 1995-05-22
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Granted: 1996-04-30
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Expires: 2015-05-22
Abstract
Abstract There is provided an image processing apparatus comprising an image signal generator having a first processing unit for processing the image signal in a first mode and generating a first processed signal, a discriminator for discriminating characteristics of the image signal, the discriminator having a selector for selecting the first processed signal according to a discrimination result; and a pulse width modulated signal generator for processing the first processed signal from the selector by using a pattern signal and for generating a pulse width modulated signal.
Inventors
- 👤 Naoto Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:47
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4055; H04N1/4056; H04N1/409; H04N1/4092
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
73 words
An image processing apparatus, comprising: a) image signal generating means for generating a digital image signal having multi-bits for each pixel; b) discrimination means for discriminating an edge portion of the digital image signals using a plurality of pixels; c) emphasizing means for emphasizing the digital image signal of the edge portion discriminated by said discriminating means to generate an output signal; and d) pulse-width-modulated signal generating means for modulating the output signal.
Claim 2
Dependent Claim
73 words
An image processing apparatus, comprising: a) image signal generating means for generating a digital image signal having multi-bits for each pixel; b) discrimination means for discriminating an edge portion of the digital image signals using a plurality of pixels; c) emphasizing means for emphasizing the digital image signal of the edge portion discriminated by said discriminating means to generate an output signal; and d) pulse-width-modulated signal generating means for modulating the output signal.
Claim 3
Dependent Claim
48 words
An apparatus according to claim 1, wherein said pulse-width-modulated signal generating means includes means for converting the digital image signal to an analog image signal, means for generating a pattern signal, and means for comparing the analog image signal with the pattern signal to obtain the pulse-width-modulated signal.
Claim 4
Dependent Claim
15 words
An apparatus according to claim 2, wherein the pattern signal is a triangular wave signal.
Claim 5
Dependent Claim
24 words
An apparatus according to claim 1, further comprising means for smoothing the digital image signal of a non-edge portion discriminated by said discrimination means.
Claim 6
Dependent Claim
78 words
Am image processing apparatus comprising: a) image signal generating means for generating a digital image signal having multi-bits for each pixel; b) discriminating means for discriminating an edge portion of the digital image signal using a plurality of pixels; c) smoothing means for smoothing the digital image signal of a non-edge portion discriminated by said discriminating means to generate an output signal; and d) pulse-width-modulated signal generating means for modulating the output signal to generate a pulse-width-modulated signal.
Claim 7
Dependent Claim
78 words
Am image processing apparatus comprising: a) image signal generating means for generating a digital image signal having multi-bits for each pixel; b) discriminating means for discriminating an edge portion of the digital image signal using a plurality of pixels; c) smoothing means for smoothing the digital image signal of a non-edge portion discriminated by said discriminating means to generate an output signal; and d) pulse-width-modulated signal generating means for modulating the output signal to generate a pulse-width-modulated signal.
Claim 8
Dependent Claim
29 words
An apparatus according to claim 5, further comprising image forming means for forming an image on the basis of the pulse-width-modulated signal generated by said pulse-width-modulated signal generating means.
Claim 9
Dependent Claim
60 words
An image processing method, comprising the steps of: a) generating a digital image signal having multi-bits for each pixel; b) discriminating an edge portion of the digital image signals using a plurality of pixels; c) emphasizing the digital image signal of the edge portion discriminated in said discriminating step to generate an output signal; and d) pulse-width-modulating the output signal.
Claim 10
Dependent Claim
60 words
An image processing method, comprising the steps of: a) generating a digital image signal having multi-bits for each pixel; b) discriminating an edge portion of the digital image signals using a plurality of pixels; c) emphasizing the digital image signal of the edge portion discriminated in said discriminating step to generate an output signal; and d) pulse-width-modulating the output signal.
Claim 11
Dependent Claim
42 words
The method according to claim 7, wherein pulse-width modulating the output signal includes converting the digital image signal to an analog image signal, generating a pattern signal, and comparing the analog image signal with the pattern signal to obtain a pulse-width-modulated signal.
Claim 12
Dependent Claim
15 words
The method according to claim 8, wherein the pattern signal is a triangular wave signal.
Claim 13
Dependent Claim
24 words
The method according to claim 7, including the step of: smoothing the digital image signal of a non-edge portion discriminated in said discriminating step.
Claim 14
Dependent Claim
66 words
An image processing method comprising the steps of: a) generating a digital image signal having multi-bits for each pixel; b) discriminating an edge portion of the digital image signal using a plurality of pixels; c) smoothing the digital image signal of a non-edge portion discriminated in said discriminating step to generate an output signal; and d) pulse-width modulating the output signal to generate a pulse-width-modulated signal.
Claim 15
Dependent Claim
66 words
An image processing method comprising the steps of: a) generating a digital image signal having multi-bits for each pixel; b) discriminating an edge portion of the digital image signal using a plurality of pixels; c) smoothing the digital image signal of a non-edge portion discriminated in said discriminating step to generate an output signal; and d) pulse-width modulating the output signal to generate a pulse-width-modulated signal.
Claim 16
Dependent Claim
25 words
The method according to claim 11, including the step of: forming an image on the basis of the pulse-width-modulated signal generated in said pulse-width-modulating step.
References Cited (Backward Citations)
US4595956A
Cited
US4506382A
Cited
CA1192601A
Cited
US4786976A
Cited
US4953114A
Cited
US5018024A
Cited
US5231677A
Cited
US4873537A
Cited
US4800442A
Cited
US4980757A
Cited
JPS6242693A
Cited
US4870499A
Cited
US4819066A
Cited
US4811037A
Cited
US4763199A
Cited
US4897734A
Cited
US4847654A
Cited
US4847695A
Cited
US5023919A
Cited
US5218649A
Cited
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) | 1999-04-30 | 1999-10-30 | 2000-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-30 | 2003-10-30 | 2004-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-30 | 2007-10-30 | 2008-04-30 | $7700.00 | Window Closed / Lapsed |