Patent EP0216536A2 successfully refreshed from Google Patents.
EP0216536A2
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Image processing apparatus
Assignee: Canon Inc
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Filing: 1986-08-29
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Granted: —
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Expires: 2006-08-29
Abstract
Abstract There is provided an image processing apparatus comprising an image signal generator having a first processing unit, such as a smoothing circuit (8b) for processing the image signal in a first mode and generating a first processed signal, a discriminator (13) for discriminating characteristics of the image signal, the discriminator having a selector (9) for selecting the first processed signal according to a discrimination result; and a pulse width modulated signal generator (4,12) 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
- 👤 Hiroaki Ishii
- 👤 Yoshiyuki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 22:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; H04N1/4092; H04N1/405; H04N1/4055; H04N1/4056
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
105 words
An image processing apparatus comprising: image signal generating means for generating an image signal, wherein said image signal generating means comprises a first processing unit for processing the image signal in a first mode and generating a first processed signal, discriminating means for discriminating characteristics of the image signal generated by said image signal generating means, wherein said discriminating means comprises selecting means for selecting the first processed signal in accordance with a discrimination result; and pulse width modulated signal generating means for processing the first processed signal from said selecting means by using a pattern signal and for generating a pulse width modulated signal.
Claim 2
Dependent Claim
105 words
An image processing apparatus comprising: image signal generating means for generating an image signal, wherein said image signal generating means comprises a first processing unit for processing the image signal in a first mode and generating a first processed signal, discriminating means for discriminating characteristics of the image signal generated by said image signal generating means, wherein said discriminating means comprises selecting means for selecting the first processed signal in accordance with a discrimination result; and pulse width modulated signal generating means for processing the first processed signal from said selecting means by using a pattern signal and for generating a pulse width modulated signal.
Claim 3
Dependent Claim
60 words
An apparatus according to claim 1, wherein said selecting means selects one of the first processed signal and the image signal in accordance with the discrimination result from said discriminating means, and wherein said pulse width modulated signal generating means uses the pattern signal to process the signal selected by said selecting means and outputs the pulse width modulated signal.
Claim 4
Dependent Claim
84 words
An apparatus according to claim 1, wherein said image signal generating means comprises a second processing unit for processing the image signal in a second mode and generating a second processed signal, and said selecting means selects one of the first and second processed signals in accordance with the discrimination result of said discriminating means, and wherein said pulse width modulated signal generating means uses the pattern signal to process the signal selected by said selecting means and outputs the pulse width modulated signal.
Claim 5
Independent Claim
21 words
An apparatus according to any preceding claim wherein said first processing unit smoothes the image signal and outputs a smoothed signal.
Claim 6
Dependent Claim
33 words
An apparatus according to claim 3 or claims 3 and 4 wherein said second processing unit emphasizes a high frequency area of the image signal and generates a high frequency area emphasized signal.
Claim 7
Dependent Claim
107 words
An image processing apparatus comprising: image signal generating means for generating an image signal; discriminating means for discriminating characteristics of the image signal generated by said image signal generating means; and pulse width modulated signal generating means for processing the image signal, generated by said image signal generating means by using a pattern signal and outputting a pulse width modulated signal; wherein said pulse width modulated signal generating means comprises pattern signal generating means capable of generating first and second pattern signals having different periods, and selecting means for selecting one of the first and second signals in accordance with a discrimination result of said discriminating means.
Claim 8
Dependent Claim
107 words
An image processing apparatus comprising: image signal generating means for generating an image signal; discriminating means for discriminating characteristics of the image signal generated by said image signal generating means; and pulse width modulated signal generating means for processing the image signal, generated by said image signal generating means by using a pattern signal and outputting a pulse width modulated signal; wherein said pulse width modulated signal generating means comprises pattern signal generating means capable of generating first and second pattern signals having different periods, and selecting means for selecting one of the first and second signals in accordance with a discrimination result of said discriminating means.
Claim 9
Dependent Claim
38 words
An apparatus according to claim 6 wherein said pulse width modulated signal generating means comprises comparing means for comparing the image signal with the pattern signal selected by said selecting means and generating the pulse width modulated signal.
Claim 10
Dependent Claim
50 words
An apparatus according to claim 7 wherein said pattern signal generating means comprises clock signal generating means for generating first and second clock signals having different periods for forming the first and second pattern signals, said selecting means being adapted to select one of the first and second clock signals.
Claim 11
Independent Claim
35 words
An apparatus according to any preceding claim, wherein said discriminating means comprises edge detecting means for discriminating whether the image signal generated by said image signal generating means corresponds to an edge of an image.
Claim 12
Dependent Claim
87 words
An image processing apparatus comprising: image signal generating means for generating an image signal; edge detecting means for discriminating whether the image signal generated by said image signal generating means corresponds to an edge of an image; smoothing means for smoothing the image signal generated by said image signal generating means and outputting a smoothed signal; and reproduced signal output means for selecting the smoothed signal in accordance with a discrimination result of said edge detecting means and processing the smoothed signal to output a reproduction signal.
Claim 13
Dependent Claim
87 words
An image processing apparatus comprising: image signal generating means for generating an image signal; edge detecting means for discriminating whether the image signal generated by said image signal generating means corresponds to an edge of an image; smoothing means for smoothing the image signal generated by said image signal generating means and outputting a smoothed signal; and reproduced signal output means for selecting the smoothed signal in accordance with a discrimination result of said edge detecting means and processing the smoothed signal to output a reproduction signal.
Claim 14
Dependent Claim
55 words
An apparatus according to claim 10 wherein said reproduction signal output means comprises selecting means for selecting one of the smoothed signal and the image signal according to the discrimination result of said edge detecting means and reproduction signal output unit for processing the signal selected by said selecting means and outputting the reproduction signal.
Claim 15
Dependent Claim
32 words
An apparatus according to claim 11, wherein said reproduction signal output unit uses the pattern signal to process the signal selected by said selecting means and outputs the pulse width modulated signal.
Claim 16
Dependent Claim
116 words
An image processing apparatus comprising: image signal generating means for generating an image signal; image type recognizing means for recognizing the type of image represented by the image signal generated by said image signal generating means; smoothing means for smoothing the image signal generated by said image signal generating means and outputting a smoothed signal; high frequency area emphasizing means for emphasizing a high frequency area of the image signal generated by said image signal generating means and outputting a high frequency area emphasized signal; and selecting means for selecting one of the smoothed signal and the high frequency area emphasized signal in accordance with an image type recognition result of said image type recognizing means.
Claim 17
Dependent Claim
116 words
An image processing apparatus comprising: image signal generating means for generating an image signal; image type recognizing means for recognizing the type of image represented by the image signal generated by said image signal generating means; smoothing means for smoothing the image signal generated by said image signal generating means and outputting a smoothed signal; high frequency area emphasizing means for emphasizing a high frequency area of the image signal generated by said image signal generating means and outputting a high frequency area emphasized signal; and selecting means for selecting one of the smoothed signal and the high frequency area emphasized signal in accordance with an image type recognition result of said image type recognizing means.
Claim 18
Dependent Claim
35 words
An apparatus according to claim 13, further comprising pulse width modulated signal output means for processing the signal selected by said selecting means by using the pattern signal for outputting the pulse width modulated signal.
Claim 19
Dependent Claim
38 words
An apparatus according to claim 13 or 14, wherein said image type recognition means comprises edge detecting means for discriminating whether the image signal generated by said image signal generating means corresponds to an edge of an image.
Claim 20
Independent Claim
15 words
An apparatus according to any preceding claim, wherein the pattern signal is a triangular wave.
Claim 21
Dependent Claim
50 words
An image processing apparatus comprising: means to process a received image signal according to at least two different modes; means for discriminating at least one characteristic of the received image signal; and means for selecting a signal processed according to one of the modes in dependence upon the discrimination result.
Claim 22
Dependent Claim
50 words
An image processing apparatus comprising: means to process a received image signal according to at least two different modes; means for discriminating at least one characteristic of the received image signal; and means for selecting a signal processed according to one of the modes in dependence upon the discrimination result.
References Cited (Backward Citations)
US4040094A
Cited
US4194221A
Cited
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