EP0213949A2
Expired / Lapsed
EP
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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 An image processing apparatus has a semiconductor laser (14) for modulating a light beam (24), a beam detector (5) for detecting the beam, a selector (12) for selecting an output from a digital data input unit (10) or a black signal generator circuit (11), a comparator (14) for pulse-width modulating an output from the selector received through a D/A converter (13), and a signal generator circuit (21) for generating a video enable signal for switching the selector. The black signals are applied through the D/A converter and PWM comparator (14), rather than through an insertion circuit after the comparator, in order to avoid signal degradation caused by such an insertion circuit.
Inventors
- 👤 Hitoshi Arai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:15
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/387; H04N1/3871
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
An image processing apparatus comprising: means for modulating an image signal according to pulse width modulation; means for performing optical modulation in response to the pulse width modulated signal from said pulse width modulating means; means for generating a predetermined pattern signal; and intervention means for supplying the pattern signal to said optical modulating means through said pulse width modulating means.
Claim 2
Dependent Claim
61 words
An image processing apparatus comprising: means for modulating an image signal according to pulse width modulation; means for performing optical modulation in response to the pulse width modulated signal from said pulse width modulating means; means for generating a predetermined pattern signal; and intervention means for supplying the pattern signal to said optical modulating means through said pulse width modulating means.
Claim 3
Dependent Claim
52 words
An image processing apparatus comprising: means for binarizing an image signal; beam generating means; means for generating a predetermined signal so as to generate a beam representing a predetermined density; and intervention means for supplying the signal from said predetermined signal generating means to said beam generating means through said binarizing means.
Claim 4
Dependent Claim
52 words
An image processing apparatus comprising: means for binarizing an image signal; beam generating means; means for generating a predetermined signal so as to generate a beam representing a predetermined density; and intervention means for supplying the signal from said predetermined signal generating means to said beam generating means through said binarizing means.
Claim 5
Dependent Claim
54 words
An image processing apparatus comprising: process means for processing an image sinnal according to a plurality of gray scale levels; means for forming an image according to a signal processed by said process means and pattern signal generating means; wherein said pattern signal generating means is connected to an input of said processing means.
Claim 6
Dependent Claim
54 words
An image processing apparatus comprising: process means for processing an image sinnal according to a plurality of gray scale levels; means for forming an image according to a signal processed by said process means and pattern signal generating means; wherein said pattern signal generating means is connected to an input of said processing means.
Claim 7
Dependent Claim
57 words
An image processing apparatus comprising: means (13,14,15) for binarizing image data and modulating an optical output (24) in accordance with the binarized data; means for producing a predetermined optical output; and means (5) for detecting the predetermined optical output for synchronization purposes; characterized in that the binarizing means (13,14,15) is used in producing the predetermined optical output.
Claim 8
Dependent Claim
57 words
An image processing apparatus comprising: means (13,14,15) for binarizing image data and modulating an optical output (24) in accordance with the binarized data; means for producing a predetermined optical output; and means (5) for detecting the predetermined optical output for synchronization purposes; characterized in that the binarizing means (13,14,15) is used in producing the predetermined optical output.
References Cited (Backward Citations)
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