EP0438316A2
Expired / Lapsed
EP
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Image data processing apparatus
Assignee: Sharp Corp
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Filing: 1991-01-18
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Granted: —
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Expires: 2011-01-18
Abstract
Abstract An image data processing apparatus is provided for crisply reading a dark portion on an original. The image data processing apparatus includes a light source (11) for applying a light ray to an original, a CCD sensor (12) for receiving a light reflected by the original, converting the light into an electric signal and storing the electric signal, an analog processing circuit (13) for receiving the electric signal from the CCD sensor and correcting the DC level of the electric signal, an analog-to-digital converter (14) for receiving a corrected electric signal from the analog processing circuit and converting the corrected electric signal into a digital signal, a digital processing circuit (15) for reading the digital signal from the analog-to-digital converter two or more times and adding the digital signal into one output signal, and a control section (17) for controlling the CCD sensor, the analog processing circuit, the analog-to-digital converter and the digital processing circuit.
Inventors
- 👤 Fumikazu Nagano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 10:54
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056; H04N25/00; H04N25/70; H04N25/701; H04N25/71; H04N25/745
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
58 words
An image data processing apparatus comprising: means for applying a light ray to an original; a CCD sensor for converting the light ray reflected by said original into an electric signal and storing said electric signal; and an adder for receiving said stored electric signal two or more times and adding said read signals received at each time.
Claim 2
Dependent Claim
28 words
An image data processing apparatus according to claim 1, wherein said CCD sensor includes a sensor section, a transfer gate, an analog shift register and an output buffer
Claim 3
Dependent Claim
33 words
An image data processing apparatus according to claim 2, wherein said sensor section, said transfer gate and said analog shift register are respectively divided into N units, each unit matching to one pixel.
Claim 4
Dependent Claim
16 words
An image data processing apparatus according to claim 1, said apparatus being applied to a scanner.
Claim 5
Dependent Claim
16 words
An image data processing apparatus according to claim 1, said apparatus being applied to a copier.
Claim 6
Dependent Claim
16 words
An image data processing apparatus according to claim 1, said apparatus being applied to a facsimile.
Claim 7
Dependent Claim
133 words
An image data processing apparatus comprising: a light source for applying a light ray to an original; a CCD sensor for receiving a light reflected by said original, converting said light into an electric signal and storing said electric signal; an analog processing circuit for receiving said electric signal from said CCD sensor and correcting the DC level of said electric signal; an analog-to-digital converter for receiving a corrected electric signal from said analog processing circuit and converting said corrected electric signal into a digital signal; a digital processing circuit for reading said digital signal from said analog-to-digital converter two or more times and adding said digital signal into one output signal; and a control section for controlling said CCD sensor, said analog processing circuit, said analog-to-digital converter and said digital processing circuit.
Claim 8
Dependent Claim
17 words
An image data processing apparatus according to claim 7, wherein said digital processing circuit includes an adder.
Claim 9
Dependent Claim
28 words
An image data processing apparatus according to claim 7, wherein said CCD sensor includes a sensor section, a transfer gate, an analog shift register and an output buffer.
Claim 10
Dependent Claim
33 words
An image data processing apparatus according to claim 9, wherein said sensor section, said transfer gate and said analog shift register are respectively divided into N units, each unit matching to one pixel.
Claim 11
Dependent Claim
57 words
An image data processing apparatus according to claim 7, wherein said analog processing circuit includes a first MOS transistor served as an analog switch, a first voltage follower, a capacitor, a second voltage follower and a second MOS transistor connected to a four-voltage supply, said second voltage follower and said second MOS transistor composing a clamp circuit.
Claim 12
Dependent Claim
107 words
An image data processing apparatus according to claim 7, wherein said digital processing circuit includes a buffer, an adder, a memory and a counter, said buffer functioning as inputting signals sent from said analog-to-digital converter into said memory depending on a pulse sent from said control section, said memory for storing and outputting said signals depending on the pulse sent from said control section, said counter specifying an address for said signal stored in said memory, and said adder serving to add the next signals sent from said analog-to-digital converter and the corresponding signals stored in said memory into the output signals and supply said output signals.
Claim 13
Dependent Claim
28 words
An image data processing apparatus according to claim 11, wherein in place of said memory, a delay line is used for delaying signals sent from said analog-to-digital converter.
Claim 14
Dependent Claim
30 words
An image data processing apparatus according to claim 11, wherein in place of said memory, two or more shift registers are used for delaying signals sent from said analog-to-digital converter.
Claim 15
Dependent Claim
16 words
An image data processing apparatus according to claim 7, said apparatus being applied to a scanner.
Claim 16
Dependent Claim
16 words
An image data processing apparatus according to claim 7, said apparatus being applied to a copier.
Claim 17
Dependent Claim
16 words
An image data processing apparatus according to claim 7, said apparatus being applied to a facsimile.
Claim 18
Dependent Claim
114 words
Apparatus for reading an image on a recording surface, comprising means (10,11) for illuminating said recording surface; opto-electric transducer means (12) for receiving image light from the illuminated image, and for generating and storing electrical representations of elements of the image; means (17) for controlling signal read out from the stored representations; and data processing means (13,14,15) for processing the readout signals, characterised in that said controlling means (17) is operable to cause a first main image readout and at least one further residual image readout in respect of each set of stored representations and in that said data processing means is operable to combine the readout signals from said first and further readouts.
References Cited (Backward Citations)
No citation records indexed.
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