EP0267805A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image reading apparatus
Assignee: Canon Inc
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Filing: 1987-11-13
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Granted: —
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Expires: 2007-11-13
Abstract
Abstract A color film reading apparatus of this invention has holding means for holding a color negative film therein; illuminating means for projecting illumination light onto the color negative film; reading means for reading image data from the color negative film; shading correcting means for performing shading correction; and controlling means for controlling the reading means to cause the reading means to read data relative to an unexposed portion of the color negative film to thereby obtain shading correction data for the shading correcting means. The apparatus is capable of generating high-gradation color signals from either of color negative and positive films. This invention further provides an image forming apparatus capable of producing a high-gradation image from either of a film-type original document or a reflection-type original document.
Inventors
- 👤 Kenichi Outa
- 👤 Yasumichi Suzuki
- 👤 Yoshinori Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:07
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N1/40056; H04N1/401; H04N1/405; H04N1/4055; H04N1/4056; H04N1/4076
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
81 words
A color film reading apparatus comprising: holding means for holding a color negative film therein; illuminating means for projecting illumination light onto said color negative film; reading means for reading image data from said color negative film; shading correcting means for performing shading correction; and controlling means for controlling said reading means to cause said reading means to read data relative to an unexposed portion of said color negative film to thereby obtain shading correction data for said shading correcting means.
Claim 2
Dependent Claim
81 words
A color film reading apparatus comprising: holding means for holding a color negative film therein; illuminating means for projecting illumination light onto said color negative film; reading means for reading image data from said color negative film; shading correcting means for performing shading correction; and controlling means for controlling said reading means to cause said reading means to read data relative to an unexposed portion of said color negative film to thereby obtain shading correction data for said shading correcting means.
Claim 3
Dependent Claim
47 words
A color film reading apparatus according to Claim 1, wherein said shading data is obtained by the steps of loading said unexposed portion into said holding means, illuminating said unexposed portion by said illuminating means, and reading data relative to said unexposed portion into said reading means.
Claim 4
Dependent Claim
32 words
A color film reading apparatus according to Claim 1 further comprising controlling means for controlling the quantity of light projected from said illuminating means in accordance with the sensitivity of each film.
Claim 5
Dependent Claim
104 words
A film reading apparatus comprising: setting means for setting the kind of film; holding means for holding said film therein; illuminating means for projecting illumination light onto said film; reading means for reading image data from said film; and controlling means for setting parameters used for an image processing, said controlling means setting said parameters on the basis of said image data read from an unexposed portion of said film in a case where said film is a negative film while in the case of a positive film said controlling means sets said parameters on the basis of data obtained from said illumination light.
Claim 6
Dependent Claim
104 words
A film reading apparatus comprising: setting means for setting the kind of film; holding means for holding said film therein; illuminating means for projecting illumination light onto said film; reading means for reading image data from said film; and controlling means for setting parameters used for an image processing, said controlling means setting said parameters on the basis of said image data read from an unexposed portion of said film in a case where said film is a negative film while in the case of a positive film said controlling means sets said parameters on the basis of data obtained from said illumination light.
Claim 7
Dependent Claim
22 words
A film reading apparatus according to Claim 4, wherein said parameters for the projection of said image processing is shading correction data.
Claim 8
Dependent Claim
32 words
A film reading apparatus according to Claim 4, further comprising light controlling means for controlling the quantity of light emitted from said illuminating means in accordance with the kind of each film.
Claim 9
Dependent Claim
30 words
A film reading apparatus according to Claim 6, wherein said light controlling means causes said quantity of light to vary in accordance with the sensitivity of a color negative film.
Claim 10
Dependent Claim
89 words
A film reading apparatus comprising: setting means for setting the kind of film; holding means for holding said film; illuminating means for projecting illumination light onto said film; reading means for reading image data from said film; detecting means for detecting from the output of said reading means the lightness characteristics of said image data of said film; and controlling means for causing the quantity of light emitted from said illuminating means to vary in accordance with the detection output of said detecting means and said kind of film.
Claim 11
Dependent Claim
89 words
A film reading apparatus comprising: setting means for setting the kind of film; holding means for holding said film; illuminating means for projecting illumination light onto said film; reading means for reading image data from said film; detecting means for detecting from the output of said reading means the lightness characteristics of said image data of said film; and controlling means for causing the quantity of light emitted from said illuminating means to vary in accordance with the detection output of said detecting means and said kind of film.
Claim 12
Dependent Claim
45 words
A film reading apparatus according to Claim 8, wherein, in a case where said kind of film is a positive film, said controlling means sets said quantity of light on the basis of the maximum value of said lightness characteristics detected by said detecting means.
Claim 13
Dependent Claim
45 words
A film reading apparatus according to Claim 8, wherein, in a case where said kind of film is a negative film, said controlling means sets said quantity of light on the basis of the minimum value of said light characteristics detected by said detecting means.
Claim 14
Dependent Claim
33 words
A film reading apparatus according to Claim 8, wherein said controlling means controls said quantity of light by varying the level of a drive voltage of an illuminating lamp of said illuminating means.
Claim 15
Dependent Claim
98 words
A color film reading apparatus comprising: illuminating means for projecting illumination light onto a color film; photoelectric conversion means for receiving said illumination light to convert said illumination light into an electrical signal; and shading correction means for effecting shading correction of said photoelectric conversion means, wherein, in the case of a color negative film, said correction data for said shading correction means is obtained employing said illumination light projected onto an unexposed portion of said color negative film while, in the case of a color positive film, said correction data is obtained directly employing said illumination light.
Claim 16
Dependent Claim
98 words
A color film reading apparatus comprising: illuminating means for projecting illumination light onto a color film; photoelectric conversion means for receiving said illumination light to convert said illumination light into an electrical signal; and shading correction means for effecting shading correction of said photoelectric conversion means, wherein, in the case of a color negative film, said correction data for said shading correction means is obtained employing said illumination light projected onto an unexposed portion of said color negative film while, in the case of a color positive film, said correction data is obtained directly employing said illumination light.
Claim 17
Dependent Claim
41 words
A color film reading apparatus according to Claim 12 further comprising means for causing said quantity of light emitted from said illuminating means to vary in accordance with whether the kind of film is a negative film or a positive film.
Claim 18
Dependent Claim
33 words
A color film reading apparatus according to Claim 12 further comprising means for causing said quantity of light emitted from said illuminating means to vary in accordance with the sensitivity of said film.
Claim 19
Dependent Claim
93 words
An image forming apparatus comprising: exposure means for exposing a reflection-type original document; projecting means for projecting a film-type original document; reading means for reading image signals from said reflection-type original document and said film-type original document; image forming means for forming a reproduced image in accordance with said image signals; and controlling means for controlling the gradation of an image formed by said image forming means, wherein said controlling means controls said image forming means so that said gradation may increase while an image is being formed from said film-type original document.
Claim 20
Dependent Claim
93 words
An image forming apparatus comprising: exposure means for exposing a reflection-type original document; projecting means for projecting a film-type original document; reading means for reading image signals from said reflection-type original document and said film-type original document; image forming means for forming a reproduced image in accordance with said image signals; and controlling means for controlling the gradation of an image formed by said image forming means, wherein said controlling means controls said image forming means so that said gradation may increase while an image is being formed from said film-type original document.
Claim 21
Dependent Claim
66 words
An image forming apparatus according to Claim 15, wherein said image forming means represents a half tone by modulating the pulse width of a recording signal in accordance with the level of said image signal, said controlling means modulating said pulse width over a wider range during image formation employing said film-type original document than a modulation range during image formation employing said reflection-type original document.
Claim 22
Dependent Claim
72 words
An image forming apparatus according to Claim 16, wherein said image forming means includes a triangle-wave generating circuit for generating a plurality of triangle waves each having a different period and a comparator circuit for comparing the level of said triangle wave with the level of said image signal, said controlling means selecting a triangle wave having the longest period from said triangle waves during image formation employing said film-type original document.
Claim 23
Independent Claim
49 words
A method of adjusting a color film reading apparatus which projects light from a color negative film onto a reading means and provides an output signal, the method including reading an unexposed portion of the film and adjusting the sensitivity of the apparatus in dependence upon the output obtained.
Claim 24
Independent Claim
49 words
A method of adjusting a color film reading apparatus which projects light from a color negative film onto a reading means and provides an output signal, the method including reading an unexposed portion of the film and adjusting the sensitivity of the apparatus in dependence upon the output obtained.
References Cited (Backward Citations)
US4833532A
Cited
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