21.
    发明专利
    未知

    公开(公告)号:DE68928928T2

    公开(公告)日:1999-07-29

    申请号:DE68928928

    申请日:1989-06-20

    Applicant: CANON KK

    Abstract: The appts. processes a video colour image signal, e.g. derived from a colour document reader, and forms a visual image on an image forming, pref. electrophotography device such as a laser printer, corresp. to the processed signal. The resolution of the image can be changed during its formation. Processing circuitry is included to discriminate a character portion, pref. a black character portion, of an object colour image and change the resolution according to the results of the discrimination. Pref. the resolution is controlled to be higher when a black character portion is discriminated.

    22.
    发明专利
    未知

    公开(公告)号:DE3752252T2

    公开(公告)日:1999-07-29

    申请号:DE3752252

    申请日:1987-11-13

    Applicant: CANON KK

    Abstract: A color image processing apparatus such as a color copying machine has a color appointing device for enabling an operator to appoint any desired color involved in an original image, a color range changing device for manually or automatically changing the size of range of the colors which can be regarded as being the same as the predetermined color, a target color appointing for appointing a color to which the predetermined color is to be converted, and a color image forming device such as a laser beam printer for forming a color image with the predetermined color and colors in the color range converted into the target color.

    25.
    发明专利
    未知

    公开(公告)号:DE3408107C2

    公开(公告)日:1996-05-30

    申请号:DE3408107

    申请日:1984-03-05

    Applicant: CANON KK

    Abstract: A color image reading apparatus having a color sensor with plural sensor groups, the color sensor for separating an objective image into plural color components and for converting the plural color components into plural color component signals, and a shading corrector for performing shading correction for the plural color component signals. The shading corrector causes the plural sensor groups to substantially simultaneously read a reference plate and automatically corrects a shading correction state for each of the plural color component signals in accordance with data obtained from the plural sensor groups.

    FACSIMILE APPARATUS
    28.
    发明专利

    公开(公告)号:GB2145598B

    公开(公告)日:1987-01-28

    申请号:GB8405862

    申请日:1984-03-06

    Applicant: CANON KK

    Abstract: A halftone image recording apparatus includes means for recording an image on a recording medium, inputting an image signal representative of an image which includes a plurality of density levels, generating a plurality of pulsed periodic signals having different widths of one period of the image signal, selecting at least one periodic signal with a preselected pulse width among a plurality of the periodic signals, combining the selected periodic signal with the image signal, and applying the combined signal to the recording means.

    Image-forming device
    29.
    发明专利

    公开(公告)号:DE3341774A1

    公开(公告)日:1984-05-24

    申请号:DE3341774

    申请日:1983-11-18

    Applicant: CANON KK

    Inventor: IKEDA YOSHINORI

    Abstract: An image-forming device has a control unit which controls an image field on a photosensitive drum in accordance with information on the format of an original as detected by means of an original format detector, and in accordance with a magnification/demagnification scale determined by a selected mode of operation for magnification/demagnification. An unused field outside the desired image field is discharged.

    Image reproduction device
    30.
    发明专利

    公开(公告)号:DE3327270A1

    公开(公告)日:1984-02-02

    申请号:DE3327270

    申请日:1983-07-28

    Applicant: CANON KK

    Inventor: IKEDA YOSHINORI

    Abstract: An image reproduction device is specified which has a plurality of recording material containers, a device for generating a plurality of characteristic signals including at least characteristic signals for the plurality of containers, the characteristic signals serving to carry out the image reproduction, a determining device for establishing other characteristics from predetermined characteristic signals of the characteristic signal generating device and an operating device, which permits an arbitrary choice of the other characteristics which is independent of the predetermined characteristic signals.

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