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EP0680199A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Image processing apparatus and method

Assignee: Canon Inc
•
Filing: 1995-04-25
•
Granted: —
•
Expires: 2015-04-25
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Abstract

Abstract An object of the present invention is to sufficiently show the effects of color correction in view of the characteristic of an output device even if an image processing setting of the output device is changed, and to always obtain the optimal output image even if the characteristic of the output device changes. In order to achieve the above object, a color chart is output from an image output based on data generated in an image processing apparatus, and a color correction parameter best-suited to color correction in view of the type and characteristic of an output device is generated in a color correction parameter generator based on data obtained by reading the color chart from a reader, and stored in a storage. A device setting value at the output of the color chart is stored in another storage. In image output, a color corrector and an image processor are automatically adjusted to be best-suited to color correction by using a pair of the stored color correction parameter and the stored device setting value, and then, color correction and image processing are carried out.

Inventors

  • 👤 Hiroshi Mori

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 12:22
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/603; H04N1/6033

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 72 words
An image processing apparatus, comprising: color correction means for making color correction to color image information by using a color correction parameter in accordance with a device setting condition and characteristic of an output device; image processing means for performing predetermined image processing according to the device setting condition of said output device; and storage means for storing the device setting condition and the color correction parameter in relation to each other.
Claim 2
Dependent Claim 18 words
An image processing apparatus according to claim 1, wherein a gradation correction is made in the color correction.
Claim 3
Dependent Claim 18 words
An image processing apparatus according to claim 1, wherein a matrix computation is performed in the color correction.
Claim 4
Dependent Claim 15 words
An image processing apparatus according to claim 1, wherein said image processing means performs binarization.
Claim 5
Dependent Claim 17 words
An image processing apparatus according to claim 4, wherein the device setting condition sets a dither pattern.
Claim 6
Dependent Claim 18 words
An image processing apparatus according to claim 4, wherein the binarization is performed by the error diffusion method.
Claim 7
Dependent Claim 23 words
An image processing apparatus according to claim 1, wherein the device setting condition sets either a single color mode or a full-color mode.
Claim 8
Dependent Claim 24 words
An image processing apparatus according to claim 1, wherein the device setting condition sets either a three-color recording mode or a four-color recording mode.
Claim 9
Dependent Claim 105 words
An image processing apparatus for generating color correction data to be used in an image output apparatus having color correction means for making color correction to input image data based on an output characteristic of an image output device and the color correction data, and image processing means for performing image processing according to a set mode, said image processing apparatus, comprising: input means for inputting color image data representing a color chart subjected to image processing in a predetermined mode in said image processing apparatus; and generating means for generating color correction data corresponding to the predetermined mode based on the color image data.
Claim 10
Dependent Claim 24 words
An image processing apparatus according to claim 9, further comprising: storage means for storing the color correction data in correspondence with the predetermined mode.
Claim 11
Dependent Claim 65 words
An image processing method, comprising the steps of: making color correction to color image information by using a color correction parameter in accordance with a characteristic and a device setting condition of an output device; performing predetermined image processing according to the device setting condition of said output device; and storing the device setting condition and the color correction parameter in relation to each other.
Claim 12
Dependent Claim 102 words
An image processing method for generating color correction data to be used in an image output apparatus having color correction means for making color correction to input image data based on an output characteristic of an image output device and the color correction data, and image processing means for performing image processing according to a set mode, said image processing method, comprising the steps of: inputting color image data representing a color chart subjected to image processing in a predetermined mode in said image processing apparatus; and generating color correction data corresponding to the predetermined mode based on the color image data.
Claim 13
Dependent Claim 23 words
An image processing apparatus or method in which a color correction parameter is related to a device setting condition for an output device.
Claim 14
Dependent Claim 40 words
An image processing apparatus or method in which a stored color chart is output by an output device and the stored color chart is compared with the output color chart to derive a color correction parameter for the output device.

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