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| Fifty channel television transmitter |
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| Apparatus for reducing artifacts in error diffused images |
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Image processing method and apparatus
| Details |
Inventors: Kumada, Shuichi; Ohga, Manabu;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Luu; Matthew
Assistant Examiner: Sajous; Wesner
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto
When gamut mapping (hue restoration) defined by one Lab color space is applied in color matching under different reference white points, human vision perceives the hue as inconsistent. In view of this, input data which is dependent on a color space of an input device is converted by a first conversion LUT to color space data which is independent of any devices, based on a viewing condition at the time of viewing an input original. The device independent data is converted to data in the human color perception space by a forward converter, subjected to gamut mapping, and converted back to device independent data in the color space independent of any devices by an inverse converter, based on a viewing condition at the time of viewing an output original. Then, the device independent data is converted to output data in a color space which is dependent on an output device by a second conversion LUT. |
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DETAILED DESCRIPTION The present invention is made in consideration of the above situation, and has as its object to provide an image processing method and apparatus for realizing excellent color reproduction regardless of viewing conditions.
Another object of the present invention is to provide an image processing method and apparatus for realizing excellent color reproduction particularly by performing partial adaptation processing.
Furthermore, another object of the present invention is to provide an image processing method and apparatus which enable adjustment of partial adaptation processing so as to adjust chromatic adaptability processing to obtain a result desired by a user.
In order to attain the above objects, the present invention provides an image processing method for performing chromatic adaptability conversion processing on input image data based on a viewing condition, wherein the chromatic adaptability conversion processing performs partial adaptation processing in accordance with ambient light and an illuminant, and at least one parameter of the partial adaptation processing can be adjusted.
Furthermore, in order to attain the above objects, the present invention provides an image processing apparatus comprising conversion means for at least performing chromatic adaptability conversion processing on input image data based on a viewing condition, wherein the chromatic adaptability conversion processing performs partial adaptation processing in accordance with ambient light and an illuminant, and at least one parameter of the partial adaptation processing can be adjusted.
Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.
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Image Analysis 
