COLOR CALIBRATION OF COLOR IMAGE RENDERING DEVICES
1 Assignment
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Accused Products
Abstract
Color calibration of color image rendering devices, such as large color displays, which operate by either projection or emission of images, utilize internal color measurement instrument or external color measurement modules locatable on a wall or speaker. A dual use camera is provided for a portable or laptop computer, or a cellular phone, handset, personal digital assistant or other handheld device with a digital camera, in which one of the camera or a display is movable with respect to the other to enable the camera in a first mode to capture images of the display for enabling calibration of the display, and in a second mode for capturing image other than of the display. The displays may represent rendering devices for enabling virtual proofing in a network, or may be part of stand-alone systems and apparatuses for color calibration. Improved calibration is also provided for sensing and correcting for non-uniformities of rendering devices, such as color displays, printer, presses, or other color image rendering device.
7 Citations
25 Claims
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1-22. -22. (canceled)
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23. A method for detecting color differences between a source digital image and a reproduction by a rendering device of said source digital image comprising the steps of:
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measuring spatial non-uniformity of a rendering upon a display surface by said rendering device; rendering upon said display surface a reproduction of said source digital image; capturing a digital image of said reproduction of said source digital image; producing one or more histograms from each of said source digital image and said digital image of said reproduction of said source digital image; and comparing corresponding histograms of said each of said source digital image and said digital image of said reproduction of said source digital image from said producing step to determine color differences not due to said spatial non-uniformity of said rendering.
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24. A method for detecting color differences between a source digital image and a reproduction by a rendering device of said source digital image comprising the steps of:
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measuring spatial non-uniformity of a rendering upon a display surface by said rendering device; rendering upon said display surface a reproduction of said source digital image, wherein said rendering is corrected for said spatial non-uniformity of said rendering measured by said measuring step; capturing a digital image of said reproduction of said source digital image; producing one or more histograms from each of said source digital image and said digital image of said reproduction of said source digital image; and comparing corresponding histograms of said each of said source digital image and said digital image of said reproduction of said source digital image from said producing step to determine color differences.
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25. A method for detecting color differences between a source digital image and a reproduction by a rendering device of said source digital image comprising the steps of:
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measuring spatial non-uniformity of a rendering upon a display surface by said rendering device; rendering upon said display surface a reproduction of said source digital image; capturing a digital image of said reproduction of said source digital image; producing one or more histograms from each of said source digital image and said digital image of said reproduction of said source digital image, in which said one or more histograms produced from said source digital image are modified to represent said spatial non-uniformity of rendering measured by said measuring step; and comparing corresponding histograms of said each of said source digital image and said digital image of said reproduction of said source digital image from said producing step to determine color differences.
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Specification