Color image display accuracy using comparison of complex shapes to reference background
First Claim
1. A method comprising:
- displaying a sequence of dark elements against a black background, wherein each of the dark elements has a different gray value and a non-rectangular shape;
estimating a blackpoint for a display device based on one of the dark elements selected by the user that is visible and appears to most closely match the background.
3 Assignments
0 Petitions
Accused Products
Abstract
Improved color image display accuracy can be achieved across a computer network by obtaining information characterizing the color response of display devices associated with a client residing on the computer network and using the information to modify color images delivered to the client. The information includes a blackpoint estimate for the display devices. The invention, in one embodiment, makes use of dark elements in the form of non-rectangular shapes such as numerals, letters, and the like to aid in determination of the blackpoint estimate. In particular, rows or columns of complex shapes with varying gray values can be displayed against a black background. The use of complex shapes to determine the blackpoint can help resolve minor differences in R, G, and B that can cause poor gray balance. Instead of patches or bars, which may be generally rectangular, more complex shapes can be used to aid the human eye in resolving such differences. The information can be obtained, for example, by guiding the client through a color profiling process that profiles the color response of the display device. For example, such guidance may take the form of a series of instructional web pages that are delivered to the client. The web pages can be made interactive to enable collection of color characterization data from the client.
80 Citations
37 Claims
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1. A method comprising:
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displaying a sequence of dark elements against a black background, wherein each of the dark elements has a different gray value and a non-rectangular shape;
estimating a blackpoint for a display device based on one of the dark elements selected by the user that is visible and appears to most closely match the background. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system comprising:
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a web server residing on a computer network, the web server transmitting web pages to remote clients residing on the computer network;
a color image server residing on the computer network, the color image server transmitting color images referenced by the web pages to the clients for display on display devices associated with the clients;
a color profile server residing on the computer network, the color profile server guiding the clients through a color profiling process to obtain information characterizing the color responses of the display devices associated with the clients, wherein the information includes a blackpoint estimate for the color channels of the display devices, and the color profiling process includes;
displaying dark elements against a black background, wherein each of the dark elements has a different gray value and a non-rectangular shape, selecting one of the dark elements that is visible and appears to most closely match the black background, and estimating the blackpoint for a display device based on the selected dark element; and
one or more color correction modules that modify the color images transmitted by the color image server based on the information to improve the accuracy of the color images when displayed on the respective display device. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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24. A computer readable medium containing program code that upon execution by a processor:
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displays dark elements against a background, wherein each of the dark elements has a different gray value and a non-rectangular shape;
estimates a blackpoint for a display device based on one of the dark elements selected by the user that is visible and appears to most closely match the background. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification