Method of determining display characteristic function
First Claim
Patent Images
1. A method of determining a display characteristic function of a display, the method comprising the steps of:
- initially setting at least one assumption on a display characteristic function of a display, the display characteristic function being indicative of a relationship between an input level of image data to be inputted to the display and relative brightness of an image to be displayed on the display by the image data;
controlling the display to display at least one test image based on the set at least one assumption, each of the at least one test image including a plurality of first gradation patterns and a plurality of second gradation patterns, brightness of each first gradation pattern changing from a predetermined first value to a predetermined second value in one direction in a manner determined by a corresponding assumption, brightness of each second gradation pattern changing from the predetermined first value to the predetermined second value in a reverse direction in the manner determined by a corresponding assumption, the first and second gradation patterns being arranged alternately in the test image so that portions of a second brightness in the first gradation patterns are arranged adjacent to portions of a first brightness in the second gradation patterns;
selecting one test image whose brightness appears uniform; and
determining the display characteristic function of the display based on the assumption that provides the selected test image.
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Abstract
A test image 40 for determining a gamma value has a plurality of first gradation patterns 20 and a plurality of second gradation patterns 30. The patterns 20 and 30 are arranged alternately in a vertical direction. In each pattern 20, a relative brightness linearly increases from left to right. In each pattern 30, a relative brightness linearly decreases from left to right.
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Citations
41 Claims
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1. A method of determining a display characteristic function of a display, the method comprising the steps of:
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initially setting at least one assumption on a display characteristic function of a display, the display characteristic function being indicative of a relationship between an input level of image data to be inputted to the display and relative brightness of an image to be displayed on the display by the image data; controlling the display to display at least one test image based on the set at least one assumption, each of the at least one test image including a plurality of first gradation patterns and a plurality of second gradation patterns, brightness of each first gradation pattern changing from a predetermined first value to a predetermined second value in one direction in a manner determined by a corresponding assumption, brightness of each second gradation pattern changing from the predetermined first value to the predetermined second value in a reverse direction in the manner determined by a corresponding assumption, the first and second gradation patterns being arranged alternately in the test image so that portions of a second brightness in the first gradation patterns are arranged adjacent to portions of a first brightness in the second gradation patterns; selecting one test image whose brightness appears uniform; and determining the display characteristic function of the display based on the assumption that provides the selected test image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device for determining a display characteristic function of a display, the device comprising:
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means for initially setting at least one assumption on a display characteristic function of a display, the display characteristic function being indicative of a relationship between an input level of image data to be inputted to the display and relative brightness of an image to be displayed on the display by the image data; means for controlling the display to display at least one test image based on the set at least one assumption, each of the at least one test image including a plurality of first gradation patterns and a plurality of second gradation patterns, brightness of each first gradation pattern changing from a predetermined first value to a predetermined second value in one direction in a manner determined by a corresponding assumption, brightness of each second gradation pattern changing from the predetermined first value to the predetermined second value in a reverse direction in the manner determined by a corresponding assumption, the first and second gradation patterns being arranged alternately in the test image so that portions of a second brightness in the first gradation patterns are arranged adjacent to portions of a first brightness in the second gradation patterns; means for selecting one test image whose brightness appears uniform; and means for determining the display characteristic function of the display based on the assumption that provides the selected test image and for storing the determined display characteristic function. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A printer system, comprising:
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a display having a display characteristic function indicative of a relationship between an input level of image data to be inputted to the display and relative brightness of an image to be displayed on the display by the image data; a printer having print control means for performing a printing operation with image data inputted thereto; a device for determining the display characteristic of the display, the device including; means for initially setting at least one assumption on the display characteristic function of the display; means for controlling the display to display at least one test image based on the set at least one assumption, each of the at least one test image including a plurality of first gradation patterns and a plurality of second gradation patterns, brightness of each first gradation pattern changing from a predetermined first value to a predetermined second value in one direction in a manner determined by a corresponding assumption, brightness of each second gradation pattern changing from the predetermined first value to the predetermined second value in a reverse direction in the manner determined by a corresponding assumption, the first and second gradation patterns being arranged alternately in the test image so that portions of a second brightness in the first gradation patterns are arranged adjacent to portions of a first brightness in the second gradation patterns; means for selecting one test image whose brightness appears uniform; and means for determining the display characteristic function of the display based on the assumption that provides the selected test image and for storing the determined display characteristic function; and a printer input data correction device for correcting an input level of image data for being inputted to the print control means based on the display characteristic function stored in the display characteristic function determining and storing means, thereby controlling the printer to print an image consistent with the image displayed on the display.
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34. A device for determining a gamma value, the device comprising:
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means for assuming a gamma value indicative of a display characteristic of a display; means for instructing change of the assumed gamma value; means for controlling the display to display a test image according to the gamma value presently assumed by the assuming means and by the instructing means, the test image including a plurality of first rasters and a plurality of second rasters, brightness of each first raster increasing from a predetermined first value to a predetermined second value from left to right, brightness of each second raster increasing from the predetermined first value to the predetermined second value from right to the left, the first and second rasters being arranged alternately so that portions having a second brightness of the first rasters are arranged adjacent to a portions having the first brightness of the second rasters; means for enabling a user to input a determination instruction to determine a gamma value of the display when the test image appears entirely uniform; and means for storing, as the gamma value for the display, the gamma value presently assumed when the determining instruction is inputted. - View Dependent Claims (35, 36)
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37. A printer system, comprising:
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a display with a gamma value; a printer having print control means for performing a printing operation with image data inputted thereto; a device for determining a gamma value of the display, the determining device including; means for assuming a gamma value indicative of a display characteristic of a display; means for instructing change of the assumed gamma value; means for controlling the display to display a test image according to the gamma value presently assumed by the assuming means and by the instructing means, the test image including a plurality of first rasters and a plurality of second rasters, brightness of each first raster increasing from a predetermined first value to a predetermined second value from left to right, brightness of each second raster increasing from the predetermined first value to the predetermined second value from right to the left, the first and second rasters being arranged alternately so that portions having a second brightness of the first rasters are arranged adjacent to the portions having a first brightness of the second rasters; means for enabling a user to input a determination instruction to determine a gamma value of the display when the test image appears entirely uniform; and means for storing, as the gamma value for the display, the gamma value presently assumed when the determining instruction is inputted; and printer input data correction means for correcting an input level of image data for being inputted to the print control means based on the gamma value stored in the gamma value storing means, thereby controlling the printer to print an image consistent with the image displayed on the display.
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38. A device for determining a display characteristic function, the device comprising:
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means for setting an assumption for a display characteristic function indicative of a relationship between an input level of image data to be inputted to a display and relative brightness of an image to be displayed on the display with the image data; means for changing the assumption for the display characteristic function; means for controlling the display to display a test image according to a display characteristic function determined based on the assumption, the test image including a plurality of first gradation patterns and a plurality of second gradation patterns, brightness of each first gradation pattern continuously changing from a predetermined minimum value to a predetermined maximum value by every predetermined value in one direction, brightness of each second gradation pattern continuously changing from the predetermined minimum value to the predetermined maximum value by the every predetermined value in a reverse direction, the first and second gradation pattern being arranged alternately so that portions having the maximum brightness in the first gradation patterns are arranged adjacent to portions having the minimum brightness in the second gradation patterns; means for enabling a user to input a determination instruction for determining a display characteristic function for the display when brightness of the test image appears entirely uniform; and means for determining, as a display characteristic function for the display, the display characteristic function determined for the present assumption when the determination instruction is inputted and for storing the determined display characteristic function. - View Dependent Claims (39, 40)
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41. A device for determining a display characteristic function, the device comprising:
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first assumption setting means for setting a first assumption for a display characteristic function indicative of a relationship between an input level of image data to be inputted to a display and relative brightness of an image to be displayed on the display with the image data; second assumption setting means for setting a second assumption which is obtained through changing the first assumption; means for controlling the display to display, on a first image region, a test image according to a display characteristic function determined based on the first assumption, the test image including a plurality of first gradation patterns and a plurality of second gradation patterns, brightness of each first gradation pattern continuously changing from a predetermined minimum value to a predetermined maximum value by every predetermined value in one direction, brightness of each second gradation pattern continuously changing from the predetermined minimum value to the predetermined maximum value by the every predetermined value in a reverse direction, the first and second gradation patterns being arranged alternately so that portions having the maximum brightness in the first gradation patterns are arranged adjacent to portions having the minimum brightness in the second gradation patterns, and for simultaneously controlling the display to display, on a second image region, another test image according to the display characteristic function determined based on the second assumption; means for selecting a test image which appears more uniform than the other; and means for determining, as a display characteristic function for the display, the display characteristic function determined based on an assumption that provides the selected test image and for storing the determined display characteristic function.
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Specification