Calibration techniques for imaging devices
First Claim
1. A method of calibrating a cathode ray tube comprising:
- initializing a lookup table (LUT);
adjusting settings of the cathode ray tube to substantially achieve a defined output;
measuring output for a number of color values;
choosing adjustable parameter values for a device model, wherein a number of adjustable parameters is less than a number of measured outputs;
generating entries for the LUT based on the device model;
wherein measuring output includes displaying a substantially white trace during measurement to bias an output measurement; and
wherein the trace has a halo shape.
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Abstract
The invention is directed to various calibration techniques for calibrating an imagining device such as a display device, a printer, or a scanner. The techniques may involve characterizing the imaging device with a device model such that an average error between expected outputs determined from the device model and measured outputs of the imaging device is on the order of an expected error, and adjusting image rendering on the imaging device to achieve a target behavior. The invention can achieve a balance between analytical behavior of the imaging device and measured output. In this manner, adjustments to image rendering may be more likely to improve color accuracy and less likely to overcompensate for errors that are expected.
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Citations
8 Claims
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1. A method of calibrating a cathode ray tube comprising:
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initializing a lookup table (LUT); adjusting settings of the cathode ray tube to substantially achieve a defined output; measuring output for a number of color values; choosing adjustable parameter values for a device model, wherein a number of adjustable parameters is less than a number of measured outputs; generating entries for the LUT based on the device model; wherein measuring output includes displaying a substantially white trace during measurement to bias an output measurement; and wherein the trace has a halo shape.
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2. A method for calibrating display devices comprising:
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measuring output light generated from red, green, blue (RGB) values on the display device using a color measurement device; displaying a substantially white trace during measurement in order to bias the magnitude of light output by the display device when measured by the color measurement device; wherein the white trace has a halo shape; and calibrating the display device using the white trace. - View Dependent Claims (3, 4)
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5. A computer readable medium storing program code that when executed calibrates a cathode ray tube by:
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initializing a lookup table (LUT); adjusting settings of the cathode ray tube to substantially achieve a defined output; measuring output for a number of color values; choosing adjustable parameter values for a device model, wherein a number of adjustable parameters is less than a number of measured outputs; generating entries for the LUT based on the device model; wherein measuring output includes displaying a substantially white trace during measurement to bias an output measurement; and wherein the trace has a halo shape.
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6. A computer readable medium storing program code for calibrating display devices that when executed:
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measures output light generated from red, green, blue (RGB) values on the display device using a color measurement device; displays a substantially white trace during measurement in order to bias the magnitude of light output by the display device when measured by the color measurement device; wherein the trace has a halo shape; and calibrating the display device using the white trace. - View Dependent Claims (7, 8)
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Specification