Display calibration method and apparatus for exposing errors in gamma mapping and image scaling
AssigneePixar
InventorsRick Sayre, Rod Bogart
Life of this patent
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Abstract
Test patterns and associated techniques for testing the fidelity of intensity reproduction are disclosed. One set of embodiments provide test patterns that incorporate anti-aliased features such as anti-aliased edges or lines. In various embodiments, these anti-aliased features expose undesirable, nonlinear transformations of the test patterns by one or more devices in an image output system or chain. Using these test patterns, users may more easily evaluate the end-to-end gamma response of the system, and may more easily calibrate gamma controls accordingly. Additionally, users may more easily identify nonlinear image resampling performed in gamma, rather than linear, space.
Claims42
A method for testing the fidelity of intensity reproduction in an image output system comprising an image output device and one or more other devices, the method comprising:
- receiving a representation of a test pattern, wherein the test pattern includes a plurality of anti-aliased features, and wherein the plurality of anti-aliased features are configured to provide visual evidence of a nonlinear transformation of the test pattern by the image output device or the one or more other devices, wherein the visual evidence includes an artifact that is formed from the placement of at least two of the plurality of anti-aliased features.
A method for testing the fidelity of intensity reproduction in an image output system comprising an image output device and one or more other devices, the method comprising:
- receiving a representation of a test pattern, wherein the test pattern is configured to exhibit low-frequency artifacts across an output area of the image output device in response to an nonlinear transformation of the test pattern by the image output device or the one or more other devices, wherein the low-frequency artifacts result from visual interactions due to placement of elements of the test pattern.
An apparatus for testing the fidelity of intensity reproduction in an image output system comprising an image output device and one or more other devices, the apparatus comprising:
- a processing component configured to generate a representation of a test pattern, wherein the test pattern includes a plurality of anti-aliased features, and wherein the plurality of anti-aliased features are configured to provide visual evidence of a nonlinear transformation of the test pattern by the image output device or the one or more other devices, wherein the visual evidence includes an artifact formed from the placement of at least two of the plurality of anti-aliased features.
A non-transitory machine-readable medium, the non-transitory machine-readable medium having stored thereon a representation of a test pattern, wherein the test pattern is configured to be outputted by an image output system comprising an image output device and one or more other devices, wherein the test pattern includes a plurality of anti-aliased features, and wherein the plurality of anti-aliased features are configured to provide visual evidence of a nonlinear transformation of the test pattern by the image output device or the one or more other devices, wherein the visual evidence includes an artifact formed from the placement of at least two of the plurality of anti-aliased features.
Dependencies are inferred from the claim text.