Image format conversion using luminance-adaptive dithering
AssigneeAT&T Intellectual Property I, L.P.
InventorPeshala Pahalawatta
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Abstract
In one example, the present disclosure describes a device, computer-readable medium, and method for image format conversion using luminance-adaptive dithering. For instance, in one example, a method includes acquiring an image in a first format, wherein the first format is associated with a first electro-optical transfer function, identifying a second format to which to convert the image, wherein the second format is associated with a second electro-optical transfer function, and applying dithering to the image in the second format, based on an evaluation of a luminance-dependent metric against a predefined threshold, wherein the luminance-dependent metric is computed from at least one of the first electro-optical transfer function and the second electro-optical transfer function.
Claims20
A method, comprising:
- acquiring, by a processing system including at least one processor, an image in a first format, wherein the first format is associated with a first electro-optical transfer function;
- identifying, by the processing system, a second format to which to convert the image, wherein the second format is associated with a second electro-optical transfer function, and wherein the second format is a scene-referred format;
- computing, by the processing system, an inverse of an opto-electronic transfer function of the scene-referred format;
- computing, by the processing system, an opto-optical transfer function from a display parameter of a display device on which the image in the second format is to be displayed;
- deriving, by the processing system, the second electro-optical transfer function as a function of the inverse of the opto-electronic transfer function and the opto-optical transfer function;
- and
- applying, by the processing system, dithering to the image in the second format, based on an evaluation of at least a first luminance-dependent metric against a first predefined threshold that indicates the dithering is to be applied, wherein the first luminance-dependent metric is a luminance-dependent precision based on a surround luminance of a second pixel of the image in the second format and is computed from the second electro-optical transfer function, wherein the first predefined threshold is based on a luminance-dependent just noticeable difference metric.
A device, comprising:
- a processing system including at least one processor;
- and
- a computer-readable medium storing instructions which, when executed by the processing system, cause the processing system to perform operations, the operations comprising:
- acquiring an image in a first format, wherein the first format is associated with a first electro-optical transfer function;
- identifying a second format to which to convert the image, wherein the second format is associated with a second electro-optical transfer function, and wherein the second format is a scene-referred format;
- computing an inverse of an opto-electronic transfer function of the scene-referred format;
- computing an opto-optical transfer function from a display parameter of a display device on which the image in the second format is to be displayed;
- deriving the second electro-optical transfer function as a function of the inverse of the opto-electronic transfer function and the opto-optical transfer function;
- and
- applying dithering to the image in the second format, based on an evaluation of at least a first luminance-dependent metric against a first predefined threshold that indicates the dithering is to be applied, wherein the first luminance-dependent metric is a luminance-dependent precision based on a surround luminance of a second pixel of the image in the second format and is computed from the second electro-optical transfer function, wherein the first predefined threshold is based on a luminance-dependent just noticeable difference metric.
A non-transitory computer-readable medium storing instructions which, when executed by a processing system including at least one processor, cause the processing system to perform operations, the operations comprising:
- acquiring an image in a first format, wherein the first format is associated with a first electro-optical transfer function;
- identifying a second format to which to convert the image, wherein the second format is associated with a second electro-optical transfer function, and wherein the second format is a scene-referred format;
- computing an inverse of an opto-electronic transfer function of the scene-referred format;
- computing an opto-optical transfer function from a display parameter of a display device on which the image in the second format is to be displayed;
- deriving the second electro-optical transfer function as a function of the inverse of the opto-electronic transfer function and the opto-optical transfer function;
- and
- applying dithering to the image in the second format, based on an evaluation of at least a first luminance-dependent metric against a first predefined threshold that indicates the dithering is to be applied, wherein the first luminance-dependent metric is a luminance-dependent precision based on a surround luminance of a second pixel of the image in the second format and is computed from the second electro-optical transfer function, wherein the first predefined threshold is based on a luminance-dependent just noticeable difference metric.
Dependencies are inferred from the claim text.