Method and Apparatus for Image Data Transformation
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Abstract
Image data is transformed for display on a target display. A sigmoidal transfer function provides a free parameter controlling min-tone contrast. The transfer function may be dynamically adjusted to accommodate changing ambient lighting conditions. The transformation may be selected so as to automatically adapt image data for display on a target display in a way that substantially preserves creative intent embodied in the image data. The image data may be video data.
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Citations
53 Claims
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1-32. -32. (canceled)
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33. Apparatus comprising:
a pixel coordinate mapping unit configured to transform image data according to a parameterized transfer function characterized by a plurality of anchor points and a free parameter, the parameterized transfer function having a mid-range slope controlled by the free parameter, wherein transformations at the anchor points are not affected by the free parameter;
wherein the anchor points comprise black level and white level anchor points and a mid-tone anchor point, the black level anchor point corresponding to a transformation from a black level of a color-timing display used in color-timing or approving the image data to a black level of the target display used for display of the transformed image data, the white level anchor point corresponding to a transformation from a white level of the color-timing display to a white level of the target display;
wherein the mid-tone anchor point affects a target brightness of the image data on the target display;
wherein the black level of the color-timing display differs from the black level of the target display and/or wherein the white level of the color-timing display differs from the white level of the target display.- View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 48, 49, 50)
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45. A method for mapping image data for display on a target display, the method comprising transforming pixel values of the image data to corresponding transformed pixel values according to a parameterized transfer function characterized by a plurality of anchor points and a free parameter, the parameterized transfer function having a mid-range slope controlled by the free parameter, wherein transformations of pixel values corresponding to the anchor points are not affected by the free parameter;
- wherein the anchor points comprise black level and white level anchor points and a mid-tone anchor point, the black level anchor point corresponding to a transformation from a black level of a color-timing display used in color-timing or approving the image data to a black level of the target display, the white level anchor point corresponding to a transformation from a white level of the color-timing display to a white level of the target display;
wherein the mid-tone anchor point affects a target brightness of the image data on the target display;
wherein the black level of the color-timing display differs from the black level of the target display and/or wherein the white level of the color-timing display differs from the white level of the target display. - View Dependent Claims (46, 47, 51, 53)
- wherein the anchor points comprise black level and white level anchor points and a mid-tone anchor point, the black level anchor point corresponding to a transformation from a black level of a color-timing display used in color-timing or approving the image data to a black level of the target display, the white level anchor point corresponding to a transformation from a white level of the color-timing display to a white level of the target display;
Specification