Method and Apparatus for Image Data Transformation
First Claim
Patent Images
1. An apparatus for the display management of images, the apparatus comprising:
- an input to receive an input image signal;
an input to access first information data for a reference display, the first information data comprising a black point level, a white point level, and a mid-point level for the reference display;
an input to access second information data for a target display, the second information data comprising a black point level, a white point level, and a mid-point level for the target display;
a processor to determine a transfer function to map pixel values of the input image signal to corresponding pixel values of an output image signal using the first and second information data, wherein the transfer function comprises three anchor points, wherein the first anchor point is determined using the black point levels of the reference and target displays, the second anchor point is determined using the white point levels of the reference and target displays, and the third anchor point is determined using the mid-point levels of the reference and target displays;
a processor to map the input image signal to the output image signal using the determined transfer function; and
an output to output the generated output image signal.
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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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12 Claims
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1. An apparatus for the display management of images, the apparatus comprising:
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an input to receive an input image signal; an input to access first information data for a reference display, the first information data comprising a black point level, a white point level, and a mid-point level for the reference display; an input to access second information data for a target display, the second information data comprising a black point level, a white point level, and a mid-point level for the target display; a processor to determine a transfer function to map pixel values of the input image signal to corresponding pixel values of an output image signal using the first and second information data, wherein the transfer function comprises three anchor points, wherein the first anchor point is determined using the black point levels of the reference and target displays, the second anchor point is determined using the white point levels of the reference and target displays, and the third anchor point is determined using the mid-point levels of the reference and target displays; a processor to map the input image signal to the output image signal using the determined transfer function; and an output to output the generated output image signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification