Method and apparatus for image data transformation
First Claim
Patent Images
1. A method to improve display management of images, the method comprising:
- receiving first information data for input video data, the first information data comprising a minimum luminance level, a maximum luminance level, and an average luminance level for the input video data;
accessing 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;
determining a transfer function to map pixel values of the input video data to corresponding pixel values of output image data using the first and second information data, wherein the transfer function comprises three anchor points, wherein the first anchor point is determined using the minimum luminance level of the input video data and the black point level of the target display, the second anchor point is determined using the maximum luminance level of the input video data and the white point level of the target display, and the third anchor point is determined using an average luminance level for the input video data and the mid-point level of the target display; and
mapping the input video data to the output image data using the determined transfer function.
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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.
86 Citations
14 Claims
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1. A method to improve display management of images, the method comprising:
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receiving first information data for input video data, the first information data comprising a minimum luminance level, a maximum luminance level, and an average luminance level for the input video data; accessing 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; determining a transfer function to map pixel values of the input video data to corresponding pixel values of output image data using the first and second information data, wherein the transfer function comprises three anchor points, wherein the first anchor point is determined using the minimum luminance level of the input video data and the black point level of the target display, the second anchor point is determined using the maximum luminance level of the input video data and the white point level of the target display, and the third anchor point is determined using an average luminance level for the input video data and the mid-point level of the target display; and mapping the input video data to the output image data using the determined transfer function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification