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US 2017/0103729 A1Published application
Enhanced tone mapper for high dynamic range images and video
AssigneeSTMicroelectronics Asia Pacific Pte Ltd
InventorsYong HUANG, Lucas HUI
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Abstract
Various embodiments provide tone mapping of images and video from one dynamic range to an available dynamic range of a display device while preserving or enhancing image details. According to one embodiment, an enhanced tone mapping module is configured to decrease a luminance of an image or video from a high dynamic range to a standard dynamic range. Conversely, according to one embodiment, an enhanced inverse tone mapper to increase a luminance of an image or video from a standard dynamic range to a high dynamic range.
Claims14
A method, comprising:
- receiving red, green, blue data of an image from a content provider, the received red, green, blue data having a high dynamic range;
- calculating luminance data from the red, green, blue data;
- inputting the luminance data to a low pass filter and generating low frequency luminance data as an output;
- inputting both the luminance data and the low frequency luminance data to a gain calculating circuit;
- calculating a gain based on the luminance data and the low frequency luminance data;
- applying a contrast map to the received red, green, blue data to generate mapped red, green, blue data having a standard dynamic range;
- generating enhanced red, green, blue data by applying the gain to the mapped red, green, blue data;
- and
- outputting the enhanced red, green, blue data to a display device.
6 more elements
A method, comprising:
- receiving red, green, blue values of an image from a content provider, the received red, green, blue values having a high dynamic range;
- converting the received red, green blue values to luminance values;
- filtering the luminance values with a low pass filter to generate filtered luminance values;
- inputting both the luminance values and the filtered luminance values to a gain calculating circuit;
- calculating a gain value using the luminance values and the filtered luminance values;
- generating a contrast map;
- generating mapped red, green, blue values by mapping the received red, green, blue values to values within a lower dynamic range using the contrast map;
- enhancing the mapped red, green, blue values by applying the gain value to the mapped red, green, blue values;
- and
- providing the enhanced red, green, blue data to a display device.
7 more elements
Dependencies are inferred from the claim text.