Spatially adaptive tone mapping for display of high dynamic range (HDR) images
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United States of America Patent
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Apr 11, 2017
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N/A
app pub date -
Nov 24, 2015
filing date -
Nov 24, 2015
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Abstract
Techniques are provided for spatially adaptive tone mapping for display or reproduction of HDR images on devices with lower dynamic range capability. An example system may include a log-conversion circuit to convert luminance data, from a received image, to a logarithm domain. The system may also include an edge-aware filter circuit to decompose the log domain luminance data into a base layer, a small scale detail layer, and a large scale detail layer. The system may further include an amplitude adjustment circuit to shift and scale data amplitudes in each of the layers to a selected range and a linear-conversion circuit to convert the adjusted layers from the log domain back to the linear domain. The system may further include a tone compression circuit to generate compressed linear domain layers and a luminance data reconstruction circuit to generate compressed luminance data based on the compressed linear domain layers.
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