Locally-adaptive multi-scale image enhancement

An electronic device comprising:

• at least one processing device configured to:
• downsample an input frame;
• perform global contrast enhancement of the input frame based on the downsampled input frame to generate a globally contrast-enhanced frame;
• generate texture maps at different scale resolutions based on the downsampled input frame;
• generate clipped histograms at the different scale resolutions based on the downsampled input frame;
• generate lookup tables (LUTs) at the different scale resolutions based on the texture maps and the clipped histograms;
• apply the LUTs at the different scale resolutions to the input frame in order to generate locally contrast-enhanced frames;
• and
• blend the locally contrast-enhanced frames and the globally contrast-enhanced frame to generate an output frame.

A non-transitory machine readable medium containing instructions that when executed cause at least one processor to:

• downsample an input frame;
• perform global contrast enhancement of the input frame based on the downsampled input frame to generate a globally contrast-enhanced frame;
• generate texture maps at different scale resolutions based on the downsampled input frame;
• generate clipped histograms at the different scale resolutions based on the downsampled input frame;
• generate LUTs at the different scale resolutions based on the texture maps and the clipped histograms;
• apply the LUTs at the different scale resolutions to the input frame in order to generate locally contrast-enhanced frames;
• and
• blend the locally contrast-enhanced frames and the globally contrast-enhanced frame to generate an output frame.