Intensity separated local white balance correction

A system, comprising:

• a memory configured to store program instructions;
• and
• a processor configured to execute the program instructions to:
• generate a plurality of local gain lookup tables (LUTs), each local gain LUT corresponding to a color channel, and each local gain LUT providing a correlation between gain values and intensity values;
• and
• process an image, which includes:
• determining an intensity value for a pixel of the image;
• determining a local gain LUT out of the plurality of local gain LUTs corresponding to the color channel associated with the pixel;
• determining a local gain value based on the local gain LUT using the determined intensity value of the pixel;
• and
• applying the local gain value to the pixel.

A non-transitory computer readable medium storing program instructions that, when executed by a processor, cause the processor to:

• generate a plurality of local gain lookup tables (LUTs), each local gain LUT corresponding to a color channel, and each local gain LUT providing a correlation between gain values and intensity values;
• and
• process an image, which includes:
• determining an intensity value for a pixel of the image;
• determining a local gain LUT out of the plurality of local gain LUTs corresponding to the color channel associated with the pixel;
• determining a local gain value based on the local gain LUT using the determined intensity value of the pixel;
• and
• applying the local gain value to the pixel.