Correction of color tinted pixels captured in low-light conditions

An apparatus comprising a memory and one or more processors, wherein the one or more processors are configured to:

• receive first image data corresponding to reference luminance data and reference chrominance data for each of a plurality of pixels;
• determine that the first image data corresponds to a raw image captured in a dark environment;
• generate second image data by performing one or more tone mapping operations on the first image data, the second image data corresponding to current luminance data and current chrominance data for each of the plurality of pixels;
• and
• generate output image data to include, for each pixel of the plurality of pixels:
• an output luminance value of a corresponding pixel of the current luminance data;
• and
• chrominance values of the corresponding pixel from a selected one of either the reference chrominance data or the current chrominance data, the selection based at least in part on the reference chrominance data and the current chrominance data, wherein for each pixel of the plurality of pixels, the output image data includes the reference chrominance data instead of the current chrominance data when the corresponding pixel of the first image data is detected as grey and the corresponding pixel of the second image data is detected as color tinted.

A non-transitory computer-readable storage medium storing instructions that when executed by one or more processors of an image processing device, causes the image processing device to perform operations comprising:

• receiving first image data corresponding to reference luminance data and reference chrominance data for each of a plurality of pixels;
• determining that the first image data corresponds to a raw image captured in a dark environment;
• generating second image data by performing one or more tone mapping operations on the first image data, the second image data corresponding to current luminance data and current chrominance data for each of the plurality of pixels;
• and
• generating output image data to include, for each pixel of the plurality of pixels:
• an output luminance value of a corresponding pixel of the current luminance data;
• and
• chrominance values of the corresponding pixel from a selected one of either the reference chrominance data or the current chrominance data, the selection based at least in part on the reference chrominance data and the current chrominance data, wherein for each pixel of the plurality of pixels, the output image data includes the reference chrominance data instead of the current chrominance data when the corresponding pixel of the first image data is detected as grey and the corresponding pixel of the second image data is detected as color tinted.

An image processing pipeline, comprising:

• a raw image processing means to receive a raw image and perform one or more image processing operations on the raw image to produce a processed raw image;
• a color correction matrix (CCM) means to perform one or more CCM operations on the processed raw image;
• a denoising means to perform one or more denoising operations on an output of the CCM means to generate first image data corresponding to reference luminance data and reference chrominance data for each of a plurality of pixels;
• a tone mapping means to generate second image data by performing one or more tone mapping operations on the first image data, the second image data corresponding to current luminance data and current chrominance data for each of the plurality of pixels;
• and
• a color correction means configured to:
• receive the first image data and the second image data;
• determine that the first image data corresponds to a raw image captured in a dark environment;
• and
• generate output image data including, for each pixel of the plurality of pixels:
• an output luminance value of a corresponding pixel of the current luminance data;
• and
• chrominance values of the corresponding pixel from a selected one of either the reference chrominance data or the current chrominance data, the selection based at least in part on the reference chrominance data and the current chrominance data, wherein for each pixel of the plurality of pixels, the output image data includes the reference chrominance data instead of the current chrominance data when the corresponding pixel of the first image data is detected as grey and the corresponding pixel of the second image data is detected as color tinted.