Color correction matrix calibration for high dynamic range sensors

A system comprising a high dynamic range (HDR) sensor;

• and
• a processing device coupled to the HDR sensor, the processing device being associated with an image signal processing (ISP) pipeline, and the processing device is to:
• receive a target image captured using the HDR sensor at a first bit-depth associated with the high dynamic range sensor;
• apply one or more dynamic range compression operations to brightness values associated with the target image to obtain compressed brightness values;
• determine brightness gain values using the brightness values and the compressed brightness values;
• apply the brightness gain values to each color channel of respective pixels of the target image to obtain a compressed target image such that a color ratio of the compressed target image is preserved, the compressed target image being associated with a second bit-depth of the ISP pipeline;
• and
• adjust a color correction matrix (CCM) associated with the ISP pipeline using the compressed target image as a calibration reference, including analyzing differences between color values of the compressed target image and corresponding known color values, and determining CCM coefficients based on the differences.

One or more processors associated with an image signal processing (ISP) pipeline comprising processing logic to:

• receive a target image captured using a high dynamic range (HDR) sensor at a first bit-depth associated with the HDR sensor, wherein the ISP pipeline is associated with a second bit-depth;
• apply one or more dynamic range compression operations to brightness values associated with the target image to obtain compressed brightness values;
• determine brightness gain values using the brightness values and the compressed brightness values;
• apply the brightness gain values to each color channel of respective pixels of the target image to obtain a compressed target image such that a color ratio of the compressed target image is preserved;
• and
• adjust a color correction matrix (CCM) associated with the ISP pipeline using the compressed target image as a calibration reference, including analyzing differences between color values of the compressed target image and corresponding known color values, and determining CCM coefficients based on the differences.