Methods and devices for gray point estimation in digital images

A device, comprising:

• at least one memory comprising image processing instructions, the at least one memory configured to receive and store a digital image frame;
• and
• at least one processor communicably coupled with the at least one memory, the at least one processor is configured to execute the image processing instructions to at least perform:
• determining red-green-blue (RGB) values for each pixel in at least a part of the digital image frame;
• calculating a first component value and a second component value in a pre-determined color space for the said each pixel, the first component value and the second component value calculated from the RGB values for the said each pixel;
• determining a two-dimensional (2-D) distribution based on the first component value and the second component value for the said each pixel;
• identifying one or more saturated color clusters in the 2-D distribution;
• and
• analyzing the one or more saturated color clusters to estimate a gray point for at least the part of the digital image frame.

A method, comprising:

• obtaining a digital image frame;
• partitioning the digital image frame into a plurality of parts based on a pre-determined criterion;
• and
• processing each part from among the plurality of parts by:
• determining red-green-blue (RGB) values for each pixel in said each part;
• calculating a first component value and a second component value in a pre-determined color space for said each pixel, the first component value and the second component value calculated from the RGB values for said each pixel;
• determining a two-dimensional (2-D) distribution based on the first component value and the second component value for said each pixel;
• identifying one or more saturated color clusters in the 2-D distribution;
• and
• analyzing the one or more saturated color clusters to estimate a gray point for said each part;
• and,
• performing white balancing of said each part based on the estimated gray point for said each part.