Color interpolation for image sensors using a local linear regression method

A method for demosaicing an image represented by raw sensor values generated by pixels within an array of pixels having at least two color planes, each of said pixels within said array of pixels producing a respective one of said raw sensor values in one of the at least two color planes for said image, said method comprising:

• receiving at least a group of said raw sensor values produced by said pixels within a region of said image, said region being less than said image;
• determining regression coefficients representing the linear relations between the color planes for said region using at least a portion of said group of raw sensor values, including using correlation coefficients between different ones of the color planes in said region to determine said regression coefficients;
• and
• calculating missing color sensor values associated with said pixels in said region of said image using said regression coefficients.

A method for demosaicing an image represented by raw sensor values generated by pixels within an array of pixels having at least two color planes, each of said pixels within said array of pixels producing a respective one of said raw sensor values in one of the at least two color planes for said image, said method comprising:

• receiving at least a group of said raw sensor values produced by said pixels within a region of said image, said region being less than said image;
• determining regression coefficients representing the linear relations between the color planes for said region using at least a portion of said group of raw sensor values, including using a blurred image associated with said region of said image to determine said regression coefficients;
• and
• calculating missing color sensor values associated with said pixels in said region of said image using said regression coefficients.

A method for demosaicing an image represented by raw sensor values generated by pixels within an array of pixels having at least two color planes, each of said pixels within said array of pixels producing a respective one of said raw sensor values in one of the at least two color planes for said image, said method comprising:

• receiving at least a group of said raw sensor values produced by said pixels within a region of said image, said region being less than said image;
• determining regression coefficients representing the linear relations between the color planes for said region using at least a portion of said group of raw sensor values;
• calculating missing color sensor values associated with said pixels in said region of said image using said regression coefficients;
• calculating interpolated missing color sensor values for said region from said group of raw sensor values;
• and
• comparing said interpolated missing color sensor values with said associated calculated missing color sensor values for each of said pixels within said region to detect grid artifacts produced by said calculated missing color sensor values.