Patent ID: 8837849

Claim:
A method comprising: filtering the digital image with an edge-preserving detail-reducing filter, wherein the digital image has a noise level and includes a plurality of pixels, wherein the edge-preserving detail-reducing filter reduces weak high-frequency detail in the digital image while leaving the strong edges in the digital image unaffected; determining a matrix from the filtered digital image, wherein the matrix is the result of one or more structure adaptive functions applied to the filtered digital image, wherein at least one of the structure adaptive functions is based in part on a color distance between a reference color and a color of at least one pixel in the digital image, wherein the reference color is a desired color, and wherein the matrix comprises one or more values, each of the one or more values determining a magnitude of an enhancement filter to apply at a corresponding pixel in the digital image; and modifying the digital image using the enhancement filter, adjusted by the one or more matrix values, to produce an enhanced digital image with minimal amplification of the noise level.