Image-based matching of color and appearance of coatings containing effect pigments, using binary patterns derived from color model properties

At least one non-transitory machine-readable storage medium that stores instructions executable by at least one processor, the instructions configurable to cause the at least one processor to perform a method of matching color and appearance of coatings containing at least one effect pigment, the method comprising:

• obtaining, for a coating sample to be matched, sample color image data comprising pixel-specific color model properties, wherein the sample color image data is based on a digital image of the coating sample to be matched, as captured by a digital image capture system;
• creating local binary patterns based on the pixel-specific color model properties;
• generating a binary pattern histogram for the local binary patterns, wherein the binary pattern histogram arranges the local binary patterns into N distinct bins to obtain N bin counts, and wherein the binary pattern histogram represents an appearance feature descriptor of the coating sample to be matched;
• and
• utilizing the binary pattern histogram for comparison against a previously generated binary pattern histogram that serves as an appearance feature descriptor of a candidate coating specimen, wherein the local binary patterns are placed into a bin depending on the positions of 0s and 1s relative to each other in the local binary pattern without regard to the numerical value of the local binary pattern.

A computing system operable to match color and appearance of coatings containing at least one effect pigment, the computing system comprising:

• at least one processor;
• and
• at least one non-transitory machine-readable storage medium that stores instructions executable by the at least one processor, the instructions configurable to cause the at least one processor to perform a method comprising the steps of:
• obtaining, for a coating that contains at least one effect pigment, color image data comprising pixel-specific color model properties, wherein the color image data is based on a digital image of the coating, as captured by a digital image capture system;
• creating local binary patterns based on the pixel-specific color model properties;
• generating a binary pattern histogram for the local binary patterns, wherein the binary pattern histogram arranges the local binary patterns into N distinct bins to obtain N bin counts, and wherein the binary pattern histogram represents an appearance feature descriptor of the coating;
• and
• creating a coating histogram vector based on the binary pattern histogram, wherein the coating histogram vector is an N-dimensional vector comprising the N bin counts, wherein the coating histogram vector is usable for comparing color and appearance of the coating against color and appearance of at least one other coating, wherein the local binary patterns are placed into a bin depending on the positions of 0s and 1s relative to each other in the local binary pattern without regard to the numerical value of the local binary pattern.