Method and electronic device for generating texture maps through multi-angle lighting capture

A method for generating texture maps through multi-angle lighting photographing, comprising the following steps:

• 1) Constructing a multi-angle lighting photographing environment;
• wherein the multi-angle lighting photographing environment comprises a box (10);
• the box (10) houses a testing platform (5), a photographing device (6), and a detachable multi-angle light source (14);
• the photographing device (6) is positioned directly above the testing platform (5), while the multi-angle light source (14) are located beneath the photographing device (6), for illuminating the testing platform (5) from different angles;
• the light sources include, from top to bottom, the top light source, upper light source, lower light source, and bottom light source;
• the top light source, upper light source, and lower light source are situated above the testing platform (5);
• each of the top light source, upper light source, lower light source, and back light source is independently composed of at least one group of lamps;
• 2) placing a color chart on the testing platform (5) and always photographing the color chart with only one group of lights turned on;
• traversing all the lower light sources, upper light sources, and top light sources;
• processing the obtained images using a standard color calibration procedure to generate a corresponding color correction matrix for each lighting direction;
• 3) placing a flat white paper on the testing platform (5) and always photographing the white paper with only one group of lights turned on;
• traversing all the lower light sources, upper light sources, and top light sources;
• for any white paper image captured with a specific lighting direction, applying the color correction matrix, corresponding to the same lighting direction, to generate a color-corrected white paper image;
• further processing the color-corrected image to calculate a corresponding light intensity correction coefficient for the respective lighting direction;
• 4) placing nothing on the testing platform (5), and capturing calibration images for transparency calculation:
• turning on all lower light sources, photographing to obtain an image without backlighting, referred to as ImageAlpha0;
• turning on all bottom and lower light sources, photographing to obtain an image with backlighting, referred to as ImageAlpha1;
• 5) placing an object to be scanned on the testing platform (5),
• photographing the object always with only one set of lights turned on;
• traversing all the lower light sources, upper light sources, and top light sources;
• for each captured image of the object, applying the color correction matrix corresponding to the same lighting direction to generate a calibrated image of the object;
• multiplying R, G, B values of each pixel in the color-corrected object image by the corresponding light intensity correction coefficient generated under the same lighting direction, to obtain the final corrected image for that lighting direction;
• photographing the object to be scanned with all lower light sources turned on, to obtain an image without backlighting, referred to as ImageBlend0;
• photographing the object to be scanned with all bottom and lower light sources turned on, to obtain an image with backlighting, referred to as ImageBlend1;
• 6) generating a base color texture map;
• 7) generating a roughness texture map;
• 8) generating a metallic texture map;
• 9) generating a normal texture map;
• 10) generating a transparency texture map.