Method, apparatus, and device for determining spectral reflection

A device for determining spectral reflectance, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform operations comprising:

• obtaining a registration depth map and a target spectral image;
• obtaining depth information of a target point from the registration depth map, and obtaining a first grayscale value of the target point from the target spectral image;
• calculating three-dimensional coordinate information of the target point in a coordinate system corresponding to an imaging spectrum device according to the depth information of the target point, a first internal parameter of the imaging spectrum device, and first coordinate information of the target point in the target spectral image;
• determining, according to neighboring points of the target point, normal vector information corresponding to the target point;
• inputting the three-dimensional coordinate information and the normal vector information into a full-light model of a diffuse reflecting plate to obtain a second grayscale value;
• and
• obtaining reflectance of the diffuse reflecting plate, and calculating reflectance of the target point according to the reflectance of the diffuse reflecting plate, the first grayscale value, and the second grayscale value.

A non-transitory computer readable storage medium, wherein the non-transitory computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program causes the processor to perform operations comprising:

• obtaining a registration depth map and a target spectral image;
• obtaining depth information of a target point from the registration depth map, and obtaining a first grayscale value of the target point from the target spectral image;
• calculating three-dimensional coordinate information of the target point in a coordinate system corresponding to an imaging spectrum device according to the depth information of the target point, a first internal parameter of the imaging spectrum device, and first coordinate information of the target point in the target spectral image;
• determining, according to neighboring points of the target point, normal vector information corresponding to the target point;
• inputting the three-dimensional coordinate information and the normal vector information into a full-light model of a diffuse reflecting plate to obtain a second grayscale value;
• and
• obtaining reflectance of the diffuse reflecting plate, and calculating reflectance of the target point according to the reflectance of the diffuse reflecting plate, the first grayscale value, and the second grayscale value.