Abstract: A DNS query method includes receiving, by a first communication device, a DNS query to obtain an FQDN; sending, by the first communication device, first information to a second communication device, where the first information includes the FQDN or N server IP addresses corresponding to the FQDN, and N is a positive integer; obtaining, by the first communication device, server experience information corresponding to the N server IP addresses from the second communication device, where the server experience information is used to indicate service experience of a server corresponding to each of the server IP addresses; and sending, by the first communication device, a DNS response to a terminal based on the server experience information.

Abstract: A method includes: 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; calculating 3D coordinate information of the target point 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 normal vector information corresponding to the target point according to neighboring points of the target point; inputting the 3D 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.