1. An image splicing method, comprising: acquiring a first image and a second image, wherein an overlapping region exists between the first image and the second image; determining a to-be-processed region within the overlapping region, wherein a region within the overlapping region except the to-be-processed region is a remaining region; acquiring a luminance component or chrominance component of each pixel of the remaining region, and obtaining a weight value of each adjacent pixel pair of the remaining region according to luminance components or chrominance components of all the pixels of the remaining region; setting a weight value of each adjacent pixel pair within the to-be-processed region, wherein a weight value of any adjacent pixel pair of the to-be-processed region is greater than a weight value of any adjacent pixel pair of the remaining region; determining a splicing path having the least seam line intensity of all splicing paths within the overlapping region as an optimal seam line, wherein the seam line intensity is a sum of weight values of all adjacent pixel pairs that the splicing path goes through; and performing image splicing on the first image and the second image along the optimal seam line.