A computer-implemented image processing method, comprising: obtaining at least two to-be-synthesized images, the at least two to-be-synthesized images being images of an object captured at different exposures; determining an image luminance value of each of the at least two to-be-synthesized images, wherein the luminance value of a to be synthesized image is calculated with a luminance value of each pixel of the to- be synthesized image determining, for each of the at least two to-be-synthesized images, a luminance weight of each pixel of the to-be-synthesized image based on the image luminance value of the to-be-synthesized image and a luminance value of the pixel of the to-be-synthesized image; and obtaining a target image by performing image synthesis processing based on the luminance value of each pixel of the at least two to-be-synthesized images and the luminance weight of each pixel of the at least two to-be-synthesized images, characterized in that said determining the luminance weight of each pixel of the to-be-synthesized image based on the image luminance value of the to-be-synthesized image and the luminance value of the pixel of the to-be-synthesized image comprises: ordering the to-be-synthesized images in order of the image luminance values; determining a first association image of the to-be-synthesized image, the first association image being a to-be-synthesized image having an image luminance value adjacent in the order of the image luminance values to the image luminance value of the to-be-synthesized image; and determining the luminance weight of each pixel of the to-be-synthesized image based on the image luminance value of the to-be-synthesized image, the image luminance value of the first association image, and the luminance value of the pixel of the to-be-synthesized image. obtaining at least two to-be-synthesized images, the at least two to-be-synthesized images being images of an object captured at different exposures; determining an image luminance value of each of the at least two to-be-synthesized images, wherein the luminance value of a to be synthesized image is calculated with a luminance value of each pixel of the to- be synthesized image determining, for each of the at least two to-be-synthesized images, a luminance weight of each pixel of the to-be-synthesized image based on the image luminance value of the to-be-synthesized image and a luminance value of the pixel of the to-be-synthesized image; and obtaining a target image by performing image synthesis processing based on the luminance value of each pixel of the at least two to-be-synthesized images and the luminance weight of each pixel of the at least two to-be-synthesized images, characterized in that said determining the luminance weight of each pixel of the to-be-synthesized image based on the image luminance value of the to-be-synthesized image and the luminance value of the pixel of the to-be-synthesized image comprises: ordering the to-be-synthesized images in order of the image luminance values; determining a first association image of the to-be-synthesized image, the first association image being a to-be-synthesized image having an image luminance value adjacent in the order of the image luminance values to the image luminance value of the to-be-synthesized image; and determining the luminance weight of each pixel of the to-be-synthesized image based on the image luminance value of the to-be-synthesized image, the image luminance value of the first association image, and the luminance value of the pixel of the to-be-synthesized image. ordering the to-be-synthesized images in order of the image luminance values; determining a first association image of the to-be-synthesized image, the first association image being a to-be-synthesized image having an image luminance value adjacent in the order of the image luminance values to the image luminance value of the to-be-synthesized image; and determining the luminance weight of each pixel of the to-be-synthesized image based on the image luminance value of the to-be-synthesized image, the image luminance value of the first association image, and the luminance value of the pixel of the to-be-synthesized image.