1. A method for obtaining a high dynamic range image, comprising: obtaining a pixel value of each pixel in a long exposure image and a short exposure image of a same scene; determining a brightness value of each pixel in the long exposure image and the short exposure image according to the pixel value of each pixel in the long exposure image and the short exposure image; determining an objective brightness value of each pixel in a combined image combining the long exposure image with the short exposure image according to the brightness value of each pixel in the long exposure image and the short exposure image; determining a color value of each pixel in the long exposure image and the short exposure image according to the pixel value and the brightness value of each pixel in the long exposure image and the short exposure image; determining a color value of each pixel in the combined image according to the color value of each pixel in the long exposure image and the short exposure image; correcting the color value of each pixel in the combined image according to the brightness value of each pixel in the long exposure image and the short exposure image and the objective brightness value of each pixel in the combined image so as to obtain a corrected color value of each pixel in the combined image; determining a pixel value of each pixel in the combined image according to the objective brightness value and the corrected color value of each pixel in the combined image; and obtaining a high dynamic range image according to the pixel value of each pixel in the combined image.