1. A downsampling based display method comprising: obtaining an input image, wherein the input image comprises a plurality of pixels; obtaining at least two pixels, which are neighboring with a to-be-calculated downsampling pixel in a target image, on each of at least two directions from the plurality of pixels of the input image to obtain at least four first neighboring pixels, and calculating theoretical values of the at least four first neighboring pixels on the at least two directions; obtaining errors between the theoretical values of the at least four first neighboring pixels and a corresponding original value, and determining weight coefficients for calculating the downsampling pixel according to the errors; calculating an estimation value of the downsampling pixel according to the weight coefficients and a weighted cubic interpolation calculation model built in advance for the downsampling pixel, using the above steps to calculate corresponding estimation values of the other downsampling pixels in the target image, and thereby obtaining a downsampling processed image; and displaying the downsampling processed image.