1. An image interpolation method, wherein an image comprises multiple pixel points and the pixel points are arranged in a two-dimensional matrix composed of rows in a horizontal direction and columns in a vertical direction, the method comprising: obtaining pixel values of integer pixel points and/or sub-pixel points in a row, a column or in any other directions of the pixel points, wherein the sub-pixel points are pixel points between adjacent integer pixel points; obtaining pre-calculated interpolation coefficients corresponding to the integer pixel points and/or sub-pixel points in the row, column or in any other directions of the pixel points; and interpolating the pixel points according to the obtained pixel values of the integer pixel points and/or sub-pixel points and corresponding interpolation coefficients.