A method for image zoom out processing includes: determining whether a predetermined zoom out ratio is smaller than a first predetermined threshold; when the predetermined zoom out ratio is smaller than the first predetermined threshold, performing a zoom out process on an image according to the first predetermined threshold by a bilinear interpolation algorithm to obtain a zoomed out image; determining whether a product of a resolution of the zoomed out image and the first predetermined threshold is greater than or equal to a target resolution; when the product is greater than the target resolution, repeating the step of performing the zoom out process; when the product is smaller than the target resolution, performing the zoom out process on the image according to a second predetermined threshold by the bilinear interpolation algorithm so that the resolution of the zoomed out image reaches the target resolution.
