some modify

import math

from scipy import interpolate

def small_map2(x, range):

    ratio = x/range

    return 3.01 + ratio*(range-8.02)

    ratio = (x-1)/(range)

    return 2.01 + ratio*(range-4.02)

def find_value(x, y, pix_x):

    f = interpolate.interp1d(x, y, kind='cubic')

    return f(pix_x)

def bicubic_11810818(input_file, dim):

    # Load image

    in_height = in_image.shape[1]

    out_image = np.zeros(dim, dtype=np.uint8)

    print(in_image)

    # Perform Exchange

    for col in range(out_width):

        for row in range(out_height):

            pix_x = small_map2(col*((in_width-1)/(out_width-1)), out_width)

            pix_y = small_map2(row*((in_height-1)/(out_height-1)), out_height)

            x=[math.floor(pix_x)-1, math.floor(pix_x), math.floor(pix_x)+1, math.floor(pix_x)+2]

            y=[math.floor(pix_y)-1, math.floor(pix_y), math.floor(pix_y)+1, math.floor(pix_y)+2]

            z=in_image[math.floor(pix_x)-1:math.floor(pix_x)+3, math.floor(pix_y)-1:math.floor(pix_y)+3]

            f = interpolate.interp2d(x, y, z, kind='cubic')

            out_image[col, row] = f(col, row)

            line = np.zeros(4)

            for i in range(4):

                line[i] = find_value(

                    [math.floor(pix_y) - 1, math.floor(pix_y), math.floor(pix_y) + 1, math.floor(pix_y) + 2],

                    in_image[math.floor(pix_x)-1+i, math.floor(pix_y)-1:math.floor(pix_y)+3],

                    pix_y

                )

            out_image[col, row] = find_value(

                [math.floor(pix_x)-1, math.floor(pix_x), math.floor(pix_x)+1, math.floor(pix_x)+2],

                line,

                pix_x

            )

    # Save Image

    print(out_image)

    io.imsave("bicubic_11810818.tif", out_image)

    io.imsave("shrank_bicubic_11810818.tif", out_image)

if __name__ == '__main__':

    bicubic_11810818("rice.tif", [461, 461])

 No newline at end of file

    bicubic_11810818("rice.tif", [205, 205])