cv2 resize interpolation methods

• INTER_NEAREST - a nearest-neighbor interpolation
• INTER_LINEAR - a bilinear interpolation (used by default)
• INTER_AREA - resampling using pixel area relation. It may be a preferred method for image decimation, as it gives moire’-free results. But when the image is zoomed, it is similar to theINTER_NEAREST method.
• INTER_CUBIC - a bicubic interpolation over 4x4 pixel neighborhood
• INTER_LANCZOS4 - a Lanczos interpolation over 8x8 pixel neighborhood

from the official docs.

I use this often when using cv2.resize method. For example,

import cv2

img = cv2.imread("testimage.png")
resized = cv2.resize(img, (100,100), interpolation=cv2.INTER_LINEAR)

reducing resize results

here is the default image.(50x50)

default image

and here are the results of reducing it to 15x15 with various interpolation methods.

cv2.INTER_AREA

cv2.INTER_CUBIC

cv2.INTER_LANCZOS4

cv2.INTER_NEAREST

cv2.INTER_LINEAR

enlarge resize results

with the same default image used above, here are the results when it is enlarged to 100x100

cv2.INTER_AREA

cv2.INTER_CUBIC

cv2.INTER_LANCZOS4

cv2.INTER_LINEAR

cv2.INTER_NEAREST