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 4×4 pixel neighborhood
• INTER_LANCZOS4 – a Lanczos interpolation over 8×8 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.(50×50)

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

enlarge resize results

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