Resizing images (Deep Learning)

Resizing images: speed vs quality vs implementation

Main filters for resizing: NEAREST, BILINEAR, BICUBIC, LANCZOS/ANTIALIAS

1. Speed: NEAREST > BILINEAR > BICUBIC > LANCZOS/ANTIALIAS
2. Output (downscaling) Quality: LANCZOS/ANTIALIAS > BICUBIC > BILINEAR > NEAREST
3. Pillow vs cv2 resize: Pillow seems to come out better (but really old discussion). Also, the outputs (resulting image pixel values) are different!

Sources

• https://pillow.readthedocs.io/en/3.0.x/releasenotes/2.7.0.html
• https://pillow.readthedocs.io/en/stable/handbook/concepts.html#filters
• https://stackoverflow.com/questions/7096323/python-pil-best-scaling-method-that-preserves-lines