Feature #24: Scale via bilinear interpolation

Scale the image (smaller or larger) via a smarter algorithm than nearest-neighbor.

Feature description

Scale the image (smaller or larger) via a smarter algorithm than nearest-neighbor.

Parameters	value
name	scale_bilinear
Command	-c scale_bilinear X (with X the scale, such as 0.5 or 3)
Input	an image
output	a new image image_out.bmp scaled by X from the input image

Usage

./freud.exe -f images/input/image.jpeg -c scale_bilinear 3

Output

A new image image_out.bmp, but 3 times larger than the input image

Tips for implementing the feature Do not hesitate to look for resources online to find out how the algorithm works.

For instance (https://towardsdatascience.com/image-processing-image-scaling-algorithms-ae29aaa6b36c):

Careful: there are several online resources that do not cover every aspects of the algorithm. You might end up with black pixels and holes in your resulting image.

Additional information

Example (scale=0.5):

Input	Output