Exercise

Resampling

Images can be collected in a variety of shapes and sizes. Resampling is a useful tool when these shapes need to be made consistent. Two common applications are:

Downsampling: combining pixel data to decrease size
Upsampling: distributing pixel data to increase size

For this exercise, transform and then resample the brain image (im) to see how it affects image shape.

Instructions

100 XP

Shift im 20 pixels left and 20 pixels up, i.e. (-20, -20). Then, rotate it 35 degrees downward. Remember to specify a value for reshape.
Use ndi.zoom() to downsample the image from (256, 256) to (64, 64).
Use ndi.zoom() to upsample the image from (256, 256) to (1024, 1024).
Plot the resampled images.

Take Hint (-30 XP)