Project 0 - Pixel Power
Sonja Duric

Question 1 - Removing high frequencies from images

Fast fourier transform

The original image Low frequencies in the Fourier space Smoothed image
Multiplying with the given mask works because it cuts out all the frequencies but those in the top left corner, the low ones.

Smoothing with a Gaussian Mask

The original image The smoothed image
The effect of the smoothing is much more subtle in this case, but more even.

Question 2 - Sharpening an image

Because flowers are pretty

The original image The sharpened image
The flower image used here came from this site.

Question 3 - Inserting a ghost

Only Casper could get up these stairs...

What could get up these stairs? Casper can!
I placed Casper in the center of a matrix padded with zeros and then overlayed him above the stairs. The original room image came from this site while Casper was found here.

Question 4 - Revealing nightlife

Why perform for an empty auditorium?

A very dark auditorium. Now we can see the audience.
In the result image we can see the audience in front of the stage as well as some lights above the stage that looked like empty blackness in the original. This is a picture I took over winter break.