CS/ECE 545 Homework 8

Complete by Class 10

Nearest-Neighbor Interpolation

Write a program to shrink or expand images using nearest-neighborinterpolation. Repeat the experiments you did with changing image size in Homework 1, but using non-integral factors.

Also, try to reduce an image and then expand it back to the original size using nearest-neighbor interpolation. Describe what happens.

Bilinear Interpolation

Repeat the above using bilinear interpolation. Bilinear interpolation is just linear interpolation along each of the 2 image axes.

Cubic Interpolation (optional)

Repeat the above using cubic interpolation. As shown in class, the 1-D cubic interpolation kernel is

where -3<a<0 is a parameter that controls the precise kernel shape.

What to hand in
Hand in to class

• Your Nearest-Neighbor Interpolation program, including enough comments so we can understand what you have done, samples, and an explanation paragraph.
• Same for Bilinear Interpolation.
• Same fo Cubic Interpolation (Optional).