Assignment 3: Image Warping and Mosaicing

-Charudatta Phatak

(cphatak@andrew.cmu.edu)

Section 1: Image rectification

The feature points were selected from the images and either a top view of the image or side of the image was calculated using the homography matrix.

(a) (b)

Figure 1: (a) original picture (b) looking down in the picture

(a) (b)

Figure 2: (a) original (b) Rectified image such that side wall is parallel to the image plane

Section 2: Image Mosaicing

I tried using the way suggested in class for generating the alpha mask but I wasn’t able to do it. So I just manually selected the the points of overlap within the mosaics and then used a linear ramp from 1 to 0

Image Set 1:

Figure 3: Original images

Figure 4: Mosaic blended using alpha blending

Image set 2:

Figure 5: Original Images (taken from the web-cam on top of Cathedral of learning bldg)

Figure 6: Mosaic blended using alpha blending

Image set 3:

Figure 7: Original Pictures (Taken a long time back at the pirates game. The camera was not rotated about the center of rotation and also the zoom is different for both the image, yet homography did a pretty good job to create a mosaic)

Figure 8: Mosaic blended using alpha blending

Figure 9: Mosaic blended using 2 level laplacian pyramid. I’m not sure why the image still looks blurry. The filter was a 3x3 smoothing filter.

Section 3: Bells and Whistles

1) Me and myself

Figure 10: There’s “too” me in the picture!

2) Paris and NY together!

Figure 11: This does not look very good. Looks more like a picture in picture, rather than blending. This is because of the huge color difference in the sky color.

3) Me and myself at times square-

Figure 12: Me and myself at times sq. NY.

4) Statue in air –

Figure 13: Statue of Liberty in air.