INDRIYATI ATMOSUKARTO
CSE576 PROJECT 2 - PANORAMIC MOSAIC STITCHING
THURSDAY, 28 APRIL 2005

Objective
Implement a system to combine a series of photographs into a 360-degree panorama.
The system will automatically align the photographs by determining their overlap and
relative positions and then blend the resulting photos into a single seamless panorama.

Results
To see the panorama view you will need to use an absolute URL and not just access the page locally, so to save trouble of uploading the page somewhere you can also access it from my webpage at http://www.cs.washington.edu/homes/indria/project/CSE576project2.

1. Test sequence
360º view



2. Sequence taken at Magnuson Park with Kaidan Head
Taken with Shani and Anna
The radial distortion parameters may not be absolutely accurate because there seems to be some warping
distortion especially at the walkpath and the grass. I remember it was a sunny day so not much exposure problem,
 but unfortunately a windy day as well so some of the tree leaves were moving as we were taking pictures.
360º view



3. Sequence taken at Magnuson Park with Kaidan Head
Taken with Shani and Anna
Same problem as above, the radial distortion parameter may not be the most accurate parameters since I noticed
some distortion in the grass. But then again grass is kinda difficult to match since it all looks the same.
360º view



4. Sequence taken at University District with Kaidan Head
There was a car passing by right at that last shot, I didn't see it. But overall it came out better than the previous
two sequences. This time I made sure the camera was zoomed out, and it was using manual mode to avoid
the same problem. Plus I avoided grassy patches all together :)
360º view




5. Sequence taken at Gasworks Park with Kaidan Head with same person in multiple frames
Mistake: I should have asked him to stay put for more than one frame which should reduce the ghosting effect, or
to stand in the middle of the frame for at least one frame since the blending effect puts heavier weight on middle pixels.
But what surprised me was this time the grass came out well.
360º view



6. Hand-held sequence at Skagit Valley
Mistake: too many people walking around so there are ghosting effects and problem in matching. Not to mention the
red trolley was just passing by at that last 2 frame.  Also I think I moved my body instead of moving the camera so
 the focal length parameter is not accurate which might explain the huge black gap at the bottom?
Well I literally didn't hold my hand steady so the height where each frame was taken are all different and I could not
quite figure out the overlap in between each frame cause the sun was shining so brightly making it really difficult
to see the LCD display. Another excuse is all tulips look roughly the same so of course there will be mismatches.
I think if I crop that black bottom part it would leave a better impression.
360º view


There much better isn't it :) 360º view
What worked well
For these test images it seems the feathering blend did a pretty good job and I was quite happy with the results. I used SIFT features for matching and
overall they match really well  except maybe on grass patchess and water.

What didn't work so well
Taking pictures while there are people moving inside, you will end up seeing a lot of ghosting effect.

Extra credit
Taking picture of same person in multiple frames  (Result 5)

Conclusion