This is a script written in MATLAB to stitch several overlapping images together. The user manually marks corresponding pairs of points between adjacent images first. The script is then executed to calculate the forward homographies, final mosaic size and then the backward homographies. Finally, the destination scan algorithm is used to produce the final image. Alpha blending was also implemented to remove visible seams that might arise at the edges of the original images.

I took four images of the Fullerton Hotel in Singapore to prepare for the photo stitching exercise:

The original overlapping images to be stitched up

I then marked out 16 pairs of corresponding points for each pair of adjacent images, although theorectically 4 pairs will be sufficient. A sample of the corresponding points for a pair of adjacent images are as such:

The 16 corresponding points for images 1 and 2

Once all the markings have been done, I executed the MATLAB script and the final mosaic is obtained. Alpha blending is applied to remove visible seams that might exist after the images are placed together.

Final mosaic formed from stitching the four overlapping images