Simple Feathering
I chose the UC simple because it was relatively flat and regular which makes it a good choice for simple feathering. (Note, the diagonal lines are just an artifact of the scaled web page version. click the link to get the full-size versions of the pictures).
Below is the panorama. The stitching on the left was done with a linear feathering window only 21 pixels wide. The right required a window of 201 pixels. See if you can find the cut lines.
To see the left cut line click here
To see the right cut line click here
then zoom the image to full size.
Laplacian Blending and Pittsburgh Weather
The following 2 photos were taken approx. 5 seconds apart.
Here's what you get if you simply combine the picture at the cut line (with no blending).
Here's are the cuts using a linear blending windows of 100,200, and 400 pixels wide.
For laplacian blending I padded/trimmed the pictures to be 2048 x 4096 (after a lot of errors trying it without dimensions that were a power of 2).
Here are the attempts with a windows size of 2 pixels set to blend 1/2 from each picture (.5,.5). for pyramid levels of 1, 3, 5, and 7.
| Level 1 | Level 3 | Level 5 | Level 7 |
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The band in the center is caused because the lower frequencies all get grouped together in the final level (rather than having the same frequency step as the higher levels). If I could get the final level to be 1 pixel wide (which I am working on however, there are issues trying filter something that small and you get odd boundary conditions), then the band would expand to fill the whole picture.
Increasing the window size alone doesn't help because that essentially has the
effect of going up one level in the pyramid. Instead I increased the window
size and linearly stepping down the blending values. After some experimentation I chose a windows size of 32 of 1/32 increments.
Here's the result:
Another method I may try (if I have time) is to vary the size of the window so the lower levels (higher frequencies) have a smaller window while the higher levels have a wider window. This will hopefully cut down on the blurring at the cut line.
