| Taking the previous page a step further let's
look at the practice of zenith/nadir patching and how it reduces noise.
 Once
again taking our test image , we'll now make two panoramas, one using a
single row of 3 images and another with an additional horizontal and
vertical patch image inserted. A rectilinear view of the zenith will then be
extracted from each panorama to compare the noise. The test image was
cropped to 170° prior to stitching to get an "expected" result from
PTStitcher.
|
Single Row |
Single Row + Zenith/Nadir Patch |
| Panorama |
 |
 |
| Enlarged section of zenith |
 |
 |
Notice that in the single row panorama the distortion of the noise is not
evenly distributed making it extremely difficult to filter/retouch. |
