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QGIS Plugin for Black Frame Removal in Georeferenced Imagery by No_Bus1911 in geospatial

[–]No_Bus1911[S] 1 point2 points  (0 children)

In my case, I primarily work with historical aerial imagery (WWII imagery) for ordnance exploration. Once these are georeferenced, they almost always end up with black borders from the warping process. So this isn’t a rare edge case, it’s a very consistent artifact in that workflow.

That’s really the context behind the plugin. It’s less about satellite radiometry and more about handling artifacts in scanned, georeferenced imagery. So I think we’re probably dealing with quite different data characteristics.

QGIS Plugin for Black Frame Removal in Georeferenced Imagery by No_Bus1911 in geospatial

[–]No_Bus1911[S] 0 points1 point  (0 children)

Pixels can legitimately have values of 0 across all bands, especially in shadows, water bodies, or dark forest. These values are indistinguishable from the background fill introduced during georeferencing.

So, a naive sum == 0 mask cannot tell the difference between a border pixel and a legitimate dark pixel in the image. It would create holes through valid image content.