Strange edge effects with segmentation and super-resolution models

[Saareem]

As seen in the pictures above, the plugin produces weird edge artifacts on the top and right borders of the image. There is most likely one pixel missing from the output mask (top and right), but I'm not able to locate the exact place in code. This occurs with the X2 super-resolution model and road segmentation model from the Deepness Model ZOO as well with some of my own models.

The edge effects reduce the usability of the results a lot as those on the edges can not be trusted.

[Saareem]

Blue pen is my own annotation, of course.

[przemyslaw-aszkowski]

Hi, Does it happen when the processed area is unlimited or when the processed area is exactly as the orthophoto? I can't see it on your image, but when I run the road segmentation model from ZOO it looks good (see below)

If there is no more data in your orthophoto, it may be just the actual model output, as the model output is often not stable at the edges. Otherwise please provide detailed instructions on how to reproduce it.

By the way, there indeed is an issue with "off by one pixel" #123, but in your screenshot, it looks like dozens of pixels.

Cheers Przemek

[Saareem]

I was using "Entire layer" option. There seems to be one pixel missing from the full output but only on the right edge... The edge effect is there still.

The same happens when I use "Visible part" option

It might be partly because my spatial resolution (25 cm/px) is slightly off the model default resolution (21 cm/px). So I tried resampling:

It did not help at all. I can share the resampled raster for tests. https://drive.google.com/file/d/1t4HNe2D8-Qvla7rRvqqMQmRcUte6oJrX/view?usp=sharing

[Saareem]

There's definitely something strange going on the edges. The background layer and road layer are the only layers reaching to the whole processing extent. The other layers are cut off entirely. I'm using the default settings for the DeebLabV3_landcover4c model from the metadata. However, that 40% overlap seems excessive. With 0 px overlap I get this:

It's better in a way but then the only layer reaching the whole processing extent (the raster) is the background layer.

[przemyslaw-aszkowski]

Thanks for the detailed description. We will be looking into the issue once we have some time. In the meantime, if you want, you can help investigate this issue. Cheers Przemek