Error from OpenCV code - Githubissues

PUTvision / qgis-plugin-deepness

Deepness is a remote sensing plugin that enables deep learning inference in QGIS

https://www.buymeacoffee.com/deepness

Apache License 2.0

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Error from OpenCV code #81

Closed geo-antony closed 1 year ago

geo-antony commented 1 year ago

Hi, I am using the Landcover model. Everytime i run a trial with vector file (Area mask layer) more than ~ 400 sq.km on satellite imagery, i get this error. I have tried this with Google, Bing, ESRI. The error invariably crops up. could you please suggest a resolution for this?

Error! Processing error: "Unhandled exception occurred. See Python Console for details"!

Details: error - Unknown C++ exception from OpenCV code Last Traceback: File "C:\Users/STPA CTP(RE)TVM/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\deepness\processing\map_processor\map_processor_segmentation.py", line 55, in _run full_result_img = cv2.medianBlur(full_result_img, blur_size)

przemyslaw-aszkowski commented 1 year ago

Hi @geo-antony , with a 400 km^2 image the processing module ends up with 2500000000 pixels to process. As it is allocated in the memory as an array, it is probably too much for the underlying library.

I would recommend processing the data in smaller chunks (e.g. 200 km^2) and merging the resulting output layers afterwards in QGIS. And thanks for reporting, we will add a memory check on Windows and show a readable error message.

geo-antony commented 1 year ago

Thank you @przemyslaw-aszkowski for the recommendation. Yes, in fact area below 300 sq.km seems to work just fine.

May I add a suggestion:

if you could provide the option to run a batch process, it'd be very helpful.

Thank you once again for this wonderful plugin.

przemyslaw-aszkowski commented 1 year ago

Hi, nice to hear your feedback :) Batch processing sounds like a good idea, we will definitively consider adding it