Minimal example on line detection, description and matching

[adricostas]

Hello,

First of all, thank you for sharing this amazing work. I was trying to create a very simple example based on this tutorial http://b1ueber2y.me/projects/LIMAP/docs/tutorials/line2d.html to detect, describe and match lines. I have solved some errors taking a look at the code in line_triagulation.py and functions.py but it is still not working. It ends up with an Aborted error.

Here is the code:

import limap.util.config
import limap.base
import limap.line2d

cfg = limap.util.config.load_config("/data/libraries/limap/cfgs/triangulation/default.yaml") # example config file
view1 = limap.base.CameraView(limap.base.Camera("PINHOLE", 0), "/data/libraries/limap/data/ai_001_001/images/scene_cam_00_final_preview/frame.0000.color.jpg") # initiate an limap.base.CameraView instance for detection. You can specify the height and width to resize into in the limap.base.Camera instance at initialization.
view2 = limap.base.CameraView(limap.base.Camera("PINHOLE", 1), "/data/libraries/limap/data/ai_001_001/images/scene_cam_00_final_preview/frame.0001.color.jpg") 
detector = limap.line2d.get_detector(cfg["line2d"]["detector"]) # get a line detector
segs1 = detector.detect(view1) # detection
desc1 = detector.extract(view1, segs1) # description
segs2 = detector.detect(view2) # detection
desc2 = detector.extract(view2, segs1) # description

extractor = limap.line2d.get_detector(cfg) # get a line extractor
matcher = limap.line2d.get_matcher(cfg["line2d"]["matcher"], extractor) # initiate a line matcher
matches = matcher.match_pair(desc1, desc2) # matching  

It seems that execution stops when the method segs1 = detector.detect(view1) is called. Any idea on how to solve the problem?

Thank you very much in advance!

[B1ueber2y]

Hi. Thanks for the interest!

From the provided information I guess it is either a torch problem at inference (the torch is not correctly installed), or that the directory to the images is incorrect. Could you look into this or provide more error messages?

Thanks!

[adricostas]

Hi,

Thanks for the quick reply. It doesn't seem a problem with torch because I can execute the line mapping example without any problem http://b1ueber2y.me/projects/LIMAP/docs/tutorials/triangulation.html. I don't have more information about the error but it seems that the problem is in this function img = camview.read_image(set_gray=True) that is inside the detect function.

[B1ueber2y]

I see. This is due to an error in the docs and an unsupported feature. This is fixed in the new update here: https://github.com/cvg/limap/pull/41. Thanks so much for reporting and contributing here. And let me know if there are still issues in your demo.

Thanks again!

[adricostas]

Thank you! Now it is working.