Author Topic: Save Images with Markers  (Read 1588 times)


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Save Images with Markers
« on: November 12, 2021, 03:55:09 PM »
Before taking multiple images and camera alignment (will take much time),
I would like to simply check whether or not markers can be detected in a single image.

I run my python script in headless mode.
My script has the following procedure.

1. Read a single image that contain coded target markers.
2. Detect the markers.
   (coded-target can be detected even before camera alignment)
3. Save the image in which the markers are drawn.

I have completed step 2, but I don't know how to get the image data with the marker (flag) drawn on it.
Is it possible to obtain a 2D image with markers as displayed in Metashape's GUI?


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Re: Save Images with Markers
« Reply #1 on: November 13, 2021, 03:26:14 PM »
You could use PIL library to insert a graphic where your marker coordinates are and save it as a copy. It's a fairly simple library to work with.


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Re: Save Images with Markers
« Reply #2 on: November 14, 2021, 06:04:32 PM »
Thanks for your reply.
I found the following page and gave it a try.

The marker position(x[pix], y[pix]) on the image could be obtained in the following way.

Code: [Select]
for marker in chunk.markers:
    for cam, proj in marker.projections.items():
        target_pos = (proj.coord.x), proj.coord.y)

I'm more familiar with OpenCV, I used "cv2.drawMarker" to draw the markers.
This Q&A has been resolved.