Forum

Author Topic: How to reduce the marker error (pix)  (Read 5144 times)

Bene

  • Newbie
  • *
  • Posts: 37
    • View Profile
How to reduce the marker error (pix)
« on: May 31, 2016, 04:31:52 PM »
Hi folks,

I'm having difficulties in reduce the marker error (pix) and would like to know if somebody can help me with this.

I used Total Station to get the coordinates and I'm using the marker detect tool (cross non-coded) to project them in the images.

My workflow is:

1. Add images and uncheck the cameras
2. Align the photos (Key point = 120.000 and Tie point limit = 0)
3. Delete the reprojection error points with 0.5 and optimize
4. Take average reprojection error in pixels from the Reference pane and use this value as Tie Point accuracy (in pixels);
5. Optimize the camera alignment
6. Add markers' projections automatically through marker detection
7. Load the coordinates
8. Take reprojection error for markers from the Reference pane and use this value as Marker Accuracy parameter in the Reference pane settings;
9. Optimize the camera alignment.

I repeat the optimization based on markers after refining the Marker Accuracy until the optimization results are no longer significant.

Therefore, my results are not so good. I need a precision of millimetres and I'm getting 4 or 5 centimetres.

Somebody can help me?

All the best!

Heinrich

  • Newbie
  • *
  • Posts: 44
    • View Profile
Re: How to reduce the marker error (pix)
« Reply #1 on: June 03, 2016, 09:36:54 AM »
Do you know exact distances between your markers? I guess you do, as you know their positions and can calculate the distances.
Try making scale bars between them, and update.

Uygar

  • Newbie
  • *
  • Posts: 30
    • View Profile
Re: How to reduce the marker error (pix)
« Reply #2 on: July 07, 2016, 04:34:42 PM »
What for
Fit b1
fit b2
fit p3
fitp4 anf fitk4  ? Why unchecked ?