Detecting non coded markers

[vitoseto]

Hello everybody,
I would like to ask you, does someone have an idea if it is possible to detect non coded markers like this? I have been working on my diploma thesis recently, that is based on accourancy test of 300 control points. Thank you for all your assistance.

[bigben]

After alignment
Tools > Markers > Detect Markers. 
Marker type: Cross (non coded)

[vitoseto]

Thank you for the answer, I tried that steps with no results before. I decided that better way is load marker coordinates and system will show estimated location that is almost as exact as center of marker.

[bigben]

You can increase the sensitivity if the markers are small on the image.  Depending on your subject though, you may get some false markers detected as you get higher eg. branches in trees with white sky behind.