Projection error of a marker

[enocsanz]

Hi Alexey,

Could you please help me to get the (mean) projection error (in pix) of a marker?
Just an example is OK.

Thank you very much.

[Alexey Pasumansky]

Hello enocsanz,

To calculate the projection error for marker "marker" on the single image "camera" you can do the following:

Code: [Select]

projection = marker.projections[camera].coord #2D coordinates on the corresponding image of the marker projection (green/blue flag)
reprojection = camera.project(marker.position) #2D coordinates on the corresponding image of reprojected marker position
error = (projection - reprojection).norm() #difference in pixels
So to get the average error you need to loop by every camera where the given marker appears.