Hi,
I'm using my normal workflow, which is to align the cameras, then improve the alignment using gradual selection. I will select points using
Gradual selection -> image count
Gradual Selection -> Reconstruction uncertainty
Gradual Selection -> Projection accuracy
and finally
Gradual Selection -> Reprojection error
At each stage I will delete a proportion of the 'worst' points, ensuring I keep the projections for each image above 150, and then optimise cameras.
At each stage I check the info to see how the process is affecting the RMS and Max reprojection errors. The latest project I ran had the following stats after the 1st, 3rd and final steps:
RMS reprojection error 0.190378 (0.648795 pix)
Max reprojection error 0.571035 (25.5418 pix)
RMS reprojection error 0.195382 (0.470916 pix)
Max reprojection error 0.745797 (3.44066 pix)
RMS reprojection error 0.134116 (0.318879 pix)
Max reprojection error 0.441291 (1.39499 pix)
My (first) question is, what do the two numbers mean - I assumed that they were the same value, just in different units, but the dimensionless number goes up while the pixel value goes down. What, then, is the first number, and which is the 'important' value (I assume it's the pix?)
Second, slightly related, is for the optimise camera options I have been ticking only:
f, cx, cy, k1, k2, k3, p1, p2
for the first three steps, and all the options for the final step. But the options in the newest version of Metashape have changed and I wondered if anyone had thoughts on which options to use now (especially the three new advanced options)?
Also, any thoughts and comments on the overall workflow would be greatly appreciated...