Preselector
In his first post (reply) above, Gotz said;
“The reason why the alignment errors do not change is simply because you did’t change (I figure) the preselector setting.”
But towards the end of my original post I had said:
“Preselector features has no effect that I can find.”
chris then explained:
“preselector features, gets used in the next stage of alignment.”
To which I asked:
“By ‘gets used in the next stage of alignment’ do you mean Reconstruction i.e. after Alignment is complete?”(not answered yet).
With 29 good photos, I tried Preselector features set at 100K, 10K (default), 9,7,6,5,4,3,2,1K.
These made no difference at all to RC’s analysis of the photo set – the same distribution of Cache file sizes every time,
hence giving same Optimax figures (see above) – 148K Max features per image (default 40K) and 148K/12.1 = 12.3K Max features per Mpx (default 10K).
Right down to Preselector features set at 6K, all 29 pics registered in one Component,
and every run gave approx. 105K Points count, 265K Total projections, 44secs, 0.34px Median and 0.45px Mean error.
With Preselector features set ridiculously low at 5,4,3,2,1K, Registration, Points count and Total projections all fell apart, but secs and errors stayed same.
So I guess chris is right - Preselector irrelevant to Alignment, only comes in with Reconstruction - will be checking it out shortly.