FWIW I’ve used Hugin to create night sky panoramas, and I’ve always had to manually define the control points. One star looks pretty much like another, and cpfind can’t easily tell them apart. Even after manually setting points and running one iteration of alignment it still has problems...
Sent from my PDP-11/93 > On Jul 22, 2018, at 3:45 AM, [email protected] wrote: > > > [email protected] Google Groups > Topic digest > View all topics > aligning star pics with hugin... recommended cpfind params? - 1 Update > aligning star pics with hugin... recommended cpfind params? > "David W. Jones" <[email protected]>: Jul 20 10:11PM -1000 > > On 07/18/2018 06:22 PM, clepsydrae wrote: > > > No -- since the reason for the stack is that I intend to do a gmic > > median_image for the purpose of noise reduction I didn't want to do any > > per-image NR. Would it help for CP-creation? > > Possibly. Others can explain about how cpfind works, but I think it > works on areas rather than specific points. Otherwise, how is it > supposed to determine that Bright Spot A in upper left isn't the same as > Bright Spot B in lower right? > > > adjustment effectively removed a lot of noise.) I.e. it seems like the > > only way cpfind is finding anything at all is by matching subtle > > variations in the darker areas. > > Don't know. I haven't worked with starfield images like yours. Perhaps > setting a few manual control points in Hugin would help get the process > started? > > > > I confess cluelessness, but it seems like cpfind is not designed to look > > for little bright points in a dark field. but rather to match more > > textural image areas. > > Well, it does pick control points on edges of things or where edges > intersect, at least on my ordinary photos. > > > stars, defined as less than X pixels in diameter and with a certain > > degree of contrast to the background (or even just a brightness > > threshold as you describe). > > That would make sense to me! > > > since it seems like it "should" be among the most simple kinds of > > alignment to do, that maybe it's a good suggestion? Or maybe it just > > belongs in a different CP tool altogether. > > Something worth mentioning to them. They may know of others using cpfind > in similar situations as yours, people who could give you some ideas. > Somebody has to prepare all those astronomical photos for publication! > > > (Or maybe someone knows some magic I can pass to cpfind on the command > > line to make it work!) > > Don't know. IIRC, you were having it run with the --fullscale option? > Does it do any better without that? > > -- > David W. Jones > [email protected] > wandering the landscape of god > http://dancingtreefrog.com > Back to top > You received this digest because you're subscribed to updates for this group. > You can change your settings on the group membership page. > To unsubscribe from this group and stop receiving emails from it send an > email to [email protected]. -- A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ --- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/42E3C7F1-1F17-4E8D-8317-7AEA3FB3AECB%40gmail.com. For more options, visit https://groups.google.com/d/optout.
