Adding all control-points by hand hardly bears thinking about. I often have to add some, but I think I have always had at least a substratum of automatically generated cps. My problem with old maps is not the one you mention. Rather, it is that they are often faded and photographed in low-level lighting and thus rather indistinct, which can defeat automatic systems, though the human eye is prepared to make a judgment about the best correspondence. And sometimes there are features like bushes along field boundaries that are conventionally spaced and mislead the cp finder.
But these considerations should apply less to scanned images and I didn't need to add any to the example I showed of an old(ish) map of the Ipswich area. Rather, I had to prune a few that CP Find had delivered. Admittedly, I had helped it by getting the constituent images roughly into position by hand before invoking it. Roger On 30 August 2017 at 09:38, bugbear <bugb...@papermule.co.uk> wrote: > Roger Broadie wrote: > >> Of course, long linear features can offer control-point detectors >> difficulties if there are no distinguishing details on or near them. But in >> the case of your image showing the discontinuities the seam clearly passes >> near or even through plot numbers and they should give control-point >> detectors something to bite on. Thus you could try dragging a rectangle >> around them and selecting that great standby "create control points here": >> see e.g. > > > I often (ish) use my camera and a pano head as a substitute for the A0 > scanner I don't own, usually > for maps and newspapers. > > In both cases I do NOT use automatically generated CPs. There is so much > fine scale > repetition in text (all the printed characters are identical) and a map > (symbols, text again) > that false hits are inevitable. > > For truly large items, I don't use a pano head, but move the entire tripod > and camera over > the item, grid-fashion. This is laborious to do, and laborious in hugin too. > > BugBear > > -- > 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 hugin-ptx+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/hugin-ptx/59A6798D.9080006%40papermule.co.uk. > > For more options, visit https://groups.google.com/d/optout. -- 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 hugin-ptx+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/CAHQACerfCKoVr4_4-cN3Ca%3DGkVu%2BYk4rEJsqChrUnBEGUTXqPg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
