I have just returned from a trip where airline baggage restrictions meant I had no tripod nor pano-head with me. So I tried the hand-held- with-plumb-line method.
I tied a weighted string around the pivotal point of my fisheye lens and shot 8x45° instead of my usual 6x60° ... easier to guess, more overlap and more latitude for error. The first couple of panoramas have stitched OK ... not MUCH different from my usual tripod mounted method. However I am finding that some control points are being allocated a large "Distance" in the range 60-100 even though I can SEE that the control point in each shot, is set on exactly the same grain of grit on the pavement or bolt in the fence, or whatever. Usually, on my tripod mounted panos, I can get most control points to a distance of under 2 with a few - the extreme "rogue" points - maybe at a distance of 10 or 12. This time the highest distances are all on points that match with the down shot, which is probably the one with the least accurate camera positioning. So my questions are about the nature of control-point-distance and what I can or should do about it. As I understand it the "distance" means something like "how far apart those points in the images would be when each of their parent images is projected onto the sphere that makes up the whole panorama". Is that in any way close to what it really means? Does the processing at the stitching stage use the distance measure to transform the images and make the points match? In that case is a high-distance point - that is known to be an optically-accurate-match - useful and worth having? Or should I just delete of high-distance points? Does a point with a high distance, that is known to be an optically- accurate-match, reflect camera movement away from the pivotal point? Is there anything I can do to "fix" one of these high-distance points. My intuition was that this was where "Translation" was going to be helpful ... but when I tried doing Optimise with Translation I got the effect that I always get any time I use Translation and the preview changed to a roughly square image with all the source images stacked on top of each other. Anything helps me to better understand the nature of Control Points and the use of Optimise-Translation would be very welcome. George -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/hugin-ptx
