Hello, For stitching panoramic images with Hugin, recommendations for placing the Control Points include: 1) place Control Points for all overlapping image pairs 2) spread Control Points over the overlap image area
>From practical experience, results do improve, hence I suggest to change the recommendations as follows: 1a) place Control Points only for image pairs that are blended 2a) place Control Points only in the vicinity of the seam line 2b) if you move the seam line, also adapt your set of Control Points 2c) avoid placing Control Points into image corners This request is based on stitching panoramics using images from more than a dozen cameras by more than half a dozen manufacturers, the number of panoramics being well into the triple figures. The root reason is that with reference to the mathematically sound and physically motivated Brown-Conrady lens model only one distortion parameter is being used in hugin and panotools. Short of changing program code to include further (radial and possibly also non-radial) Brown-Conrady distortion parameters, the above recommendations mitigate the visual impact. One might consider to change Hugin's CPFind behaviour of selecting CP placement areas. CPFind and Fine-tune in itself are ok. I know I need to be careful not to be mislead by parallax effects and chromatic aberration. Based on mostly landscape panoramics my findings stem from a) systematic inspection of the vis.*.tif files using --visualize in the enblend settings b) detailed studies in several cases, observing image content shifts of several pixels, double figures even in corners c) compass angle errors at the percent level when comparing hugin panoramics with synthetic panoramics from the udeuschle.de tool Best regards Klaus -- 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/1e362068-d51a-4434-a199-f40a03e80ddc%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
