Hello, I am involved in a project that repeats history survey images in the Canadian Rockies (www.mountainlegacy.ca). Generally, we find the approximate location (like a mountain top) where the survey image has been taken, get as close to the spot where the original image was shot, and reshoot the composition. Since camera/lens used are generally unknown and differ from survey to survey we use a much wider angular field of view than that of the original photographers, thus our historic scene is encompassed within the boundaries of our repeat photo. After the repeat has been taken the final stage in processing is to overlay the historic survey photo with the repeat. The historic photos, while having a smaller field of view, have a greater resolution (pixel dimensions) than the repeat image (due to the fact that they are scanned glass plates). Consequently, part of the overlay process is to scale the historic image down, center (which is usually off), and rotate so the images match as much as possible. Our current workflow involves manually executing these procedures in photoshop for each pair. However, I believe that Hugin/panotools has some real potential in automating this process. The key though is automatic control point detection. I've struggled to get this to work between the images. Some obvious differences between the repeat and historic image are that they contain landscape changes (trees grow, etc), lighting can be different, skies can be cloudy, etc. However, I'm hoping that there are enough similarities (rock ridges) that some control points can still be detected. Would anyone be able to advise some optimal control point parameters for autopano-sift or panomatic that might get this working? Or are the cp algorithms just not cut out for this type of work?
I've posted some downsized examples here: http://webhome.csc.uvic.ca/~cgat/BRI1922_B22-48_delete_smaller.jpg http://webhome.csc.uvic.ca/~cgat/HB2_A0004037_delete.jpg The colour image has a field of view of 67 degrees while the historic one has a field of view of 37 degrees. If you are interested, we use a Hasselblad H3D-39 II with the 35.8mm HC lens. Thanks, Chris -- 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 hugin-ptx@googlegroups.com To unsubscribe from this group, send email to hugin-ptx+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/hugin-ptx
