This is actually a more appropriate correction than pitch, in many cases. Another very useful trick is to adjust the vertical lens shift parameter to reduce vertical parallax between left and right spheres. It is possible in PTGui to “lock” the pitch or roll angles, making them the same for all images, and this can be used to correct alignment errors. Camera alignment errors are a bit harder to correct in the stitcher, so it is best to align the cameras on the rig very carefully. The best approach for stereo panography is to calibrate each camera by stitching a 360 degree series, shot on-nodal with plenty of overlap, and use those calibrations for stitching the spheres. Stereo Photo Maker is good for rectifying normal images but not so good for fish-eye images. First of all, any difference between the lenses or the pointing directions of the cameras must be corrected, a process known as “rectifying” a stereo pair. This is often called the “cha-cha” method because of the sideways shift.Ī stereo panorama must faithfully represent the left-eye and right-eye points of view. For the “few views” method, two series of photos are taken with the camera shifted sideways + or - 35 mm from the normal centered position, and each series is stitched to one sphere. Left and right spheres are stitched from narrow strips selected from the right and left sides respectively of the images. For the “many views” method, the camera is mounted with the pivot axis 35 - 50 mm behind the pupil of a wide fish-eye lens, and a single series of images is taken. Moving subjects can be handled by masking, as in normal panography.īoth methods have single-camera variants, that need a truly static subject because the left and right views are taken at different times. Take a small number of stereo views, as for a regular panorama, and hide the errors by careful composition and masking. This method is very reliable but has problems with moving subjects. If they are narrow enough, the errors between adjacent strips will be too small to see. Then the panorama contains just a narrow vertical strip from each photo. Take a large number of closely spaced stereo views. There are two basic ways to handle this problem: But such photos will not easily stitch to two seamless spheres, because each series was taken from a moving viewpoint, not from a single fixed point as assumed by standard stitching software. The most obvious way to make a stereo panorama is to stitch together a series of stereo photos, taken by turning a pair of cameras.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |