On Jan 7, 10:29 pm, Tom Sharpless <[email protected]> wrote:
> Since I used a PT- > based stitcher, the results are polynomial coefficients describing the > deviation of the lenses' curves from the function r = f * theta, > where f is focal length, r and f are in pixels, and > theta is in radians. Or would be, except that the PT polynomial has > been tweaked to hold the r value corresponding to half the smaller > image dimension constant. It is straightforward to calculate the > coefficients of the preferable polynomial, that has constant unit > slope at image center (and so does not alter the apparent focal > length). To do that you need the factor by which PT multiplied the > 'ideal radius' input to the polynomial -- which unfortunately it > neither prints nor saves. Let me be more specific. To convert PT's coefficients to the coefficients of the equivalent slope-normalized polynomial, one must multiply them by appropriate powers of a factor I call PT's radial scale factor, rsf. In libpano the input to the radius-normalized polynomial is (radial distance in pixels) / (0.5 * min(wid, hgt). -- 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
