PanoTools NG:
Re: Can I fix line errors in PTGui?
j.houghton@... 2014-Nov-07 22:57:03
Q1: To generate control points between a pair of images, select them for display in the Control Points tab and then go to the Control Points menu and select Generate control points for image x and image y. You can also select a number of images on the Source Images tab or Image Parameters tab and use the Control Points menu option Generate control points for selected images. Generate extra points in specific areas by shift+drag a rectangular selection on one of the images and then right click in the rectangle to select Generate control points here from the sub menu (but note that this can only be used when the images have been reasonably aligned).
Q2.To quickly assign the nominal image parameters: on the Image Parameters tab select a set of 12 boxes for one row in the yaw column and click the Fill Yaw button at the bottom of the page. Enter the number of shots per row and the starting angle (0) and let it generate the appropriate yaw values. Select the corresponding 12 boxes in the pitch column and enter the pitch angle for that row (eg 30 degrees). Roll is 0 by default.
Q3. The lens settings can be set to 16mm with a crop factor of 1.5. These are simply used to calculate an initial value for the horizontal fov parameter. These values (and the y,p,r values) will all be changed a little by the optimizer to align the control points correctly. You could set the lens to 24mm with a crop factor of 1 or 12mm with a crop factor of 2 and they would have exactly the same effect, as they all give a 35mm equivalent focal length of 24mm.
Q4. The horizontal and vertical shift parameters compensate for the optical axis of the lens not being exactly centered on the centre of the camera's image sensor. The parameter values are in units of pixels. It''s usual to include these in the optimization (but not the shear parameters, which may be needed when processing scanned images).
Finally - don't overlook the Help for this screen option, which will usually display much useful information about the current tab/window.
John