This is the command linefind that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
linefind - Detect vertical features in images
linefind [options] -o output.pto input.pto
linefind is a detector for vertical features in images. It tries to find vertical lines
using the same algorithm as Calibrate_lens_gui and assigns vertical control points to
them. The detection runs on the source images, if the input images are rectilinear images.
In the other cases (e. g. fisheye images) the input images are reprojected to an
equirectangular projection and the detection works on the reprojected images. It uses the
roll value, saved in the pto project file, to determine what is "top" and "bottom". So
before running linefind check that your roll values are correct (E. g. when using images
straight from the camera, use a roll value of 0 for landscape and a value of 90 or 270 for
portrait images. If your camera has an orientation sensor, Hugin can detect this
information automatically and sets the roll value accordingly when adding such images into
Output Hugin PTO file. Default: '<filename>_line.pto'.
The maximum number of lines added per image (default: 5) Attention: Keep in mind that
more vertical control points will dominate the optimisation in favour of "normal"
Image number(s) to process. Normally linefind tries to find vertical lines in all
images of the project file. If you want to limit the detection to some selected
images, you can use this parameter. Can be used multiple times.
Thomas Modes, line detection code based on calibrate_lens by Tim Nugent
"Version: 2015.0.0" 2016-01-06 LINEFIND(1)
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