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       autopanog - Autopano GUI frontend to create a panorama project.


       autopanog [options]


       GUI frontend for the autopano-sift package. It allows the processing of
       input images to create and match keypoint information, from which a PTO
       panorama project file can be created.


       --output <ptofilepath>
              Preset the PTO output filepath in the GUI.

       --imagelist <list.txt>
              Read input image filepathes from a list file.

              Enable  the use of absolute pathnames in the resulting PTO file.


       Source images
              The filenames of the image files that will be  processed.  Using
              the  "Add images" and "Remove selected" buttons, the list can be
              changed. At least two images must be loaded.

       Downscale resolution
              The maximum width and height resolution the image is  downscaled
              to.  That  is, if the image exceeds height or length compared to
              this value, the image is scaled so its longest side  is  exactly
              this  number  of  pixels  long.  This  value  is the single most
              important setting to optimizing memory usage. As a rough  guide,
              use  750  pixels  for  a 256MB RAM system, 1400 for a 512MB one.
              Values smaller than 400 here lead  to  poor  matching  for  most
              digicam images, due to sparse keypoints.

       Save option
              There  are  three  choices,  "Save  keypoints  to  files", "Save
              keypoints to files (compressed)" and "Keep keypoints  in  memory
              only".   The  save  prefix is used to name the file, followed by
              the original filename.  For the first two available options, XML
              files  are  created  with  the  ending ".xml". If the compressed
              option is selected, the XML files will be stored  in  compressed
              gzip(1)  format. For the last option, the keypoint data is piled
              up in memory. For systems with low memory,  this  option  should
              not  be  chosen,  otherwise  it speed things up, if the keypoint
              data is not needed afterwards.

       Save prefix
              How to name the keypoint files. The keypoint files are saved  to
              the current working directory plus this prefix plus the original
              filename of each image.

       Maximum keypoints per image pair
              After all filtering (matching,  pairing,  join-matches,  RANSAC)
              has  taken  place, the final keypoints are filtered for the best
              keypoints. A maximum of the supplied number is kept. If  you  do
              care  about optimization speed in the panorama layouting, choose
              a low number. If you do manual work and want  the  best  result,
              you can safely set this to a high number, such as 20 or more.

       Use RANSAC filtration
              If  enabled,  the  keypoint  matches  are  filtered using a good
              geometric model.  That means, only matches are kept  that  "make
              sense".  Although  the  matches  could  be correct matches, some
              matches are unwanted, like the matches moving  objects  (people,
              cars, ...) produce. Those are removed as well. It is recommended
              to leave this option checked except for special lens geometries,
              such as fisheye lenses.

       Use Area filtration
              As  we only keep a limited number of keypoints (specified in the
              maximum keypoint option), we have to discard the rest.  If  this
              option  is  checked,  the  points to discard are chosen in a way
              that maximizes the area enclosed by the remaining points. It  is
              believed  that  a  large  coverage  of  area  within the picture
              generally leads to better  optimization  results  later.  It  is
              recommended to leave this option checked.

       Automatic pre-aligning of images
              This  enables  a  set  of  options  and will cause an image pre-
              aligning algorithm to kick in. What it does is to  estimate  the
              basic  image  parameters  yaw,  pitch  and rotation based on the
              individual image  overlaps.  See  the  autopano(1)  manpage  for
              detailed instructions. In general, you need to take the pictures
              in a specific order (strict left-to-right  or  strict  right-to-
              left)  for  the first row of images. It really pays off to learn
              how  to  use  this  option  properly,  as  the   nona/PTStitcher
              optimizers are a lot better on pre-aligned images. Additionally,
              you  can  enable  automatic   horizon   line   creation,   which
              straightens the panorama.

       Input orientation
              Sets   how   the  images  were  taken.  If  you  have  "vanilla"
              orientation and the first row is taken as normal pictures,  just
              leave  "normal"  checked. Otherwise you need to tell the program
              where the bottom is located within the  images.   The  automatic
              bottom  finder only works well on flat-horizon images, so better
              not use it in case you  explicitly  know  where  the  bottom  is

       Generate horizon lines
              When pre-alignment is enabled, you can also enable the automatic
              creation of horizon information. For this to work, the first row
              of  images  must  have  its horizon roughly in the middle of the
              image. The number of points  to  create  can  be  given  in  the
              combobox,  whereas  sums  of powers of two (6, 14) work best. To
              create as much horizon lines as possible/meaningful, choose "*".

       PTO Output
              The filename of the PTO panorama project file to create.

       Use absolute pathnames for image files
              If  enabled, absolute filesystem pathnames are used to store the
              image filenames in the PTO file.  Using this option will  ensure
              the PTO file will work from anywhere.  However, you can not move
              the image files to another  location  afterwards  (for  example,
              burning  the  images  on  a  CD), as the files’ pathname change.
              Disabling this option will result in  only  the  filename  being
              stored in the PTO file.

       Output subpixel coordinates
              If  enabled,  sub-pixel  float  coordinates are used to describe
              matches between images in the PTO file.  This  works  with  most
              frontend  programs, such as hugin, but old frontend programs may
              have trouble with this.  In  this  case,  try  to  disable  this


       No  bugs known, if you find any, please send a bug report to me. I will
       try to fix it.


       Sebastian Nowozin <nowozin at cs dot tu dash berlin dot de>


       autopano-sift(7), autopano-complete(1)