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       generatekeys - Generate SIFT keypoints from an image file


       generatekeys.exe imagefile keyfile[.gz] [downscaleResolution]


       Generate SIFT key descriptors for an image. It reads in the image file,
       finds SIFT keypoints for descriptive image locations  and  outputs  the
       SIFT  descriptors  to  the  keyfile. The image is internally doubled in
       size, as this increases the number of keypoints found. If  you  do  not
       want  this  behaviour  or  want  to  downscale  the  picture,  see  the
       downscaleResolution option. The resulting keyfiles can be processed  by
       the other utilities in the autopano-sift package.


              The  image  file name that will be read in and processed. It can
              be in any format readable by the  GDK  pixbuf  loaders.  Usually
              that includes JPEG, PNG and TIFF.

              The  name  of  the  keypoint XML file to generate. When ".gz" is
              used at the end of  the  filename,  the  file  is  transparently
              compressed using the gzip compression. See gzip(1)

              An  optional  integer width and height limitation. If given, the
              input image is downscaled so its larger  dimension  matches  the
              given size in pixels.  The smaller the downscale resolution, the
              smaller the memory requirements, but  also  less  keypoints  are
              found.  In  case  no downscale resolution is given, the image is
              doubled in size prior to processing, which leads  to  substantly
              more  keypoints.  If  you  use  0 as downscaleResolution you can
              switch this behaviour off and the original image is used without
              applying any scaling.


       The  memory  requirements  are quite big. If you have 256Mb of ram, you
       should go with a 700 downscale resolution, if you have 512Mb 1300 is  a
       good value.


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


       autopano-complete(1), autopano(1), autopanog(1), showone(1), showtwo(1)