ALIGN_IMAGE_STACK(1)                 HUGIN                ALIGN_IMAGE_STACK(1)

       align_image_stack - Align overlapping images for HDR or focus stack

       align_image_stack [options] input files

       align_image_stack is used for the alignment of slightly misaligned
       images or for the registration of a stereo images pair.  When several
       differently exposed images are taken in the process of creating a High
       Dynamic Range image, the images are not perfectly aligned, and the
       quality of the HDR image created will suffer from this.
       align_image_stack uses the tools available to hugin to optimize the
       roll, pitch and yaw, as well as some parameters of the lens geometry,
       to align the images.

       Modes of operation:

       -p file
           Output .pto file (useful for debugging, or further refinement)

       -a prefix
           Output aligned images as prefix_xxxx.tif

       -o output
           Align images and merge them to HDR, generate output.hdr


       -v  Verbose, print progress messages. Repeat for higher verbosity

       -e  Assume input images are full frame fish eye (default: rectilinear)

       -t num
           Remove all control points with an error higher than num pixels
           (default: 3)

           Correlation threshold for identifying control points (default: 0.9)

       -f HFOV
           Approximate horizontal field of view of input images, use if EXIF
           info not complete

       -m  Optimize field of view for all images, except for first. Useful for
           aligning focus stacks with slightly different magnification.

       -d  Optimize radial distortion for all images, except for first.

       -i  Optimize image center shift for all images, except for first.

       -x  Optimize X coordinate of camera position

       -y  Optimize Y coordinate of camera position

       -z  Optimize Z coordinate of camera position

       -S  Assume stereo images - allow horizontal shift of control points.

       -A  Align stereo window - assumes -S

       -P  Align stereo window with pop-out effect - assumes -S

       -C  Auto crop the image to the area covered by all images

       -c num
           Number of control points (per grid) to create between adjacent
           images (default: 8)

       -l  Assume linear input files

       -s scale
           Scale down image by 2^scale (default: 1 [2x down-sampling])

       -g gsize
           Break image into a rectangular grid (gsize x gsize) and attempt to
           find num control points in each section (default: 5 [5x5 grid])

           Try to load distortion information from lens database

           Use the image order as given on the command line.  (By default
           images will be sorted by exposure values.)

           Use GPU for remapping

       -h  Display help summary.

       Written by Pablo d'Angelo. Also contains contributions from Douglas
       Wilkins, Ippei Ukai, Ed Halley, Bruno Postle, Gerry Patterson and Brent
       Townshend.  Stereo functionality added by Vladimir Nadvornik.

       This man page was written by Cyril Brulebois
       <>, updated by Terry Duell, and is
       licensed under the same terms as the hugin package itself.

"Version: 2019.2.0"               2020-05-12              ALIGN_IMAGE_STACK(1)