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Man Pages


Manual Reference Pages  -  ALIGN_IMAGE_STACK (1)

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NAME

align_image_stack - Align overlapping images for HDR or focus stack creation

CONTENTS

SYNOPSIS

align_image_stack [options] input files

DESCRIPTION

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.

OPTIONS

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
Modifiers:
-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)
--corr=num 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])
--distortion Try to load distortion information from lens database
--use-given-order Use the image order as given on the command line. (By default images will be sorted by exposure values.)
--gpu Use GPU for remapping
-h Display help summary.

AUTHORS

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 <cyril.brulebois@enst-bretagne.fr>, updated by Terry Duell, and is licensed under the same terms as the hugin package itself.

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Version: 2016.0.0 ALIGN_IMAGE_STACK (1) 2016-01-23

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