GMERLIN_SSIM(1) User Manuals GMERLIN_SSIM(1)NAME
gmerlin_ssim - compare two images
SYNOPSIS
gmerlin_ssim <image1> <image2> [<output_image>]
DESCRIPTION
gmerlin_ssim will calculate the structural similarity between <image1> and <image2> and store the resulting image into <output_image>.
The input images should be of the same dimension and format.
The SSIM algorithm is taken from the paper "Image Quality Assessment: From Error Visibility to Structural Similarity" by Z. Want et. al.
published in IEEE Transactions on image processing, VOL. 13, NO. 4, APRIL 2004. Homepage of the author:
http://www.ece.uwaterloo.ca/~z70wang/research/ssim/
gmerlin_ssim is part of the Gmerlin suite of media applications.
Gmerlin January 2011 GMERLIN_SSIM(1)
Check Out this Related Man Page
PHISTO(1) General Commands Manual PHISTO(1)NAME
phisto - compute a luminance histogram from one or more RADIANCE pictures
SYNOPSIS
phisto picture ..
DESCRIPTION
Phisto is a script that calls pfilt(1), rcalc(1) and histo(1) to compute a histogram of log luminance values for foveal samples in the
given picture files. A foveal sample covers approximately 1 degree, though this script does not use this exact area. The minimum and max-
imum values are determined, and 100 histogram bins are uniformly divided between these extrema. Foveal samples less than 1e-7 cande-
las/sq.meter are silently ignored. If no picture is named on the command line, the standard input is read.
The primary function of this script is to precompute histograms for the pcond(1) program, which may then be used to compute multiple, iden-
tical exposures. This is especially useful for animations and image comparisons.
EXAMPLE
To compute two identical tone mappings for image1.hdr and image2.hdr:
phisto image1.hdr image2.hdr > both.histo
pcond -I -h image1.hdr < both.histo > image1m.hdr
pcond -I -h image2.hdr < both.histo > image2m.hdr
AUTHOR
Greg Ward Larson
SEE ALSO histo(1), pcond(1), pfilt(1), pvalue(1), rcalc(1), total(1)RADIANCE 3/12/98 PHISTO(1)
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