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ssim

Arguments:

• [reference],_patch_size>0,_max_value>0

Description:

Compute the Structural Similarity Index Measure (SSIM) between selected images and specified reference image.

This command does not modify the images, it just returns a value or a list of values in the status.
When downsampling_factor is specified with a ending %, its value is equal to 1+(patch_size-1)*spatial_factor%.

SSIM is a measure introduced int the following paper:
Wang, Zhou, et al., "Image quality assessment: from error visibility to structural similarity.",
in IEEE transactions on image processing 13.4 (2004): 600-612.

The implementation of this command is a direct translation of the reference code (in Matlab), found at :
https://ece.uwaterloo.ca/~z70wang/research/ssim/

Default values:

patch_size=11, and max_value=255.