ssim: Structural similarity index
In colinr23/spatialcompare: Spatial Pattern Comparison Metrics

Description Usage Arguments Details Value See Also

This function implements the structural similarity index of Wang et al. (2003) formulated for comparison of raster spatial objects.

1	ssim(img1, img2, w, gFIL = TRUE, edge = FALSE, ks = c(0.01, 0.03))

`img1`	is a `raster` object to compare
`img2`	is a `raster` object to compare
`w`	is the width of the neighbourhood in number of pixels out from centre cell
`edge`	is a binary flag for whether a torroidal edge correction should be applied
`ks`	is a vector of length 2 which contains values for constants in the SSIM formula. If ignored default values will be used.
`GFil`	is a binary flag for whether a Gaussian filter should be applied as a smoothing function

The ssim function can be used to generate the three component indices of the SSIM index as well as the composite index. Two raster objects are the key arguments which will be used to compare. These two raster objects must have the same CRS, extent, and cell size.

ssim returns a list with 5 objects. The first is the value of the global ssim statistic. Objects 2-5 are all raster objects that contain the composite index, luminance, contrast, and structure components respectively.

spatialcompare

colinr23/spatialcompare documentation built on May 13, 2019, 9:54 p.m.