Compute Image Similarity Metrics

Compute Image Similarity Metrics

image_similarity(image1, image2, image1_mask = NULL, image2_mask = NULL, ...)

Arguments

image1	Object of class nifti or character filename. Passed to the fixed image in imageSimilarity
image2	Object of class nifti or character filename Passed to the moving image in imageSimilarity
image1_mask	Mask for first image (optional)
image2_mask	Mask for second image (optional)
...	Additional arguments to pass to imageSimilarity

Value

A numeric value

Note

Not all metrics are symmetric.

Examples

library(ANTsRCore)
library(extrantsr)
x =  getANTsRData( 'r16' )
y =  getANTsRData( 'r30' )
image_similarity(x,y, type="MeanSquares")
#> [1] 1300.522
image_similarity(y,x, type="MeanSquares")
#> [1] 1300.522

image_similarity(x,y, type="Correlation")
#> [1] -0.8218697
image_similarity(y,x, type="Correlation")
#> [1] -0.8218697

# NOT SYMMETRIC
image_similarity(x,y, type="MattesMutualInformation")
#> [1] -0.5060095
image_similarity(y,x, type="MattesMutualInformation")
#> [1] -0.5059599

# NOT SYMMETRIC
mutual_information(x, y)
#> [1] -0.5278006
mutual_information(y, x)
#> [1] -0.5261494

image_similarity(x,y, type="ANTSNeighborhoodCorrelation")
#> [1] -0.7409918
image_similarity(y,x, type="ANTSNeighborhoodCorrelation")
#> [1] -0.7409918
image_similarity(x,y, type="JointHistogramMutualInformation")
#> [1] -0.7837214
image_similarity(y,x, type="JointHistogramMutualInformation")
#> [1] -0.7837214
image_similarity(x,y, type="Demons")
#> [1] 1327.76
image_similarity(y,x, type="Demons")
#> [1] 1339.285