mutual information between two images — antsImageMutualInformation • ANTsR

compute mutual information between two images

antsImageMutualInformation(in_image1, in_image2, sampling.percentage, nBins)

Arguments

in_image1: antsImage
in_image2: antsImage
sampling.percentage: value between zero and one determining ratio of points in image to use for metric estimation
nBins: number of bins to use in joint histogram estimate, often set between 8 and 32

Value

mutual information value

Author

Brian B. Avants

Examples


fi <- antsImageRead(getANTsRData("r16"), 2)
mi <- antsImageRead(getANTsRData("r64"), 2)
testthat::expect_error(antsImageMutualInformation(fi, "hey"))
testthat::expect_error(antsImageMutualInformation("hey", fi))
fi3 <- resampleImage(fi, c(2, 2))
fi2 <- antsImageClone(fi)
pixeltype(fi2) <- "unsigned int"
testthat::expect_error(antsImageMutualInformation(fi2, mi))
#> function (in_image1, in_image2, sampling.percentage, nBins) 
#> NULL
testthat::expect_error(antsImageMutualInformation(fi3, mi))