smoothImage.Rd
Smooth image or multi-channel image
smoothImage(inimg, sigma, sigmaInPhysicalCoordinates = TRUE, FWHM = FALSE, max_kernel_width = 70)
inimg | Image to smooth |
---|---|
sigma | Smoothing factor. Can be scalar, in which case the same sigma
is applied to each dimension, or a vector of length |
sigmaInPhysicalCoordinates | If true, the smoothing factor is in millimeters; if false, it is in pixels. |
FWHM | If true, sigma is interpreted as the full-width-half-max (FWHM) of the filter, not the sigma of a Gaussian kernel. |
max_kernel_width | Maximum kernel width |
antsImage smoothed image
set.seed(1234) img <- makeImage(c(5,5), rnorm(25)) simg <- smoothImage(img, c(1.2,1.5)) testthat::expect_equal(sum(simg), -5.59352651424706) testthat::expect_error(smoothImage(img, c(1.2,1.5, 3))) simg2 <- smoothImage(img, c(1.2,1.5), FWHM = TRUE) multi = antsImageRead(getANTsRData("multi_component_image")) smulti <- smoothImage(multi, c(1.2,1.5)) means = sapply(splitChannels(smulti), mean) testthat::expect_equal(means, c(86.0794883092244, 81.913664855957, 85.519760093689))