opening

opening operator is defined as dilate(erode(img)). Intuitively, opening operation fills the white holes in the image.

using ImageMorphology
using TestImages
using ImageBase
using ImageShow

img = restrict(testimage_dip3e("fig0940")) # rice
img01 = @. Gray(img > 0.5)
mosaic(img, img01; nrow=1)

out1 = opening(img) # default: all spatial dimensions, r=1, a box-shape SE
out2 = opening(img; dims=(2,)) # only apply to the second dimension
out3 = opening(img; r=5) # half-size r=5

# also to the binary version
out1_01 = opening(img01)
out2_01 = opening(img01; dims=(2,))
out3_01 = opening(img01; r=5)

mosaic(out1, out2, out3, out1_01, out2_01, out3_01; nrow=2, rowmajor=true)

See also

closing is the dual operator of opening in the following sense:

complement.(opening(img)) == closing(complement.(img))

true

For a comprehensive and more accurate documentation, please check the opening reference page.

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