bwskell

J = bwskell(I::Union{GMTimage{<:UInt8, 2}, GMTimage{<:Bool, 2}}; type::Int=1, maxiters::Int=0, conn::Int=4)::GMTimage

keywords: GMT, Julia, image morphology, Thinning, Skeletonize

Reduce all objects to lines in 2-D binary image.

Reduces all objects in the 2-D binary image I to 1-pixel wide curved lines, without changing the essential structure of the image. This process, called skeletonization, extracts the centerline while preserving the topology.

Args

• I::Union{GMTimage{<:UInt8, 2}, GMTimage{<:Bool, 2}}: Input image.

Kwargs

• type::Int=1: 1 To thin the foreground (normal situation), or 2 to thin the background.

• maxiters::Int=0: Maximum number of iterations allowed. Use 0 to iterate untill completion.

• conn::Int=4: 4 for 4-connectivity, 8 for 8-connectivity.

Returns

A new GMTimage of the same type as I with the skeleton.

Example

Skeletonize a binary image.

using GMT

I = gmtread(TESTSDIR * "assets/bone.png");
J = bwskell(I);
grdimage(I, figsize=6)
grdimage!(J, figsize=6, xshift=6, show=true)