imopen

J = imopen(I::Union{GMTimage{<:UInt8, 2}, GMTimage{<:Bool, 2}}; hsize=3, vsize=3, sel=nothing)::GMTimage

keywords: GMT, Julia, image morphology, opening

Open the grayscale or binary image I.

The morphological opening operation is an erosion followed by a dilation, using the same structuring element for both operations. The opening is performed with a matrix of 0’s and 1’s with width hsize and height vsize, or, if possible, with the structuring element strel. Later case is faster but it is only available for binary images, where by binary images we mean Boolean images or images with only 0’s and 1’s of UInt8 type.

Args

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

Kwargs

• hsize::Int=3: Horizontal size of the 'box' structuring element.

• vsize::Int=3: Vertical size of the 'box' structuring element.

• sel=nothing: Structuring element (See strel function). An alternative to hsize and vsize options. If equal to nothing, a structuring box of size hsize x vsize is used.

Returns

A new GMTimage of the same type as I with the opening applied.

Example

Illustration of opening with a structuring box of width 20

using GMT

I = gmtread(TESTSDIR * "assets/packman.png");
J = imopen(I, sel=strel("box", 20));
grdimage(I, figsize=7)
grdimage!(J, figsize=7, xshift=7.1, show=true)

See Also

imdilate, imerode, imclose, strel