imtophat

J = imtophat(I::Union{GMTimage{<:UInt8, 2}, GMTimage{<:Bool, 2}}; hsize=3, vsize=3)::GMTimage

keywords: GMT, Julia, image morphology, tophat

Do a morphological top-hat operation on a grayscale or binary image.

Top-hat computes the morphological opening of the image and does a: orig_image - opening

This transform can be used to enhance contrast in a grayscale image with nonuniform illumination. It can also isolate small bright objects in an image.

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.

Returns

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

Example

Perform the top-hat filtering and display the image.

using GMT

I = gmtread(TESTSDIR * "assets/rice.png");
J = imtophat(I, hsize=11, vsize=11);
grdimage(I, figsize=6)
grdimage!(J, figsize=6, xshift=6, show=true)

See Also

imdilate, imerode, imopen, imbothat