espadon (version 1.11.3)

bin.opening: Binary volume opening

Description

The bin.opening function performs a morphological operation of opening, using a sphere, on a "volume" class object of "binary" modality. Opening is useful for :

• removing volumes that are smaller than the radius,

• smoothing shapes.

Usage

bin.opening(vol, radius = 10, alias = "", description = NULL)

Value

Returns a "volume" class object of "binary" modality (see espadon.class for class definitions), with the same grid as vol, in which $vol3D.data has been transformed by the opening operation.

Arguments

vol

"volume" class object, of "binary" modality.

radius

Positive number, or xyz-vector of 3 positive numbers. By default, radius = 10.

alias

Character string, $object.alias of the created object.

description

Character string, describing the created object. If description = NULL (default value), it will be set to paste (vol$object.alias, "opening r =", radius).

See Also

bin.dilation, bin.erosion, bin.closing, add.margin, nesting.cube.

Examples

# loading of toy-patient objects (decrease dxyz for better result)
step <- 4
patient <- toy.load.patient (modality = "mr", roi.name = "", 
                             dxyz = rep (step, 3))
MR <- patient$mr[[1]]

# generation of a binary volume
b <- bin.from.vol(MR, min = 15,max = 30)

b.opening <- bin.opening (b, radius = step)
display.plane (bottom = MR, top = b, main = "Before opening", 
               view.coord = -20, interpolate = FALSE)
display.plane (bottom = MR, top = b.opening, main = "After opening", 
               view.coord = -20, interpolate = FALSE)