imager (version 0.42.19)

erode: Erode/dilate image by a structuring element.

Description

Erode/dilate image by a structuring element.

Usage

erode(im, mask, boundary_conditions = TRUE, real_mode = FALSE)
erode_rect(im, sx, sy, sz = 1L)
erode_square(im, size)
dilate(im, mask, boundary_conditions = TRUE, real_mode = FALSE)
dilate_rect(im, sx, sy, sz = 1L)
dilate_square(im, size)
mopening(im, mask, boundary_conditions = TRUE, real_mode = FALSE)
mopening_square(im, size)
mclosing_square(im, size)
mclosing(im, mask, boundary_conditions = TRUE, real_mode = FALSE)

Arguments

im

an image

mask

Structuring element.

boundary_conditions

Boundary conditions. If FALSE, pixels beyond image boundaries are considered to be 0, if TRUE one. Default: TRUE.

real_mode

If TRUE, perform erosion as defined on the reals. If FALSE, perform binary erosion (default FALSE).

sx

Width of the structuring element.

sy

Height of the structuring element.

sz

Depth of the structuring element.

size

size of the structuring element.

Functions

• erode_rect(): Erode image by a rectangular structuring element of specified size.

• erode_square(): Erode image by a square structuring element of specified size.

• dilate(): Dilate image by a structuring element.

• dilate_rect(): Dilate image by a rectangular structuring element of specified size

• dilate_square(): Dilate image by a square structuring element of specified size

• mopening(): Morphological opening (erosion followed by dilation)

• mopening_square(): Morphological opening by a square element (erosion followed by dilation)

• mclosing_square(): Morphological closing by a square element (dilation followed by erosion)

• mclosing(): Morphological closing (dilation followed by erosion)

Examples

fname <- system.file('extdata/Leonardo_Birds.jpg',package='imager')
im <- load.image(fname) %>% grayscale
outline <- threshold(-im,"95%")
plot(outline)
mask <- imfill(5,10,val=1) #Rectangular mask
plot(erode(outline,mask))
plot(erode_rect(outline,5,10)) #Same thing
plot(erode_square(outline,5)) 
plot(dilate(outline,mask))
plot(dilate_rect(outline,5,10))
plot(dilate_square(outline,5))