imager (version 0.42.19)

imsplit: Split an image along a certain axis (producing a list)

Description

Use this if you need to process colour channels separately, or frames separately, or rows separately, etc. You can also use it to chop up an image into blocks. Returns an "imlist" object, which is essentially a souped-up list.

Usage

imsplit(im, axis, nb = -1)

Arguments

im

an image

axis

the axis along which to split (for example 'c')

nb

number of objects to split into. if nb=-1 (the default) the maximum number of splits is used, i.e. split(im,"c") produces a list containing all individual colour channels.

See Also

imappend (the reverse operation)

Examples

im <- as.cimg(function(x,y,z) x+y+z,10,10,5)
imsplit(im,"z") #Split along the z axis into a list with 5 elements
imsplit(im,"z",2) #Split along the z axis into two groups
imsplit(boats,"x",-200) %>% plot #Blocks of 200 pix. along x
imsplit(im,"z",2) %>% imappend("z") #Split and reshape into a single image
#You can also split pixsets
imsplit(boats > .5,"c") %>% plot