cimg.extract: Various shortcuts for extracting colour channels, frames, etc

In imager: Image Processing Library Based on 'CImg'

Various shortcuts for extracting colour channels, frames, etc

Description

Various shortcuts for extracting colour channels, frames, etc

Extract one frame out of a 4D image/video

Usage

frame(im, index)

imcol(im, x)

imrow(im, y)

channel(im, ind)

R(im)

G(im)

B(im)

Arguments

im	an image
index	frame index
x	x coordinate of the row
y	y coordinate of the row
ind	channel index

Functions

• frame(): Extract frame

• imcol(): Extract a particular column from an image

• imrow(): Extract a particular row from an image

• channel(): Extract an image channel

• R(): Extract red channel

• G(): Extract green channel

• B(): Extract blue channel

Author(s)

Simon Barthelme

Examples

#Extract the red channel from the boats image, then the first row, plot
rw <- R(boats) %>% imrow(10)
plot(rw,type="l",xlab="x",ylab="Pixel value")
#Note that R(boats) returns an image
R(boats)
#while imrow returns a vector or a list
R(boats) %>% imrow(1) %>% str
imrow(boats,1) %>% str

imager documentation built on May 29, 2024, 1:38 a.m.