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Show pixel intensities

Source: R/methods.R
roi_check.Rd

Show the pixel intensities of certain image channels

Usage

roi_check(img, ind = c(1, 2))

Arguments

img

A cimg object or a list of multiple images such as the one returned from roi_select

ind

A numeric object of length two. For the channel indexes. or a list of similar vectors for each of img items.

Details

Calling this function returns two plots. The first is a scatter plot of the pixel intensities from two channels. The second is the density distribution of the intensities from the two channels.

Examples

# load images
fl <- system.file('extdata', 'Image0001_.jpg', package = 'colocr')
img <- image_load(fl)

# choose ROI and show the pixel intensities
oldpar <- par()
par(mfrow = c(1, 2))

roi_select(img, threshold = 90) %>%
  roi_check()


par(oldpar)
#> Warning: graphical parameter "cin" cannot be set
#> Warning: graphical parameter "cra" cannot be set
#> Warning: graphical parameter "csi" cannot be set
#> Warning: graphical parameter "cxy" cannot be set
#> Warning: graphical parameter "din" cannot be set
#> Warning: graphical parameter "page" cannot be set