imager: index.coord – R documentation

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index.coord

Linear index in internal vector from pixel coordinates

Pixels are stored linearly in (x,y,z,c) order. This function computes the vector index of a pixel given its coordinates

index.coord(im, coords, outside = "stop")

`im`	an image
`coords`	a data.frame with values x,y,z (optional), c (optional)
`outside`	what to do if some coordinates are outside the image: "stop" issues error, "NA" replaces invalid coordinates with NAs. Default: "stop".

a vector of indices (NA if the indices are invalid)

Simon Barthelme

im <- as.cimg(function(x,y) x+y,100,100)
px <- index.coord(im,data.frame(x=c(3,3),y=c(1,2)))
im[px] #Values should be 3+1=4, 3+2=5

Image Processing Library Based on 'CImg'

v0.42.10

LGPL-3

Authors

Simon Barthelme [aut], David Tschumperle [ctb], Jan Wijffels [ctb], Haz Edine Assemlal [ctb], Shota Ochi [cre]

Initial release