Specify scales, resize, and/or define focal objects within images.
procimg(image, resize = NULL, rotate = NULL, scaledist = NULL,
outline = FALSE, smooth = FALSE, iterations = 1L, col = "red",
plotnew = FALSE, ...)
(required) image data. Either a single image array, or a number of images
stored in a list. Preferably the result of getimg
.
an integer specifying the scaling factor for linearly resizing images, if so desired. E.g. 0.5 to half the size of an image, or 2 to double it.
an integer specifying the angle of image rotation, in degrees. Images are rotated around the centre, and linearly interpolated.
an integer, or numeric vector equal in length to the number of images, specifying the length of the scale in the image(s). Image(s) will then be presented, and the user asked to select either end of the scale corresponding to the input value.
interactively specify the focal object in an image by clicking around its outline. The xy-coordinates of the resulting closed polygon are saved as an attribute, for use in genrating a masking layer & separating animals/plants from backgrounds in further analyses. This is particularly useful when backgrounds are complex, such as in natural settings.
should the polygon specified when outline = TRUE
be smoothed
using Chaikin's corner-cuting algorithm? Defaults to FALSE
.
the number of smoothing iterations, when smooth = TRUE
.
Defaults to 1
.
the color of the marker points and/or line, when using interactive options.
should plots be opened in a new window? Defaults to FALSE
.
additional graphical parameters. Also see par
.
an image, or list of images, for use in further
pavo
functions.
Chaikin, G. 1974. An algorithm for high speed curve generation. Computer Graphics and Image Processing 3, 346-349.
# NOT RUN {
# Single image
papilio <- getimg(system.file("testdata/images/papilio.png", package = 'pavo'))
papilio <- procimg(papilio, scaledist = 10)
# Assign individual scales to each image, after slightly reducing their size.
snakes <- getimg(system.file("testdata/images/snakes", package = 'pavo'))
snakes <- procimg(snakes, scaledist = c(10, 14), resize = 0.95)
# }
# NOT RUN {
# }
Run the code above in your browser using DataLab