imager v0.42.7

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by Shota Ochi View Source

Image Processing Library Based on 'CImg'

Fast image processing for images in up to 4 dimensions (two spatial dimensions, one time/depth dimension, one colour dimension). Provides most traditional image processing tools (filtering, morphology, transformations, etc.) as well as various functions for easily analysing image data using R. The package wraps 'CImg', <http://cimg.eu>, a simple, modern C++ library for image processing.

Functions in imager

Name	Description
RasterPackage	Convert a RasterLayer/RasterBrick to a cimg image/image list
as.cimg.function	Create an image by sampling a function
as.cimg.data.frame	Create an image from a data.frame
add.colour	Add colour channels to a grayscale image or pixel set
as.data.frame.cimg	Convert a pixel image to a data.frame
as.cimg.raster	Convert a raster object to a cimg object
as.cimg.array	Turn an numeric array into a cimg object
FFT	Compute the Discrete Fourier Transform of an image
bbox	Compute the bounding box of a pixset
as.cimg	Convert to cimg object
as.igraph.cimg	Form a graph from an image
as.data.frame.imlist	Convert image list to data.frame
as.data.frame.pixset	Methods to convert pixsets to various objects
boats	Photograph of sailing boats from Kodak set
colorise	Fill in a colour in an area given by a pixset
boundary	Find the boundary of a shape in a pixel set
clean	Clean up and fill in pixel sets (morphological opening and closing)
at	Return or set pixel value at coordinates
autocrop	Autocrop image region
blur_anisotropic	Blur image anisotropically, in an edge-preserving way.
channels	Split a colour image into a list of separate channels
capture.plot	Capture the current R plot device as a cimg image
flatten.alpha	Flatten alpha channel
deriche	Apply recursive Deriche filter.
crop.borders	Crop the outer margins of an image
extract_patches	Extract image patches and return a list
hough_circle	Circle detection using Hough transform
as.raster.cimg	Convert a cimg object to a raster object for plotting
as.pixset	Methods to convert various objects to pixsets
ci	Concatenation for image lists
center.stencil	Center stencil at a location
hough_line	Hough transform for lines
boxblur	Blur image with a box filter (square window)
as.igraph.pixset	Form an adjacency graph from a pixset
display.list	Display image list using CImg library
cimg2im	Convert cimg to spatstat im object
cannyEdges	Canny edge detector
bucketfill	Bucket fill
common_pixsets	Various useful pixsets
boxblur_xy	Blur image with a box filter.
imager.replace	Replace part of an image with another
cimg.extract	Various shortcuts for extracting colour channels, frames, etc
distance_transform	Compute Euclidean distance function to a specified value.
contours	Return contours of image/pixset
diffusion_tensors	Compute field of diffusion tensors for edge-preserving smoothing.
as.imlist.list	Convert various objects to image lists
cimg.use.openmp	Control CImg's parallelisation
cimg	Create a cimg object
cimg.dimensions	Image dimensions
erode	Erode/dilate image by a structuring element.
displacement	Estimate displacement field between two images.
draw_text	Draw text on an image
frames	Split a video into separate frames
imcoord	Coordinates as images
imager.subset	Array subset operator for cimg objects
display	Display object using CImg library
coord.index	Coordinates from pixel index
circles	Add circles to plot
correlate	Correlation/convolution of image by filter
get.locations	Return coordinates of subset of pixels
get_gradient	Compute image gradient.
get.stencil	Return pixel values in a neighbourhood defined by a stencil
haar	Compute Haar multiscale wavelet transform.
draw_rect	Draw rectangle on image
draw_circle	Draw circle on image
interp	Interpolate image values
make.video	Make/save a video using ffmpeg
is.cimg	Checks that an object is a cimg object
imdirac	Generates a "dirac" image, i.e. with all values set to 0 except one.
display.cimg	Display image using CImg library
pixel.grid	Return the pixel grid for an image
map_il	Type-stable map for use with the purrr package
highlight	Highlight pixel set on image
im_split	Split an image along a certain axis (producing a list)
%inr%	Check that value is in a range
grow	Grow/shrink a pixel set
grayscale	Convert an RGB image to grayscale
gsdim	Grayscale dimensions of image
RGBtoHSL	Colour space conversions in imager
imager.combine	Combining images
pixset	Pixel sets (pixsets)
plot.imlist	Plot an image list
imsplit	Split an image along a certain axis (producing a list)
imhessian	Compute image hessian.
iminfo	Return information on image file
imfill	Create an image of custom size by filling in repeated values
imgradient	Compute image gradient
get_hessian	Return image hessian.
grab	Select image regions interactively
imager	imager: an R library for image processing, based on CImg
imlap	Compute image Laplacian
px.flood	Select a region of homogeneous colour
iiply	Split an image, apply function, recombine the results as an image
idply	Split an image along axis, map function, return a data.frame
imshift	Shift image content.
imsharpen	Sharpen image.
im2cimg	Convert an image in spatstat format to an image in cimg format
imdraw	Draw image on another image
ilply	Split an image along axis, apply function, return a list
isoblur	Blur image isotropically.
imsub	Select part of an image
imappend	Combine a list of images into a single image
is.imlist	Check that an object is an imlist object
medianblur	Blur image with the median filter. In a window of size n x n centered at pixel (x,y), compute median pixel value over the window. Optionally, ignore values that are too far from the value at current pixel.
is.pixset	Check that an object is a pixset object
mirror	Mirror image content along specified axis
label	Label connected components.
imeval	Evaluation in an image context
save.image	Save image
rotate_xy	Rotate image by an arbitrary angle, around a center point.
patchstat	Return image patch summary
imchange	Modify parts of an image
load.video	Load a video using ffmpeg
imrotate	Rotate an image along the XY plane.
imrep	Replicate images
magick	Convert a magick image to a cimg image or image list and vice versa
renorm	Renormalise image
split_connected	Split pixset into connected components
periodic.part	Compute the periodic part of an image, using the periodic/smooth decomposition of Moisan (2011)
imlist	Image list
load.example	Load example image
imwarp	Image warping
squeeze	Remove empty dimensions from an array
resize	Resize image
pad	Pad image with n pixels along specified axis
px.na	A pixset for NA values
warp	Warp image
liply	Apply function to each element of a list, then combine the result as an image by appending along specified axis
index.coord	Linear index in internal vector from pixel coordinates
patch_summary_cimg	Extract a numerical summary from image patches, using CImg's mini-language Experimental feature.
vanvliet	Young-Van Vliet recursive Gaussian filter.
load.image	Load image from file or URL
px.remove_outer	Remove all connected regions that touch image boundaries
load.dir	Load all images in a directory
imnoise	Generate (Gaussian) white-noise image
mutate_plyr	Mutate a data frame by adding new or replacing existing columns.
nfline	Plot a line, Hesse normal form parameterisation
plot.cimg	Display an image using base graphics
where	Return locations in pixel set
play	Play a video
watershed	Compute watershed transform.
implot	Plot objects on image using base graphics
inpaint	Fill-in NA values in an image
permute_axes	Permute image axes
interact	Build simple interactive interfaces using imager
%>%	Pipe operator
resize_doubleXY	Resize image uniformly
rm.alpha	Remove alpha channel and store as attribute
threshold	Threshold grayscale image
stencil.cross	A cross-shaped stencil
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Vignettes of imager

Name
gettingstarted.Rmd
pixsets.Rmd
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Details

Type	Package
License	LGPL-3
URL	http://dahtah.github.io/imager/, https://github.com/dahtah/imager/
BugReports	https://github.com/dahtah/imager/issues
SystemRequirements	fftw3,libtiff,C++11,X11
LinkingTo	Rcpp
LazyData	true
RoxygenNote	7.1.1
VignetteBuilder	knitr
NeedsCompilation	yes
Packaged	2021-01-26 00:58:19 UTC; tanuki
Repository	CRAN
Date/Publication	2021-02-23 12:20:21 UTC

suggests	Cairo , dplyr , ggplot2 , knitr , magick , OpenMPController , raster , rmarkdown , scales , spatstat , testthat
imports	downloader , grDevices , igraph , jpeg , methods , png , purrr , Rcpp (>= 0.11.5) , readbitmap , stringr
depends	magrittr , R (>= 2.10.0)
Contributors	Simon Barthelme, Jan Wijffels, David Tschumperle, Haz Edine Assemlal