Image Processing Library Based on 'CImg'

Documentation for package ‘imager’ version 1.0.2

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imager: an R library for image processing, based on CImg

-- A --

add	Combining images
add.color	Add colour channels to a grayscale image or pixel set
add.colour	Add colour channels to a grayscale image or pixel set
as.cimg	Convert to cimg object
as.cimg.array	Turn an numeric array into a cimg object
as.cimg.cimg	Convert to cimg object
as.cimg.data.frame	Create an image from a data.frame
as.cimg.double	Convert to cimg object
as.cimg.function	Create an image by sampling a function
as.cimg.im	Convert an image in spatstat format to an image in cimg format
as.cimg.logical	Convert to cimg object
as.cimg.matrix	Convert to cimg object
as.cimg.numeric	Convert to cimg object
as.cimg.pixset	Methods to convert various objects to pixsets
as.cimg.raster	Convert a raster object to a cimg object
as.cimg.RasterLayer	Convert a RasterLayer/RasterBrick to a cimg image/image list
as.cimg.vector	Convert to cimg object
as.data.frame.cimg	Convert a pixel image to a data.frame
as.data.frame.imlist	Convert image list to data.frame
as.data.frame.pixset	Methods to convert pixsets to various objects
as.igraph.cimg	Form a graph from an image
as.igraph.pixset	Form an adjacency graph from a pixset
as.imlist	Convert various objects to image lists
as.imlist.cimg	Convert various objects to image lists
as.imlist.imlist	Convert various objects to image lists
as.imlist.list	Convert various objects to image lists
as.imlist.RasterStackBrick	Convert a RasterLayer/RasterBrick to a cimg image/image list
as.pixset	Methods to convert various objects to pixsets
as.pixset.cimg	Methods to convert various objects to pixsets
as.raster.cimg	Convert a cimg object to a raster object for plotting
at	Return or set pixel value at coordinates
at<-	Return or set pixel value at coordinates
autocrop	Autocrop image region
average	Combining images

-- B --

B	Various shortcuts for extracting colour channels, frames, etc
B<-	Replace part of an image with another
bbox	Compute the bounding box of a pixset
blur_anisotropic	Blur image anisotropically, in an edge-preserving way.
boats	Photograph of sailing boats from Kodak set
boundary	Find the boundary of a shape in a pixel set
boxblur	Blur image with a box filter (square window)
boxblur_xy	Blur image with a box filter.
bucketfill	Bucket fill

-- C --

cannyEdges	Canny edge detector
capture.plot	Capture the current R plot device as a cimg image
Cc	Coordinates as images
center.stencil	Center stencil at a location
channel	Various shortcuts for extracting colour channels, frames, etc
channel<-	Replace part of an image with another
channels	Split a colour image into a list of separate channels
ci	Concatenation for image lists
cimg	Create a cimg object
cimg.dimensions	Image dimensions
cimg.extract	Various shortcuts for extracting colour channels, frames, etc
cimg.limit.openmp	Control CImg's parallelisation
cimg.openmp	Control CImg's parallelisation
cimg.use.openmp	Control CImg's parallelisation
cimg2im	Convert cimg to spatstat im object
cimg2magick	Convert a magick image to a cimg image or image list and vice versa
circles	Add circles to plot
clean	Clean up and fill in pixel sets (morphological opening and closing)
color.at	Return or set pixel value at coordinates
color.at<-	Return or set pixel value at coordinates
colorise	Fill in a colour in an area given by a pixset
common_pixsets	Various useful pixsets
contours	Return contours of image/pixset
convert_pixset	Methods to convert pixsets to various objects
convolve	Correlation/convolution of image by filter
coord.index	Coordinates from pixel index
correlate	Correlation/convolution of image by filter
crop.bbox	Compute the bounding box of a pixset
crop.borders	Crop the outer margins of an image

-- D --

depth	Image dimensions
deriche	Apply recursive Deriche filter.
diffusion_tensors	Compute field of diffusion tensors for edge-preserving smoothing.
dilate	Erode/dilate image by a structuring element.
dilate_rect	Erode/dilate image by a structuring element.
dilate_square	Erode/dilate image by a structuring element.
displacement	Estimate displacement field between two images.
display	Display object using CImg library
display.cimg	Display image using CImg library
display.list	Display image list using CImg library
distance_transform	Compute Euclidean distance function to a specified value.
draw_circle	Draw circle on image
draw_rect	Draw rectangle on image
draw_text	Draw text on an image

-- E --

enorm	Combining images
equal	Combining images
erode	Erode/dilate image by a structuring element.
erode_rect	Erode/dilate image by a structuring element.
erode_square	Erode/dilate image by a structuring element.
extract_patches	Extract image patches and return a list
extract_patches3D	Extract image patches and return a list

-- F --

FFT	Compute the Discrete Fourier Transform of an image
fill	Clean up and fill in pixel sets (morphological opening and closing)
flatten.alpha	Flatten alpha channel
frame	Various shortcuts for extracting colour channels, frames, etc
frame<-	Replace part of an image with another
frames	Split a video into separate frames

-- G --

G	Various shortcuts for extracting colour channels, frames, etc
G<-	Replace part of an image with another
get.locations	Return coordinates of subset of pixels
get.stencil	Return pixel values in a neighbourhood defined by a stencil
get_gradient	Compute image gradient.
get_hessian	Return image hessian.
grab	Select image regions interactively
grabLine	Select image regions interactively
grabPoint	Select image regions interactively
grabRect	Select image regions interactively
grayscale	Convert an RGB image to grayscale
grow	Grow/shrink a pixel set
gsdim	Grayscale dimensions of image

-- H --

haar	Compute Haar multiscale wavelet transform.
height	Image dimensions
highlight	Highlight pixel set on image
hough_circle	Circle detection using Hough transform
hough_line	Hough transform for lines
HSItoRGB	Colour space conversions in imager
HSLtoRGB	Colour space conversions in imager
HSVtoRGB	Colour space conversions in imager

-- I --

idply	Split an image along axis, map function, return a data.frame
iiply	Split an image, apply function, recombine the results as an image
ilply	Split an image along axis, apply function, return a list
imager	imager: an R library for image processing, based on CImg
imager.colourspaces	Colour space conversions in imager
imager.combine	Combining images
imager.replace	Replace part of an image with another
imager.subset	Array subset operator for cimg objects
imappend	Combine a list of images into a single image
imchange	Modify parts of an image
imcol	Various shortcuts for extracting colour channels, frames, etc
imcoord	Coordinates as images
imdirac	Generates a "dirac" image, i.e. with all values set to 0 except one.
imdo	Evaluation in an image context
imdraw	Draw image on another image
imeval	Evaluation in an image context
imfill	Create an image of custom size by filling in repeated values
imgradient	Compute image gradient
imhessian	Compute image hessian.
iminfo	Return information on image file
imlap	Compute image Laplacian
imlist	Image list
imnoise	Generate (Gaussian) white-noise image
implot	Plot objects on image using base graphics
imrep	Replicate images
imresize	Resize image uniformly
imrotate	Rotate an image along the XY plane.
imrow	Various shortcuts for extracting colour channels, frames, etc
imsharpen	Sharpen image.
imshift	Shift image content.
imsplit	Split an image along a certain axis (producing a list)
imsub	Select part of an image
imwarp	Image warping
im_split	Split an image along a certain axis (producing a list)
index.coord	Linear index in internal vector from pixel coordinates
inpaint	Fill-in NA values in an image
interact	Build simple interactive interfaces using imager
interp	Interpolate image values
is.cimg	Checks that an object is a cimg object
is.imlist	Check that an object is an imlist object
is.pixset	Check that an object is a pixset object
isoblur	Blur image isotropically.

-- L --

label	Label connected components.
LabtoRGB	Colour space conversions in imager
LabtosRGB	Colour space conversions in imager
LabtoXYZ	Colour space conversions in imager
liply	Apply function to each element of a list, then combine the result as an image by appending along specified axis
load.dir	Load all images in a directory
load.example	Load example image
load.image	Load image from file or URL
load.video	Load a video using ffmpeg

-- M --

magick	Convert a magick image to a cimg image or image list and vice versa
magick2cimg	Convert a magick image to a cimg image or image list and vice versa
magick2imlist	Convert a magick image to a cimg image or image list and vice versa
make.video	Make/save a video using ffmpeg
map2_il	Type-stable map for use with the purrr package
map_il	Type-stable map for use with the purrr package
mclosing	Erode/dilate image by a structuring element.
mclosing_square	Erode/dilate image by a structuring element.
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.
mirror	Mirror image content along specified axis
mopening	Erode/dilate image by a structuring element.
mopening_square	Erode/dilate image by a structuring element.
mult	Combining images
mutate_plyr	Mutate a data frame by adding new or replacing existing columns.

-- N --

nfline	Plot a line, Hesse normal form parameterisation
nPix	Image dimensions

-- P --

pad	Pad image with n pixels along specified axis
parall	Combining images
parany	Combining images
parmax	Combining images
parmax.abs	Combining images
parmed	Combining images
parmin	Combining images
parmin.abs	Combining images
parorder	Combining images
parquan	Combining images
parrank	Combining images
parsd	Combining images
parsort	Combining images
parvar	Combining images
patchstat	Return image patch summary
patch_summary_cimg	Extract a numerical summary from image patches, using CImg's mini-language Experimental feature.
periodic.part	Compute the periodic part of an image, using the periodic/smooth decomposition of Moisan (2011)
permute_axes	Permute image axes
pixel.grid	Return the pixel grid for an image
pixset	Pixel sets (pixsets)
play	Play a video
plot.cimg	Display an image using base graphics
plot.imlist	Plot an image list
pmap_il	Type-stable map for use with the purrr package
px.all	Various useful pixsets
px.borders	Various useful pixsets
px.bottom	Various useful pixsets
px.circle	Various useful pixsets
px.diamond	Various useful pixsets
px.flood	Select a region of homogeneous colour
px.left	Various useful pixsets
px.na	A pixset for NA values
px.none	Various useful pixsets
px.remove_outer	Remove all connected regions that touch image boundaries
px.right	Various useful pixsets
px.square	Various useful pixsets
px.top	Various useful pixsets

-- R --

R	Various shortcuts for extracting colour channels, frames, etc
R<-	Replace part of an image with another
RasterPackage	Convert a RasterLayer/RasterBrick to a cimg image/image list
renorm	Renormalise image
resize	Resize image
resize_doubleXY	Resize image uniformly
resize_halfXY	Resize image uniformly
resize_tripleXY	Resize image uniformly
resize_uniform	Resize image uniformly
RGBtoHSI	Colour space conversions in imager
RGBtoHSL	Colour space conversions in imager
RGBtoHSV	Colour space conversions in imager
RGBtoLab	Colour space conversions in imager
RGBtosRGB	Colour space conversions in imager
RGBtoXYZ	Colour space conversions in imager
RGBtoYCbCr	Colour space conversions in imager
RGBtoYUV	Colour space conversions in imager
rm.alpha	Remove alpha channel and store as attribute
rotate_xy	Rotate image by an arbitrary angle, around a center point.

-- S --

save.image	Save image
save.video	Make/save a video using ffmpeg
shrink	Grow/shrink a pixel set
spectrum	Image dimensions
split_connected	Split pixset into connected components
squeeze	Remove empty dimensions from an array
sRGBtoLab	Colour space conversions in imager
sRGBtoRGB	Colour space conversions in imager
stencil.cross	A cross-shaped stencil
subim	Select part of an image

-- T --

threshold

Threshold grayscale image

-- V --

vanvliet

Young-Van Vliet recursive Gaussian filter.

-- W --

warp	Warp image
watershed	Compute watershed transform.
where	Return locations in pixel set
which.parmax	Combining images
which.parmin	Combining images
width	Image dimensions
wsum	Combining images

-- X --

Xc	Coordinates as images
XYZtoLab	Colour space conversions in imager
XYZtoRGB	Colour space conversions in imager

-- Y --

Yc	Coordinates as images
YCbCrtoRGB	Colour space conversions in imager
YUVtoRGB	Colour space conversions in imager

-- Z --

Zc	Coordinates as images

-- misc --

%inr%

Check that value is in a range