| Check that value is in a range | %inr% |
| Add colour channels to a grayscale image or pixel set | add.color add.colour |
| Convert to cimg object | as.cimg as.cimg.cimg as.cimg.double as.cimg.logical as.cimg.matrix as.cimg.numeric as.cimg.vector |
| Turn an numeric array into a cimg object | as.cimg.array |
| Create an image from a data.frame | as.cimg.data.frame |
| Create an image by sampling a function | as.cimg.function |
| Convert an image in spatstat format to an image in cimg format | as.cimg.im |
| Convert a raster object to a cimg object | as.cimg.raster |
| Convert a pixel image to a data.frame | as.data.frame.cimg |
| Convert image list to data.frame | as.data.frame.imlist |
| Methods to convert pixsets to various objects | as.data.frame.pixset convert_pixset |
| Form a graph from an image | as.igraph.cimg |
| Form an adjacency graph from a pixset | as.igraph.pixset |
| Convert various objects to image lists | as.imlist as.imlist.cimg as.imlist.imlist as.imlist.list |
| Methods to convert various objects to pixsets | as.cimg.pixset as.pixset as.pixset.cimg |
| Convert a cimg object to a raster object for plotting | as.raster.cimg |
| Return or set pixel value at coordinates | at at<- color.at color.at<- |
| Autocrop image region | autocrop |
| Compute the bounding box of a pixset | bbox crop.bbox |
| Blur image anisotropically, in an edge-preserving way. | blur_anisotropic |
| Photograph of sailing boats from Kodak set | boats |
| Find the boundary of a shape in a pixel set | boundary |
| Blur image with a box filter (square window) | boxblur |
| Blur image with a box filter. | boxblur_xy |
| Bucket fill | bucketfill |
| Canny edge detector | cannyEdges |
| Capture the current R plot device as a cimg image | capture.plot |
| Center stencil at a location | center.stencil |
| Split a colour image into a list of separate channels | channels |
| Concatenation for image lists | ci |
| Create a cimg object | cimg |
| Image dimensions | cimg.dimensions depth height nPix spectrum width |
| Various shortcuts for extracting colour channels, frames, etc | B channel cimg.extract frame G imcol imrow R |
| Control CImg's parallelisation | cimg.limit.openmp cimg.openmp cimg.use.openmp |
| Convert cimg to spatstat im object | cimg2im |
| Add circles to plot | circles |
| Clean up and fill in pixel sets (morphological opening and closing) | clean fill |
| Fill in a colour in an area given by a pixset | colorise |
| Various useful pixsets | common_pixsets px.all px.borders px.bottom px.circle px.diamond px.left px.none px.right px.square px.top |
| Return contours of image/pixset | contours |
| Coordinates from pixel index | coord.index |
| Correlation/convolution of image by filter | convolve correlate |
| Crop the outer margins of an image | crop.borders |
| Apply recursive Deriche filter. | deriche |
| Compute field of diffusion tensors for edge-preserving smoothing. | diffusion_tensors |
| Estimate displacement field between two images. | displacement |
| Display object using CImg library | display |
| Display image using CImg library | display.cimg |
| Display image list using CImg library | display.list |
| Compute Euclidean distance function to a specified value. | distance_transform |
| Draw circle on image | draw_circle |
| Draw rectangle on image | draw_rect |
| Draw text on an image | draw_text |
| Erode/dilate image by a structuring element. | dilate dilate_rect dilate_square erode erode_rect erode_square mclosing mclosing_square mopening mopening_square |
| Extract image patches and return a list | extract_patches extract_patches3D |
| Compute the Discrete Fourier Transform of an image | FFT |
| Flatten alpha channel | flatten.alpha |
| Split a video into separate frames | frames |
| Compute image gradient. | get_gradient |
| Return image hessian. | get_hessian |
| Return coordinates of subset of pixels | get.locations |
| Return pixel values in a neighbourhood defined by a stencil | get.stencil |
| Select image regions interactively | grab grabLine grabPoint grabRect |
| Convert an RGB image to grayscale | grayscale |
| Grow/shrink a pixel set | grow shrink |
| Grayscale dimensions of image | gsdim |
| Compute Haar multiscale wavelet transform. | haar |
| Highlight pixel set on image | highlight |
| Circle detection using Hough transform | hough_circle |
| Hough transform for lines | hough_line |
| Split an image along axis, map function, return a data.frame | idply |
| Split an image, apply function, recombine the results as an image | iiply |
| Split an image along axis, apply function, return a list | ilply |
| Split an image along a certain axis (producing a list) | im_split |
| imager: an R library for image processing, based on CImg | imager-package imager |
| Combining images | add average enorm equal imager.combine mult parall parany parmax parmax.abs parmed parmin parmin.abs parorder parquan parrank parsd parsort parvar which.parmax which.parmin wsum |
| Replace part of an image with another | B<- channel<- frame<- G<- imager.replace R<- |
| Array subset operator for cimg objects | imager.subset |
| Combine a list of images into a single image | imappend |
| Modify parts of an image | imchange |
| Coordinates as images | Cc imcoord Xc Yc Zc |
| Generates a "dirac" image, i.e. with all values set to 0 except one. | imdirac |
| Draw image on another image | imdraw |
| Evaluation in an image context | imdo imeval |
| Create an image of custom size by filling in repeated values | imfill |
| Compute image gradient | imgradient |
| Compute image hessian. | imhessian |
| Return information on image file | iminfo |
| Compute image Laplacian | imlap |
| Image list | imlist |
| Generate (Gaussian) white-noise image | imnoise |
| Plot objects on image using base graphics | implot |
| Replicate images | imrep |
| Rotate an image along the XY plane. | imrotate |
| Sharpen image. | imsharpen |
| Shift image content. | imshift |
| Split an image along a certain axis (producing a list) | imsplit |
| Select part of an image | imsub subim |
| Image warping | imwarp |
| Linear index in internal vector from pixel coordinates | index.coord |
| Fill-in NA values in an image | inpaint |
| Build simple interactive interfaces using imager | interact |
| Interpolate image values | interp |
| Checks that an object is a cimg object | is.cimg |
| Check that an object is an imlist object | is.imlist |
| Check that an object is a pixset object | is.pixset |
| Blur image isotropically. | isoblur |
| Label connected components. | label |
| Apply function to each element of a list, then combine the result as an image by appending along specified axis | liply |
| Load all images in a directory | load.dir |
| Load example image | load.example |
| Load image from file or URL | load.image |
| Load a video using ffmpeg | load.video |
| Convert a magick image to a cimg image or image list and vice versa | cimg2magick magick magick2cimg magick2imlist |
| Make/save a video using ffmpeg | make.video save.video |
| Type-stable map for use with the purrr package | map2_il map_il pmap_il |
| 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. | medianblur |
| Mirror image content along specified axis | mirror |
| Mutate a data frame by adding new or replacing existing columns. | mutate_plyr |
| Plot a line, Hesse normal form parameterisation | nfline |
| Pad image with n pixels along specified axis | pad |
| Extract a numerical summary from image patches, using CImg's mini-language Experimental feature. | patch_summary_cimg |
| Return image patch summary | patchstat |
| Compute the periodic part of an image, using the periodic/smooth decomposition of Moisan (2011) | periodic.part |
| Permute image axes | permute_axes |
| Return the pixel grid for an image | pixel.grid |
| Pixel sets (pixsets) | pixset |
| Play a video | play |
| Display an image using base graphics | plot.cimg |
| Plot an image list | plot.imlist |
| Select a region of homogeneous colour | px.flood |
| A pixset for NA values | px.na |
| Remove all connected regions that touch image boundaries | px.remove_outer |
| Convert a RasterLayer/RasterBrick to a cimg image/image list | as.cimg.RasterLayer as.imlist.RasterStackBrick RasterPackage |
| Renormalise image | renorm |
| Resize image | resize |
| Resize image uniformly | imresize resize_doubleXY resize_halfXY resize_tripleXY resize_uniform |
| Colour space conversions in imager | HSItoRGB HSLtoRGB HSVtoRGB imager.colourspaces LabtoRGB LabtosRGB LabtoXYZ RGBtoHSI RGBtoHSL RGBtoHSV RGBtoLab RGBtosRGB RGBtoXYZ RGBtoYCbCr RGBtoYUV sRGBtoLab sRGBtoRGB XYZtoLab XYZtoRGB YCbCrtoRGB YUVtoRGB |
| Remove alpha channel and store as attribute | rm.alpha |
| Rotate image by an arbitrary angle, around a center point. | rotate_xy |
| Save image | save.image |
| Split pixset into connected components | split_connected |
| Remove empty dimensions from an array | squeeze |
| A cross-shaped stencil | stencil.cross |
| Threshold grayscale image | threshold |
| Young-Van Vliet recursive Gaussian filter. | vanvliet |
| Warp image | warp |
| Compute watershed transform. | watershed |
| Return locations in pixel set | where |
