imager

Compute the Discrete Fourier Transform of an image

Convert a RasterLayer/RasterBrick to a cimg image/image list

Add colour channels to a grayscale image or pixel set

Convert to cimg object

Turn an numeric array into a cimg object

Create an image from a data.frame

Create an image by sampling a function

Convert a raster object to a cimg object

Convert a pixel image to a data.frame

Convert image list to data.frame

Methods to convert pixsets to various objects

Form a graph from an image

Form an adjacency graph from a pixset

Convert various objects to image lists

Methods to convert various objects to pixsets

Convert a cimg object to a raster object for plotting

Return or set pixel value at coordinates

Autocrop image region

Compute the bounding box of a pixset

Blur image anisotropically, in an edge-preserving way.

Photograph of sailing boats from Kodak set

Find the boundary of a shape in a pixel set

Blur image with a box filter (square window)

Blur image with a box filter.

Bucket fill

Canny edge detector

Capture the current R plot device as a cimg image

Center stencil at a location

Split a colour image into a list of separate channels

Concatenation for image lists

Create a cimg object

Image dimensions

Various shortcuts for extracting colour channels, frames, etc

Control CImg's parallelisation

Convert cimg to spatstat im object

Add circles to plot

Clean up and fill in pixel sets (morphological opening and closing)

Fill in a colour in an area given by a pixset

Various useful pixsets

Return contours of image/pixset

Coordinates from pixel index

Correlation/convolution of image by filter

Crop the outer margins of an image

Apply recursive Deriche filter.

Compute field of diffusion tensors for edge-preserving smoothing.

Estimate displacement field between two images.

Display object using CImg library

Display image using CImg library

Display image list using CImg library

Compute Euclidean distance function to a specified value.

Draw circle on image

Draw rectangle on image

Draw text on an image

Erode/dilate image by a structuring element.

Extract image patches and return a list

Flatten alpha channel

Split a video into separate frames

Return coordinates of subset of pixels

Return pixel values in a neighbourhood defined by a stencil

Compute image gradient.

Return image hessian.

Select image regions interactively

Check that value is in a range

Convert an RGB image to grayscale

Grow/shrink a pixel set

Grayscale dimensions of image

Compute Haar multiscale wavelet transform.

Highlight pixel set on image

Circle detection using Hough transform

Hough transform for lines

Split an image along axis, map function, return a data.frame

Split an image, apply function, recombine the results as an image

Split an image along axis, apply function, return a list

Convert an image in spatstat format to an image in cimg format

Split an image along a certain axis (producing a list)

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

Colour space conversions in imager

Combining images

Replace part of an image with another

Array subset operator for cimg objects

Combine a list of images into a single image

Modify parts of an image

Coordinates as images

Generates a "dirac" image, i.e. with all values set to 0 except one.

Draw image on another image

Evaluation in an image context

Create an image of custom size by filling in repeated values

Compute image gradient

Compute image hessian.

Return information on image file

Compute image Laplacian

Image list

Generate (Gaussian) white-noise image

Plot objects on image using base graphics

Replicate images

Rotate an image along the XY plane.

Sharpen image.

Shift image content.

Split an image along a certain axis (producing a list)

Select part of an image

Image warping

Linear index in internal vector from pixel coordinates

Fill-in NA values in an image

Build simple interactive interfaces using imager

Interpolate image values

Checks that an object is a cimg object

Check that an object is an imlist object

Check that an object is a pixset object

Blur image isotropically.

Label connected components.

Apply function to each element of a list, then combine the result as an image by appending along specified axis

Load all images in a directory

Load example image

Load image from file or URL

Load a video using ffmpeg

Convert a magick image to a cimg image or image list and vice versa

Make/save a video using ffmpeg

Type-stable map for use with the purrr package

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 image content along specified axis

Mutate a data frame by adding new or replacing existing columns.

Plot a line, Hesse normal form parameterisation

Pad image with n pixels along specified axis

Extract a numerical summary from image patches, using CImg's mini-language Experimental feature.

Return image patch summary

Compute the periodic part of an image, using the periodic/smooth decomposition of Moisan (2011)

Permute image axes

Pipe operator

Return the pixel grid for an image

Pixel sets (pixsets)

Play a video

Display an image using base graphics

Plot an image list

Select a region of homogeneous colour

A pixset for NA values

Remove all connected regions that touch image boundaries

Renormalise image

Resize image

Resize image uniformly

Remove alpha channel and store as attribute

Rotate image by an arbitrary angle, around a center point.

Save image

Split pixset into connected components

Remove empty dimensions from an array

A cross-shaped stencil

Threshold grayscale image

Young-Van Vliet recursive Gaussian filter.

Warp image

Compute watershed transform.

Return locations in pixel set