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imager (version 0.42.19)

Image Processing Library Based on 'CImg'

Description

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', , a simple, modern C++ library for image processing.

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Install

install.packages('imager')

Monthly Downloads

9,194

Version

0.42.19

License

LGPL-3

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Repository

https://github.com/dahtah/imager/

Homepage

http://dahtah.github.io/imager/

Maintainer

Last Published

March 25th, 2023

Functions in imager (0.42.19)

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

as.data.frame.imlist

Convert image list to data.frame

Add colour channels to a grayscale image or pixel set

Compute the Discrete Fourier Transform of an image

as.data.frame.cimg

Convert a pixel image to a data.frame

as.cimg.function

Create an image by sampling a function

Convert a raster object to a cimg object

Turn an numeric array into a cimg object

as.cimg.data.frame

Create an image from a data.frame

Convert to cimg object

Return or set pixel value at coordinates

as.data.frame.pixset

Methods to convert pixsets to various objects

Methods to convert various objects to pixsets

Split a colour image into a list of separate channels

Autocrop image region

Compute the bounding box of a pixset

Convert a cimg object to a raster object for plotting

Canny edge detector

Concatenation for image lists

Find the boundary of a shape in a pixel set

as.igraph.pixset

Form an adjacency graph from a pixset

Convert various objects to image lists

Photograph of sailing boats from Kodak set

Fill in a colour in an area given by a pixset

Capture the current R plot device as a cimg image

Center stencil at a location

Form a graph from an image

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

Convert cimg to spatstat im object

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

Various shortcuts for extracting colour channels, frames, etc

Blur image with a box filter.

Blur image with a box filter (square window)

Display object using CImg library

Create a cimg object

Display image using CImg library

cimg.dimensions

Image dimensions

Add circles to plot

Correlation/convolution of image by filter

Coordinates from pixel index

Draw text on an image

Draw circle on image

Display image list using CImg library

Erode/dilate image by a structuring element.

distance_transform

Compute Euclidean distance function to a specified value.

Various useful pixsets

Compute Haar multiscale wavelet transform.

extract_patches

Extract image patches and return a list

Split a video into separate frames

cimg.use.openmp

Control CImg's parallelisation

Estimate displacement field between two images.

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Check that value is in a range

Return coordinates of subset of pixels

Replace part of an image with another

Highlight pixel set on image

Draw rectangle on image

Return contours of image/pixset

Crop the outer margins of an image

Apply recursive Deriche filter.

Colour space conversions in imager

Combine a list of images into a single image

Draw image on another image

Convert an RGB image to grayscale

Evaluation in an image context

Combining images

Modify parts of an image

Compute image hessian.

Array subset operator for cimg objects

Circle detection using Hough transform

Create an image of custom size by filling in repeated values

Hough transform for lines

Grow/shrink a pixel set

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

Return pixel values in a neighbourhood defined by a stencil

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

Compute image Laplacian

Compute image gradient.

Replicate images

Flatten alpha channel

Grayscale dimensions of image

Linear index in internal vector from pixel coordinates

Select image regions interactively

Return image hessian.

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

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

Load image from file or URL

Load example image

Compute image gradient

Generate (Gaussian) white-noise image

Plot objects on image using base graphics

Blur image isotropically.

Shift image content.

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

Coordinates as images

Check that an object is an imlist object

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

Check that an object is a pixset object

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

Fill-in NA values in an image

Build simple interactive interfaces using imager

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

resize_doubleXY

Resize image uniformly

Label connected components.

Renormalise image

Plot a line, Hesse normal form parameterisation

Remove alpha channel and store as attribute

A cross-shaped stencil

Rotate an image along the XY plane.

Load a video using ffmpeg

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

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

Permute image axes

Load all images in a directory

split_connected

Split pixset into connected components

Remove empty dimensions from an array

Display an image using base graphics

Return information on image file

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

Threshold grayscale image

Mirror image content along specified axis

Select part of an image

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.

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

Pixel sets (pixsets)

A pixset for NA values

px.remove_outer

Remove all connected regions that touch image boundaries

Return the pixel grid for an image

Return image patch summary

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

Compute watershed transform.

Return locations in pixel set

Make/save a video using ffmpeg

Checks that an object is a cimg object

Pad image with n pixels along specified axis

Interpolate image values

Type-stable map for use with the purrr package

Young-Van Vliet recursive Gaussian filter.

patch_summary_cimg

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

Select a region of homogeneous colour

Plot an image list