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imager (version 0.45.2)

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

6,643

Version

0.45.2

License

LGPL-3

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Repository

https://github.com/asgr/imager/

Homepage

https://asgr.github.io/imager/

Maintainer

Aaron Robotham

Last Published

May 10th, 2023

Functions in imager (0.45.2)

as.igraph.pixset

Form an adjacency graph from a pixset

Compute the bounding box of a pixset

Autocrop image region

as.data.frame.pixset

Methods to convert pixsets to various objects

as.data.frame.imlist

Convert image list to data.frame

Convert a cimg object to a raster object for plotting

Form a graph from an image

Return or set pixel value at coordinates

Convert various objects to image lists

Split a colour image into a list of separate channels

Center stencil at a location

Photograph of sailing boats from Kodak set

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

Find the boundary of a shape in a pixel set

Blur image with a box filter (square window)

Control CImg's parallelisation

Various useful pixsets

Fill in a colour in an area given by a pixset

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

Add circles to plot

Blur image with a box filter.

Concatenation for image lists

Estimate displacement field between two images.

Display object using CImg library

Create a cimg object

Convert cimg to spatstat im object

Methods to convert various objects to pixsets

Correlation/convolution of image by filter

Crop the outer margins of an image

distance_transform

Compute Euclidean distance function to a specified value.

Split a video into separate frames

Flatten alpha channel

Canny edge detector

Draw rectangle on image

Display image using CImg library

cimg.dimensions

Image dimensions

Various shortcuts for extracting colour channels, frames, etc

Display image list using CImg library

Highlight pixel set on image

Circle detection using Hough transform

Draw text on an image

Array subset operator for cimg objects

Replace part of an image with another

Return contours of image/pixset

Capture the current R plot device as a cimg image

Combine a list of images into a single image

Modify parts of an image

Colour space conversions in imager

Combining images

extract_patches

Extract image patches and return a list

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Apply recursive Deriche filter.

Check that value is in a range

Coordinates as images

Shift image content.

Convert an RGB image to grayscale

Grow/shrink a pixel set

Erode/dilate image by a structuring element.

Fill-in NA values in an image

Select image regions interactively

Draw circle on image

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

Coordinates from pixel index

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

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

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

Compute image Laplacian

Load a video using ffmpeg

Build simple interactive interfaces using imager

Compute image hessian.

Return pixel values in a neighbourhood defined by a stencil

Return information on image file

Generate (Gaussian) white-noise image

Compute image gradient.

Return coordinates of subset of pixels

Return image hessian.

Hough transform for lines

Blur image isotropically.

Compute Haar multiscale wavelet transform.

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

Grayscale dimensions of image

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

Draw image on another image

Label connected components.

Pad image with n pixels along specified axis

Type-stable map for use with the purrr package

Make/save a video using ffmpeg

Evaluation in an image context

Plot objects on image using base graphics

px.remove_outer

Remove all connected regions that touch image boundaries

Compute watershed transform.

patch_summary_cimg

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

A pixset for NA values

Return locations in pixel set

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

Create an image of custom size by filling in repeated values

Compute image gradient

Interpolate image values

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

Select a region of homogeneous colour

Plot an image list

Select part of an image

Young-Van Vliet recursive Gaussian filter.

Replicate images

Mirror image content along specified axis

Return image patch summary

Checks that an object is a cimg object

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

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.

Load all images in a directory

Rotate an image along the XY plane.

Linear index in internal vector from pixel coordinates

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

Plot a line, Hesse normal form parameterisation

Check that an object is an imlist object

resize_doubleXY

Resize image uniformly

Check that an object is a pixset object

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

Permute image axes

Load image from file or URL

Pixel sets (pixsets)

Return the pixel grid for an image

Load example image

Threshold grayscale image

A cross-shaped stencil

Display an image using base graphics

Renormalise image

split_connected

Split pixset into connected components

Remove empty dimensions from an array

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

Remove alpha channel and store as attribute

as.data.frame.cimg

Convert a pixel image to a data.frame

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

Convert to cimg object

Convert a raster object to a cimg object

as.cimg.function

Create an image by sampling a function

Turn an numeric array into a cimg object

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

Compute the Discrete Fourier Transform of an image

as.cimg.data.frame

Create an image from a data.frame

Add colour channels to a grayscale image or pixel set