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imager (version 0.42.10)

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

0.42.10

License

LGPL-3

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Repository

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

Homepage

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

Maintainer

Last Published

June 10th, 2021

Functions in imager (0.42.10)

Return or set pixel value at coordinates

Capture the current R plot device as a cimg image

Compute the bounding box of a pixset

Create a cimg object

Crop the outer margins of an image

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

Apply recursive Deriche filter.

cimg.dimensions

Image dimensions

Convert a raster object to a cimg object

Center stencil at a location

Split a video into separate frames

as.igraph.pixset

Form an adjacency graph from a pixset

Blur image with a box filter (square window)

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

Convert various objects to image lists

Blur image with a box filter.

Convert an RGB image to grayscale

Colour space conversions in imager

Check that value is in a range

Return coordinates of subset of pixels

Combining images

Methods to convert various objects to pixsets

as.data.frame.imlist

Convert image list to data.frame

Photograph of sailing boats from Kodak set

Find the boundary of a shape in a pixel set

Compute image hessian.

Convert cimg to spatstat im object

Grow/shrink a pixel set

Draw circle on image

Draw rectangle on image

Fill in a colour in an area given by a pixset

Add circles to plot

Convert a cimg object to a raster object for plotting

Split a colour image into a list of separate channels

Concatenation for image lists

Autocrop image region

Various useful pixsets

Estimate displacement field between two images.

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Compute Haar multiscale wavelet transform.

Return contours of image/pixset

Plot objects on image using base graphics

Return information on image file

Generate (Gaussian) white-noise image

Highlight pixel set on image

Replace part of an image with another

Coordinates from pixel index

Form a graph from an image

as.data.frame.pixset

Methods to convert pixsets to various objects

Display object using CImg library

Correlation/convolution of image by filter

Draw text on an image

Display image using CImg library

Erode/dilate image by a structuring element.

Various shortcuts for extracting colour channels, frames, etc

Canny edge detector

Label connected components.

Blur image isotropically.

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

Circle detection using Hough transform

Hough transform for lines

Array subset operator for cimg objects

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

Combine a list of images into a single image

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

Modify parts of an image

Select image regions interactively

Flatten alpha channel

Select part of an image

Evaluation in an image context

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

Return image hessian.

extract_patches

Extract image patches and return a list

Interpolate image values

Draw image on another image

Grayscale dimensions of image

cimg.use.openmp

Control CImg's parallelisation

distance_transform

Compute Euclidean distance function to a specified value.

Display image list using CImg library

Return pixel values in a neighbourhood defined by a stencil

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.

Compute image gradient

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

Linear index in internal vector from pixel coordinates

Load example image

Shift image content.

Check that an object is an imlist object

Make/save a video using ffmpeg

Checks that an object is a cimg object

Type-stable map for use with the purrr package

Return the pixel grid for an image

Load image from file or URL

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

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

Coordinates as images

patch_summary_cimg

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

Pad image with n pixels along specified axis

Load all images in a directory

Return image patch summary

Replicate images

Rotate an image along the XY plane.

Pixel sets (pixsets)

Select a region of homogeneous colour

Plot an image list

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

Remove empty dimensions from an array

split_connected

Split pixset into connected components

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

Young-Van Vliet recursive Gaussian filter.

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

Load a video using ffmpeg

Check that an object is a pixset object

Compute image Laplacian

Permute image axes

Renormalise image

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

Build simple interactive interfaces using imager

Fill-in NA values in an image

A pixset for NA values

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

Display an image using base graphics

Plot a line, Hesse normal form parameterisation

px.remove_outer

Remove all connected regions that touch image boundaries

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.

Return locations in pixel set

Compute watershed transform.

Mirror image content along specified axis

resize_doubleXY

Resize image uniformly

A cross-shaped stencil

Remove alpha channel and store as attribute

Threshold grayscale image

Compute the Discrete Fourier Transform of an image

Turn an numeric array into a cimg object

as.cimg.data.frame

Create an image from a data.frame

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

as.cimg.function

Create an image by sampling a function

as.data.frame.cimg

Convert a pixel image to a data.frame

Add colour channels to a grayscale image or pixel set

Convert to cimg object