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imager (version 0.42.8)

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

7,520

Version

0.42.8

License

LGPL-3

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Repository

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

Homepage

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

Maintainer

Shota Ochi

Last Published

March 15th, 2021

Functions in imager (0.42.8)

as.cimg.function

Create an image by sampling a function

as.cimg.data.frame

Create an image from a data.frame

Convert to cimg object

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

Add colour channels to a grayscale image or pixel set

Turn an numeric array into a cimg object

Convert a raster object to a cimg object

Compute the Discrete Fourier Transform of an image

as.data.frame.cimg

Convert a pixel image to a data.frame

Return or set pixel value at coordinates

as.data.frame.pixset

Methods to convert pixsets to various objects

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

as.data.frame.imlist

Convert image list to data.frame

Canny edge detector

Compute the bounding box of a pixset

Blur image with a box filter (square window)

Form a graph from an image

Blur image with a box filter.

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

Fill in a colour in an area given by a pixset

Photograph of sailing boats from Kodak set

Coordinates from pixel index

Split a colour image into a list of separate channels

Autocrop image region

Find the boundary of a shape in a pixel set

Convert various objects to image lists

as.igraph.pixset

Form an adjacency graph from a pixset

Add circles to plot

Concatenation for image lists

Convert cimg to spatstat im object

Display image list using CImg library

Methods to convert various objects to pixsets

Compute Haar multiscale wavelet transform.

distance_transform

Compute Euclidean distance function to a specified value.

Highlight pixel set on image

Create a cimg object

Various useful pixsets

Crop the outer margins of an image

Draw circle on image

Return contours of image/pixset

Apply recursive Deriche filter.

Generate (Gaussian) white-noise image

Plot objects on image using base graphics

Circle detection using Hough transform

Hough transform for lines

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

Draw rectangle on image

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

Capture the current R plot device as a cimg image

Center stencil at a location

Convert a cimg object to a raster object for plotting

Coordinates as images

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

Correlation/convolution of image by filter

Display object using CImg library

cimg.dimensions

Image dimensions

Display image using CImg library

Type-stable map for use with the purrr package

Make/save a video using ffmpeg

Estimate displacement field between two images.

cimg.use.openmp

Control CImg's parallelisation

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Various shortcuts for extracting colour channels, frames, etc

Return pixel values in a neighbourhood defined by a stencil

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

Display an image using base graphics

Compute image gradient.

Erode/dilate image by a structuring element.

Select image regions interactively

Draw text on an image

Return image hessian.

Split a video into separate frames

Return coordinates of subset of pixels

Array subset operator for cimg objects

Replace part of an image with another

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

Combine a list of images into a single image

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

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

Modify parts of an image

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

Linear index in internal vector from pixel coordinates

Return image patch summary

Load all images in a directory

Select part of an image

Fill-in NA values in an image

A pixset for NA values

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

px.remove_outer

Remove all connected regions that touch image boundaries

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

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.

Build simple interactive interfaces using imager

Mirror image content along specified axis

A cross-shaped stencil

extract_patches

Extract image patches and return a list

Compute image gradient

Compute image Laplacian

Create an image of custom size by filling in repeated values

Flatten alpha channel

Renormalise image

Check that value is in a range

Colour space conversions in imager

Combining images

Convert an RGB image to grayscale

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

Grow/shrink a pixel set

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

Grayscale dimensions of image

Threshold grayscale image

Compute image hessian.

Check that an object is a pixset object

Return the pixel grid for an image

Check that an object is an imlist object

Shift image content.

Return information on image file

Interpolate image values

Pixel sets (pixsets)

Load example image

Checks that an object is a cimg object

Load image from file or URL

Return locations in pixel set

Select a region of homogeneous colour

Plot an image list

Compute watershed transform.

resize_doubleXY

Resize image uniformly

Plot a line, Hesse normal form parameterisation

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

Remove alpha channel and store as attribute

Evaluation in an image context

Draw image on another image

Rotate an image along the XY plane.

Replicate images

Load a video using ffmpeg

Blur image isotropically.

Label connected components.

Young-Van Vliet recursive Gaussian filter.

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

Permute image axes

split_connected

Split pixset into connected components

Remove empty dimensions from an array