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imager (version 0.42.3)

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

12,098

Version

0.42.3

License

LGPL-3

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Repository

https://github.com/dahtah/imager

Homepage

http://dahtah.github.io/imager

Maintainer

Shota Ochi

Last Published

May 11th, 2020

Functions in imager (0.42.3)

Return or set pixel value at coordinates

Convert a cimg object to a raster object for plotting

Methods to convert various objects to pixsets

Canny edge detector

Various useful pixsets

Form a graph from an image

Blur image with a box filter (square window)

as.data.frame.pixset

Methods to convert pixsets to various objects

Return contours of image/pixset

Autocrop image region

Convert cimg to spatstat im object

Blur image with a box filter.

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

Capture the current R plot device as a cimg image

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

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

Find the boundary of a shape in a pixel set

Compute the bounding box of a pixset

Photograph of sailing boats from Kodak set

Fill in a colour in an area given by a pixset

as.igraph.pixset

Form an adjacency graph from a pixset

Add circles to plot

Display object using CImg library

Convert various objects to image lists

Display image list using CImg library

distance_transform

Compute Euclidean distance function to a specified value.

Return pixel values in a neighbourhood defined by a stencil

Center stencil at a location

Various shortcuts for extracting colour channels, frames, etc

Apply recursive Deriche filter.

Split a colour image into a list of separate channels

cimg.use.openmp

Control CImg's parallelisation

Display image using CImg library

Crop the outer margins of an image

extract_patches

Extract image patches and return a list

Compute image gradient.

Return image hessian.

Select image regions interactively

Coordinates from pixel index

Replicate images

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

Evaluation in an image context

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

Rotate an image along the XY plane.

Draw image on another image

Concatenation for image lists

Create a cimg object

Correlation/convolution of image by filter

Flatten alpha channel

Fill-in NA values in an image

Load image from file or URL

Young-Van Vliet recursive Gaussian filter.

Plot an image list

Build simple interactive interfaces using imager

Select a region of homogeneous colour

Permute image axes

Load example image

cimg.dimensions

Image dimensions

Draw text on an image

Compute Haar multiscale wavelet transform.

Draw circle on image

Highlight pixel set on image

Grayscale dimensions of image

Grow/shrink a pixel set

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

Coordinates as images

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

Erode/dilate image by a structuring element.

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

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

Draw rectangle on image

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

Compute image Laplacian

Compute image hessian.

Check that an object is an imlist object

Check that an object is a pixset object

Check that value is in a range

Convert an RGB image to grayscale

Replace part of an image with another

Make/save a video using ffmpeg

Type-stable map for use with the purrr package

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

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

Return information on image file

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

Plot a line, Hesse normal form parameterisation

Remove alpha channel and store as attribute

resize_doubleXY

Resize image uniformly

Select part of an image

Estimate displacement field between two images.

Interpolate image values

Mirror image content along specified axis

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.

patch_summary_cimg

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

Checks that an object is a cimg object

split_connected

Split pixset into connected components

Renormalise image

Remove empty dimensions from an array

Return coordinates of subset of pixels

Create an image of custom size by filling in repeated values

Split a video into separate frames

Colour space conversions in imager

Combining images

Circle detection using Hough transform

Compute image gradient

Hough transform for lines

Combine a list of images into a single image

Generate (Gaussian) white-noise image

Array subset operator for cimg objects

Linear index in internal vector from pixel coordinates

Modify parts of an image

A cross-shaped stencil

Plot objects on image using base graphics

Threshold grayscale image

Load a video using ffmpeg

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

Return image patch summary

Shift image content.

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

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

Label connected components.

Blur image isotropically.

Load all images in a directory

Return the pixel grid for an image

A pixset for NA values

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

Pixel sets (pixsets)

px.remove_outer

Remove all connected regions that touch image boundaries

Compute watershed transform.

Display an image using base graphics

Return locations in pixel set

Turn an numeric array into a cimg object

Compute the Discrete Fourier Transform of an image

as.data.frame.cimg

Convert a pixel image to a data.frame

Convert a raster object to a cimg object

Add colour channels to a grayscale image or pixel set

as.cimg.function

Create an image by sampling a function

Convert to cimg object

as.cimg.data.frame

Create an image from a data.frame

as.data.frame.imlist

Convert image list to data.frame