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imager (version 0.42.7)

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

7,521

Version

0.42.7

License

LGPL-3

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Repository

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

Homepage

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

Maintainer

Shota Ochi

Last Published

February 23rd, 2021

Functions in imager (0.42.7)

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

as.cimg.function

Create an image by sampling a function

as.cimg.data.frame

Create an image from a data.frame

Add colour channels to a grayscale image or pixel set

as.data.frame.cimg

Convert a pixel image to a data.frame

Convert a raster object to a cimg object

Turn an numeric array into a cimg object

Compute the Discrete Fourier Transform of an image

Compute the bounding box of a pixset

Convert to cimg object

Form a graph from an image

as.data.frame.imlist

Convert image list to data.frame

as.data.frame.pixset

Methods to convert pixsets to various objects

Photograph of sailing boats from Kodak set

Fill in a colour in an area given by a pixset

Find the boundary of a shape in a pixel set

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

Return or set pixel value at coordinates

Autocrop image region

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

Split a colour image into a list of separate channels

Capture the current R plot device as a cimg image

Flatten alpha channel

Apply recursive Deriche filter.

Crop the outer margins of an image

extract_patches

Extract image patches and return a list

Circle detection using Hough transform

Convert a cimg object to a raster object for plotting

Methods to convert various objects to pixsets

Concatenation for image lists

Center stencil at a location

Hough transform for lines

Blur image with a box filter (square window)

as.igraph.pixset

Form an adjacency graph from a pixset

Display image list using CImg library

Convert cimg to spatstat im object

Canny edge detector

Various useful pixsets

Blur image with a box filter.

Replace part of an image with another

Various shortcuts for extracting colour channels, frames, etc

distance_transform

Compute Euclidean distance function to a specified value.

Return contours of image/pixset

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Convert various objects to image lists

cimg.use.openmp

Control CImg's parallelisation

Create a cimg object

cimg.dimensions

Image dimensions

Erode/dilate image by a structuring element.

Estimate displacement field between two images.

Draw text on an image

Split a video into separate frames

Coordinates as images

Array subset operator for cimg objects

Display object using CImg library

Coordinates from pixel index

Add circles to plot

Correlation/convolution of image by filter

Return coordinates of subset of pixels

Compute image gradient.

Return pixel values in a neighbourhood defined by a stencil

Compute Haar multiscale wavelet transform.

Draw rectangle on image

Draw circle on image

Interpolate image values

Make/save a video using ffmpeg

Checks that an object is a cimg object

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

Display image using CImg library

Return the pixel grid for an image

Type-stable map for use with the purrr package

Highlight pixel set on image

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

Check that value is in a range

Grow/shrink a pixel set

Convert an RGB image to grayscale

Grayscale dimensions of image

Colour space conversions in imager

Combining images

Pixel sets (pixsets)

Plot an image list

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

Compute image hessian.

Return information on image file

Create an image of custom size by filling in repeated values

Compute image gradient

Return image hessian.

Select image regions interactively

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

Compute image Laplacian

Select a region of homogeneous colour

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

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

Shift image content.

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

Draw image on another image

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

Blur image isotropically.

Select part of an image

Combine a list of images into a single image

Check that an object is an imlist object

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.

Check that an object is a pixset object

Mirror image content along specified axis

Label connected components.

Evaluation in an image context

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

Return image patch summary

Modify parts of an image

Load a video using ffmpeg

Rotate an image along the XY plane.

Replicate images

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

Renormalise image

split_connected

Split pixset into connected components

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

Load example image

Remove empty dimensions from an array

Pad image with n pixels along specified axis

A pixset for NA values

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

patch_summary_cimg

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

Young-Van Vliet recursive Gaussian filter.

Load image from file or URL

px.remove_outer

Remove all connected regions that touch image boundaries

Load all images in a directory

Generate (Gaussian) white-noise image

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

Plot a line, Hesse normal form parameterisation

Display an image using base graphics

Return locations in pixel set

Compute watershed transform.

Plot objects on image using base graphics

Fill-in NA values in an image

Permute image axes

Build simple interactive interfaces using imager

resize_doubleXY

Resize image uniformly

Remove alpha channel and store as attribute

Threshold grayscale image

A cross-shaped stencil