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imager (version 0.42.13)

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

0.42.13

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 7th, 2022

Functions in imager (0.42.13)

as.data.frame.pixset

Methods to convert pixsets to various objects

as.data.frame.cimg

Convert a pixel image to a data.frame

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Estimate displacement field between two images.

extract_patches

Extract image patches and return a list

Highlight pixel set on image

Flatten alpha channel

Compute Haar multiscale wavelet transform.

Modify parts of an image

Combine a list of images into a single image

Compute the Discrete Fourier Transform of an image

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

as.igraph.pixset

Form an adjacency graph from a pixset

Compute the bounding box of a pixset

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

as.data.frame.imlist

Convert image list to data.frame

Replace part of an image with another

Convert cimg to spatstat im object

Capture the current R plot device as a cimg image

Convert various objects to image lists

Center stencil at a location

Add circles to plot

Array subset operator for cimg objects

Coordinates as images

Add colour channels to a grayscale image or pixel set

Convert to cimg object

Compute image Laplacian

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

Linear index in internal vector from pixel coordinates

Canny edge detector

as.cimg.data.frame

Create an image from a data.frame

Turn an numeric array into a cimg object

Photograph of sailing boats from Kodak set

Shift image content.

Return or set pixel value at coordinates

Concatenation for image lists

Various useful pixsets

Autocrop image region

Split a colour image into a list of separate channels

Fill-in NA values in an image

Build simple interactive interfaces using imager

Various shortcuts for extracting colour channels, frames, etc

as.cimg.function

Create an image by sampling a function

Load a video using ffmpeg

cimg.use.openmp

Control CImg's parallelisation

Display object using CImg library

Find the boundary of a shape in a pixel set

Erode/dilate image by a structuring element.

Coordinates from pixel index

Correlation/convolution of image by filter

Draw text on an image

Check that value is in a range

Convert an RGB image to grayscale

Convert a raster object to a cimg object

Display image using CImg library

Return coordinates of subset of pixels

Split a video into separate frames

Load example image

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

Pixel sets (pixsets)

Return the pixel grid for an image

Compute image gradient

Create an image of custom size by filling in repeated values

Generate (Gaussian) white-noise image

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

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

Plot objects on image using base graphics

Interpolate image values

Checks that an object is a cimg object

Load all images in a directory

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

Return contours of image/pixset

Hough transform for lines

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

Circle detection using Hough transform

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

distance_transform

Compute Euclidean distance function to a specified value.

Display image list using CImg library

Compute image gradient.

Return pixel values in a neighbourhood defined by a stencil

Grayscale dimensions of image

Grow/shrink a pixel set

Draw image on another image

Convert a cimg object to a raster object for plotting

Methods to convert various objects to pixsets

Blur image with a box filter (square window)

Permute image axes

Replicate images

Blur image isotropically.

Rotate an image along the XY plane.

Label connected components.

Evaluation in an image context

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

Load image from file or URL

Crop the outer margins of an image

Make/save a video using ffmpeg

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

resize_doubleXY

Resize image uniformly

Remove alpha channel and store as attribute

Select a region of homogeneous colour

Type-stable map for use with the purrr package

Plot an image list

Remove empty dimensions from an array

split_connected

Split pixset into connected components

Threshold grayscale image

A cross-shaped stencil

Young-Van Vliet recursive Gaussian filter.

Renormalise image

Apply recursive Deriche filter.

Draw rectangle on image

Draw circle on image

Colour space conversions in imager

Combining images

Return image hessian.

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

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

Select image regions interactively

Select part of an image

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

Check that an object is a pixset object

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.

Return information on image file

Compute image hessian.

Return image patch summary

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

Plot a line, Hesse normal form parameterisation

Mirror image content along specified axis

Display an image using base graphics

Compute watershed transform.

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

A pixset for NA values

Return locations in pixel set

px.remove_outer

Remove all connected regions that touch image boundaries

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

Create a cimg object

cimg.dimensions

Image dimensions

Form a graph from an image