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imager (version 0.15)

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.

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Version

Install

install.packages('imager')

Monthly Downloads

12,098

Version

0.15

License

LGPL

Maintainer

Simon Barthelme

Last Published

January 7th, 2016

Functions in imager (0.15)

cimg.dimensions

Image dimensions

Replace part of an image with another

Photograph of sailing boats from Kodak set

Select a region of homogeneous colour

Remove empty dimensions from an array

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

Compute image gradient.

Return image hessian.

Autocrop image region

Split a video into separate frames

Shift image content.

Renormalise image

as.cimg.data.frame

Create an image from a data.frame

A cross-shaped stencil

Convert an RGB image to grayscale

Convert cimg to spatstat im object

Array subset operator for cimg objects

Convolve image by filter.

Compute image hessian.

Return pixel values in a neighbourhood defined by a stencil

Convert a cimg object to a raster object

Draw image on another image

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

Combining images

Rotate image by an arbitrary angle.

Various shortcuts for extracting colour channels, frames, etc

resize_doubleXY

Resize image uniformly

Permute image axes

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

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Compute Haar multiscale wavelet transform.

Compute the Discrete Fourier Transform of an image

Estimate displacement field between two images.

extract_patches

Return image patches

as.cimg.function

Create an image by sampling a function

Generate (Gaussian) white-noise image

Add colour channels to an grayscale image

Compute image gradient

Display image using CImg library

Blur image with the median filter.

Blur image with a box filter (square window)

Return pixel value at coordinates

Return coordinates of subset of pixels

Threshold grayscale image

Apply recursive Deriche filter.

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

Combine a list of images into a single image

Correlation of image by filter

Blur image isotropically.

Select part of an image

Blur image with a box filter.

Create an image of custom size by filling in repeated values

Colour space conversions in imager

Compute watershed transform.

Center stencil at a location

Load image from file or URL

Erode/dilate image by a structuring element.

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

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

Interpolate image values

Resize image to new dimensions. If pd[x,y,z,v]<0, it corresponds to a percentage of the original size (the default value is -100).

Pad image with n pixels along specified axis

Display an image using base graphics

Mirror image content along specified axis

Compute the periodic part of an image, using the periodic/smooth decomposition of Moisan (2009)

Display image list using CImg library

as.data.frame.cimg

Convert a pixel image to a data.frame

Capture the current R plot device as a cimg image

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

Return the pixel grid for an image

Label connected components.

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

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

Turn an numeric array into a cimg object

Split a colour image into a list of separate channels

Linear index in internal vector from pixel coordinates

Convert to cimg object

distance_transform

Compute Euclidean distance function to a specified value.

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

Young-Van Vliet recursive Gaussian filter.

Create a cimg object

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