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imager (version 0.14)

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

0.14

License

LGPL

Maintainer

Simon Barthelme

Last Published

September 18th, 2015

Functions in imager (0.14)

Return pixel value at coordinates

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

Label connected components.

Capture the current R plot device as a cimg image

extract_patches

Return image patches

Convert a cimg object to a raster object

Mirror image content along specified axis

Estimate displacement field between two images.

Interpolate image values

Convert cimg to spatstat im object

Photograph of sailing boats from Kodak set

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

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

as.cimg.data.frame

Create an image from a data.frame

Split a colour image into a list of separate channels

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

Create a cimg object

distance_transform

Compute Euclidean distance function to a specified value.

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

Autocrop image region

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

Compute the Discrete Fourier Transform of an image

cimg.dimensions

Image dimensions

Combining images

Correlation of image by filter

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).

Add colour channels to an grayscale image

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

Convert an RGB image to grayscale

Blur image isotropically.

Convert to cimg object

Center stencil at a location

Display image list using CImg library

Split a video into separate frames

Pad image with n pixels along specified axis

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

as.data.frame.cimg

Convert a pixel image to a data.frame

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

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

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Rotate image by an arbitrary angle.

Load image from file or URL

Return pixel values in a neighbourhood defined by a stencil

Permute image axes

Select a region of homogeneous colour

Generate (Gaussian) white-noise image

Threshold grayscale image

Compute watershed transform.

A cross-shaped stencil

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

Compute Haar multiscale wavelet transform.

Blur image with a box filter.

Create an image of custom size by filling in repeated values

Display an image using base graphics

Apply recursive Deriche filter.

resize_doubleXY

Resize image uniformly

Remove empty dimensions from an array

Display image using CImg library

Blur image with the median filter.

Select part of an image

Array subset operator for cimg objects

Turn an numeric array into a cimg object

Combine a list of images into a single image

Various shortcuts for extracting colour channels, frames, etc

Erode/dilate image by a structuring element.

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

Linear index in internal vector from pixel coordinates

Blur image with a box filter (square window)

Convolve image by filter.

Compute image hessian.

Return image hessian.

Return coordinates of subset of pixels

Compute image gradient

Draw image on another image

Shift image content.

Returns the pixel grid for an image

as.cimg.function

Create an image by sampling a function

Compute image gradient.

Colour space conversions in imager

Renormalise image

Van Vliet recursive Gaussian filter.