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imager (version 0.13)

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.

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Version

Install

install.packages('imager')

Monthly Downloads

7,797

Version

0.13

License

LGPL

Maintainer

Simon Barthelme

Last Published

August 26th, 2015

Functions in imager (0.13)

Display image list using CImg library

Split a video into separate frames

Convert cimg to spatstat im object

Renormalise image

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

blur_anisotropic

Blur image anisotropically, in an edge-preserving way.

extract_patches

Return image patches

Convert an RGB image to grayscale

Load image from file

Display image using CImg library

as.cimg.data.frame

Create an image from a data.frame

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

Correlation of image by filter

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

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

Create an image of custom size by filling in repeated values

Shift image content.

Compute image hessian.

cimg.dimensions

Image dimensions

Combining images

Label connected components.

Mirror image content along specified axis

Blur image with the median filter.

as.cimg.function

Create an image by sampling a function

Select a region of homogeneous colour

Erode/dilate image by a structuring element.

Remove empty dimensions from an array

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).

Select part of an image

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

Generate (Gaussian) white-noise image

Combine a list of images into a single image

Blur image with a box filter.

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

Van Vliet recursive Gaussian filter.

Convert to cimg object

Autocrop image region

Pad image with n pixels along specified axis

Colour space conversions in imager

Return pixel value at coordinates

Blur image with a box filter (square window)

Estimate displacement field between two images.

Return coordinates of subset of pixels

Return pixel values in a neighbourhood defined by a stencil

Compute image gradient.

Compute the Discrete Fourier Transform of an image

Compute Haar multiscale wavelet transform.

Interpolate image values

Array subset operator for cimg objects

Threshold grayscale image

Convert a cimg object to a raster object

Display an image using base graphics

Convolve image by filter.

A cross-shaped stencil

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

Return image hessian.

Capture the current R plot device as a cimg image

Create a cimg object

Linear index in internal vector from pixel coordinates

Permute image axes

Center stencil at a location

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

diffusion_tensors

Compute field of diffusion tensors for edge-preserving smoothing.

Compute image gradient

Split a colour image into a list of separate channels

Add colour channels to an grayscale image

Various shortcuts for extracting colour channels, frames, etc

Apply recursive Deriche filter.

Photograph of sailing boats from Kodak set

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

Rotate image by an arbitrary angle.

Turn an numeric array into a cimg object

as.data.frame.cimg

Convert a pixel image to a data.frame

distance_transform

Compute Euclidean distance function to a specified value.

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

Draw image on another image

Blur image isotropically.

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

Returns the pixel grid for an image

Compute watershed transform.

resize_doubleXY

Resize image uniformly