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OpenImageR

An Image Processing Toolkit

Incorporates functions for image preprocessing, filtering and image recognition. The package takes advantage of 'RcppArmadillo' to speed up computationally intensive functions. The histogram of oriented gradients descriptor is a modification of the 'findHOGFeatures' function of the 'SimpleCV' computer vision platform, the average_hash(), dhash() and phash() functions are based on the 'ImageHash' python library. The Gabor Feature Extraction functions are based on 'Matlab' code of the paper, "CloudID: Trustworthy cloud-based and cross-enterprise biometric identification" by M. Haghighat, S. Zonouz, M. Abdel-Mottaleb, Expert Systems with Applications, vol. 42, no. 21, pp. 7905-7916, 2015, <doi:10.1016/j.eswa.2015.06.025>. The 'SLIC' and 'SLICO' superpixel algorithms were explained in detail in (i) "SLIC Superpixels Compared to State-of-the-art Superpixel Methods", Radhakrishna Achanta, Appu Shaji, Kevin Smith, Aurelien Lucchi, Pascal Fua, and Sabine Suesstrunk, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 34, num. 11, p. 2274-2282, May 2012, <doi:10.1109/TPAMI.2012.120> and (ii) "SLIC Superpixels", Radhakrishna Achanta, Appu Shaji, Kevin Smith, Aurelien Lucchi, Pascal Fua, and Sabine Suesstrunk, EPFL Technical Report no. 149300, June 2010.

Functions (49)

Augmentation

image augmentations of a matrix, data frame, array or a list of 3-dimensional arrays

GaborFeatureExtract

Gabor Feature Extraction

HOG

calculate the HOG (Histogram of oriented gradients) for an image

HOG_apply

calculate the HOG (Histogram of oriented gradients) for a matrix, array or a folder of images

List_2_Array

convert a list of matrices to an array of matrices

MinMaxObject

minimum and maximum values of vector, matrix, data frame or array

NormalizeObject

normalize a vector, matrix or array (in the range between 0 and 1)

RGB_to_HSV

Conversion of RGB to HSV colour type

RGB_to_Lab

Conversion of RGB to Lab colour type

ZCAwhiten

zca whiten of an image

average_hash

calculation of the 'average hash' of an image

convolution

convolution

cropImage

crop an image

crop_image_secondary

crop an image in R [ for RGB or grey images ]

delationErosion

Delation or Erosion of an image

dhash

calculation of the 'dhash' of an image

down_sample_image

downsampling an image ( by a factor ) using gaussian blur

edge_detection

edge detection (Frei_chen, LoG, Prewitt, Roberts_cross, Scharr, Sobel)

flipImage

flip image horizontally or vertically

func_chech_range

function to check the range of values of an image or normalize an image

func_transform

secondary function for HOG_apply

gamma_correction

Gamma correction

gaussian_kernel

gaussian-kernel

hash_apply

calculate the binary or the hexadecimal hash for a matrix, array or a folder of images for the average_hash, phash or dhash functions

imageShow

display an image

image_thresholding

image thresholding

invariant_hash

invariant hashing (caclulation of the hamming or the levenshtein distance when the image is flipped, rotated or cropped)

laplacian_kernels

laplacian kernels

load_binary

loads either 2- or 3-dimensional data from a binary file

norm_matrix_range

Normalize a matrix to specific range of values

padding

Padding of matrices or n-dimensional arrays with a user specified value

phash

calculation of the 'phash' of an image

readImage

this function reads various types of images

resizeImage

resize an image using the 'nearest neighbors' or the 'bilinear' method

rgb_2gray

convert an RGB image to Gray

rotateFixed

Rotate an image by 90, 180, 270 degrees

rotateImage

Rotate an image using the 'nearest' or 'bilinear' method

runUI

launcher for the shiny application

sec_gaus_bl

secondary function for downsampling

sec_resiz_array

secondary function for 'resizeImage' [ array ]

superpixel_bbox

Bounding box for the superpixel labels

superpixel_bbox_subset

Bounding box for a subset of superpixel labels

superpixels

SLIC and SLICO superpixel implementations

switch_filter

secondary function for edge_detection function

switch_hashing

if-else function for hashing

switch_invariant

secondary function for invariant_hash

translation

image translation

uniform_filter

uniform filter (convolution with uniform kernel)

writeImage

This function writes 2- or 3-dimensional image data to a file

OpenImageR

An Image Processing Toolkit

v1.1.8

GPL-3

Authors

Lampros Mouselimis [aut, cre] (<https://orcid.org/0000-0002-8024-1546>), Sight Machine [cph] (findHOGFeatures function of the SimpleCV computer vision platform), Johannes Buchner [cph] (average_hash, dhash and phash functions of the ImageHash python library), Mohammad Haghighat [cph] (Gabor Feature Extraction), Radhakrishna Achanta [cph] (Author of the C++ code of the SLIC and SLICO algorithms (for commercial use please contact the author))

Initial release

2021-05-04

OpenImageR

Functions (49)

OpenImageR

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