add image.CannyEdges

image.CannyEdges/.Rbuildignore

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+^.*\.Rproj$
+^\.Rproj\.user$

image.CannyEdges/.gitignore

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+.Rproj.user
+.Rhistory
+.RData
+.Ruserdata
+src/*.o
+src/*.so
+src/*.dll

image.CannyEdges/DESCRIPTION

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+Package: image.CannyEdges
+Type: Package
+Title: Implementation of the Canny Edge Detector for Images
+Version: 1.0
+Author: c(person("Jan", "Wijffels", role = c("aut", "cre", "cph"), email = "[email protected]"), person("BNOSAC", role = "cph"), person("Rafael Grompone von Gioi", role = "cph", email = "[email protected]"), person("Vincent Maioli", role = "cph", email = "[email protected]"))
+Maintainer: Jan Wijffels <[email protected]>
+Description: An implementation of the Canny Edge Detector. The package provides in interface to the algorithm available at <https://github.com/Neseb/canny>.
+License: GPL-3
+Encoding: UTF-8
+Imports:
+    Rcpp (>= 0.12.9)
+LinkingTo: Rcpp
+Suggests:
+    pixmap
+RoxygenNote: 6.0.1
+SystemRequirements: libpng, fftw3

image.CannyEdges/NAMESPACE

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+# Generated by roxygen2: do not edit by hand
+
+S3method(plot,image_canny)
+S3method(print,image_canny)
+export(image_canny_edge_detector)
+importFrom(Rcpp,evalCpp)
+importFrom(graphics,plot)
+importFrom(graphics,rasterImage)
+useDynLib(image.CannyEdges)

image.CannyEdges/R/RcppExports.R

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+# Generated by using Rcpp::compileAttributes() -> do not edit by hand
+# Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393
+
+canny_edge_detector <- function(image, X, Y, s = 2, low_thr = 3, high_thr = 10, accGrad = FALSE) {
+    .Call('image_CannyEdges_canny_edge_detector', PACKAGE = 'image.CannyEdges', image, X, Y, s, low_thr, high_thr, accGrad)
+}
+

image.CannyEdges/R/canny_edges_detector.R

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+#' @title Canny Edge Detector for Images
+#' @description Canny Edge Detector for Images. See \url{https://en.wikipedia.org/wiki/Canny_edge_detector}.
+#' Adapted from \url{https://github.com/Neseb/canny}.
+#' @param x a matrix of image pixel values in the 0-255 range.
+#' @param s sigma, the Gaussian filter variance. Defaults to 2.
+#' @param low_thr lower threshold value of the algorithm. Defaults to 3.
+#' @param high_thr upper threshold value of the algorithm. Defaults to 10
+#' @param accGrad logical indicating to trigger higher-order gradient
+#' @return a list with element edges which is a matrix with values 0 or 255 indicating
+#' in the same dimension of \code{x}. Next to that
+#' the list also contains the input parameters s, low_thr, high_thr and accGrad,
+#' the number of rows (nx) and columns of the image (ny) and the number of pixels which
+#' have value 255 (pixels_nonzero).
+#' @export
+#' @examples
+#' library(pixmap)
+#' imagelocation <- system.file("extdata", "chairs.pgm", package="image.CannyEdges")
+#' image <- read.pnm(file = imagelocation, cellres = 1)
+#' x <- image@grey * 255
+#'
+#' edges <- image_canny_edge_detector(x)
+#' edges
+#' plot(edges)
+#'
+#' \dontrun{
+#' ##
+#' ## image_canny_edge_detector expects a matrix as input
+#' ##  if you have a jpg/png/... convert it to pgm first or take the r/g/b channel
+#' f <- tempfile(fileext = ".pgm")
+#' library(magick)
+#' x <- image_read(system.file("extdata", "atomium.jpg", package="image.CannyEdges"))
+#' x <- image_convert(x, format = "pgm", depth = 8)
+#' image_write(x, path = f, format = "pgm")
+#'
+#' image <- read.pnm(f, cellres = 1)
+#' edges <- image_canny_edge_detector(image@grey * 255)
+#' plot(edges)
+#' }
+image_canny_edge_detector <- function(x, s = 2, low_thr = 3, high_thr = 10, accGrad = TRUE) {
+  x <- canny_edge_detector(as.integer(x), nrow(x), ncol(x), s, low_thr, high_thr, accGrad)
+  class(x) <- "image_canny"
+  x
+}
+
+
+#' @export
+print.image_canny <- function(x, ...){
+  cat("Canny edge detector", sep = "\n")
+  cat(sprintf("  %s x %s matrix", x$nx, x$ny), sep = "\n")
+  cat(sprintf("  number of pixels on edge %s", x$pixels_nonzero), sep = "\n")
+  cat(sprintf("  sigma %s", x$s), sep = "\n")
+  cat(sprintf("  low_thr %s", x$low_thr), sep = "\n")
+  cat(sprintf("  high_thr %s", x$high_thr), sep = "\n")
+  cat(sprintf("  accGrad %s", x$accGrad), sep = "\n")
+}
+
+
+
+#' @title Plot the result of the Canny Edge Detector
+#' @description Plot the result of \url{image_canny_edge_detector}
+#' @param x an object of class image_canny as returned by \code{\link{image_canny_edge_detector}}
+#' @param ... further arguments passed on to plot, except type, xlab and ylab which are set inside the function
+#' @method plot image_canny
+#' @return invisible()
+#' @export
+#' @examples
+#' library(pixmap)
+#' imagelocation <- system.file("extdata", "chairs.pgm", package="image.CannyEdges")
+#' image <- read.pnm(file = imagelocation, cellres = 1)
+#' edges <- image_canny_edge_detector(image@grey * 255)
+#' plot(edges)
+plot.image_canny<- function(x, ...){
+  ok <- grDevices::as.raster(x$edges, max = 255)
+  plot(c(1, x$nx), c(1, x$ny), type = "n", xlab = "", ylab = "", ...)
+  rasterImage(ok, 0, 0, x$nx, x$ny)
+  invisible()
+}

image.CannyEdges/R/pkg.R

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+#' @title Implementation of the Canny Edge Detector for Images
+#' @description Canny Edge Detector for Images. See \url{https://en.wikipedia.org/wiki/Canny_edge_detector}.
+#' Adapted from \url{https://github.com/Neseb/canny}.
+#' @name image.CannyEdges-package
+#' @aliases image.CannyEdges-package
+#' @docType package
+#' @importFrom Rcpp evalCpp
+#' @importFrom graphics plot rasterImage
+#' @useDynLib image.CannyEdges
+#' @seealso \link{image_canny_edge_detector}
+NULL

image.CannyEdges/README.md

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+# image.CannyEdges - Canny Edge Detector for Images
+
+The  **image.CannyEdges** R package detects edges in images. 
+
+- It contains 1 main function **image_canny_edge_detector**. If you give it an image matrix with grey scale values in the 0-255 range, it will find edges in the image.
+
+## Examples
+
+Read in an image with values in the 0-255 range (pgm image: http://netpbm.sourceforge.net/doc/pgm.html)
+
+```r
+library(image.CannyEdges)
+library(pixmap)
+imagelocation <- system.file("extdata", "chairs.pgm", package="image.CannyEdges")
+image <- read.pnm(file = imagelocation, cellres = 1)
+x <- image@grey * 255
+
+edges <- image_canny_edge_detector(x)
+edges
+plot(edges)
+```
+
+## Installation
+
+See instructions at https://github.com/bnosac/image
+
+## Support in image recognition
+
+Need support in image recognition?
+Contact BNOSAC: http://www.bnosac.be
+

image.CannyEdges/image.CannyEdges.Rproj

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+Version: 1.0
+
+RestoreWorkspace: Default
+SaveWorkspace: Default
+AlwaysSaveHistory: Default
+
+EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 2
+Encoding: UTF-8
+
+RnwWeave: Sweave
+LaTeX: pdfLaTeX
+
+AutoAppendNewline: Yes
+StripTrailingWhitespace: Yes
+
+BuildType: Package
+PackageUseDevtools: Yes
+PackageInstallArgs: --no-multiarch --with-keep.source
+PackageRoxygenize: rd,collate,namespace