ThresholdTriclass: Iterative Triclass Thresholding

In imagerExtra: Extra Image Processing Library Based on 'imager'

Description

compute threshold value by Iterative Triclass Threshold Technique

Usage

ThresholdTriclass(im, stopval = 0.01, repeatnum, intervalnumber = 1000,
  returnvalue = FALSE)

Arguments

im	a grayscale image of class cimg
stopval	value to determine whether stop iteration of triclass thresholding or not. Note that if repeat is set, stop is ignored.
repeatnum	number of repetition of triclass thresholding
intervalnumber	interval number of histogram
returnvalue	if returnvalue is TRUE, ThresholdTriclass returns threshold value. if FALSE, ThresholdTriclass returns pixset.

Value

a pixel set or a numeric

Author(s)

Shota Ochi

References

Cai HM, Yang Z, Cao XH, Xia WM, Xu XY (2014). A New Iterative Triclass Thresholding Technique in Image Segmentation. IEEE TRANSACTIONS ON IMAGE PROCESSING.

Examples

g <- grayscale(boats)
layout(matrix(1:4, 2, 2))
plot(boats, main = "Original")
plot(g, main = "Grayscale")
threshold(g) %>% plot(main = "A Variant of Otsu")
ThresholdTriclass(g) %>% plot(main = "Triclass")

imagerExtra documentation built on May 2, 2019, 1:44 p.m.