otsu {pliman} | R Documentation |
Calculate Otsu's threshold
Description
Given a numeric vector with the pixel's intensities, returns the threshold value based on Otsu's method, which minimizes the combined intra-class variance
Usage
otsu(values)
Arguments
values |
A numeric vector with the pixel values. |
Value
A double (threshold value).
References
Otsu, N. 1979. Threshold selection method from gray-level histograms. IEEE Trans Syst Man Cybern SMC-9(1): 62–66. doi: doi:10.1109/tsmc.1979.4310076
Examples
img <- image_pliman("soybean_touch.jpg")
thresh <- otsu(img@.Data[,,3])
plot(img[,,3] < thresh)
[Package pliman version 2.1.0 Index]