pliman (version 2.1.0)

otsu: 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)

Value

A double (threshold value).

Arguments

values

A numeric vector with the pixel values.

References

Otsu, N. 1979. Threshold selection method from gray-level histograms. IEEE Trans Syst Man Cybern SMC-9(1): 62–66. doi: tools:::Rd_expr_doi("10.1109/tsmc.1979.4310076")

Examples

img <- image_pliman("soybean_touch.jpg")
thresh <- otsu(img@.Data[,,3])
plot(img[,,3] < thresh)