calculateOtsu: Does Otsu thresholding
In CRImage: CRImage a package to classify cells and calculate tumour cellularity

Description Usage Arguments Details Value Author(s) References See Also Examples

The function applies Otsu thresholding on the image.

1	calculateOtsu(allGreyValues)

allGreyValues

Vector of grey values.

The function calculates a value which separates the grey value histogram the best in foreground and background.

the threshold

Henrik Failmezger, failmezger@cip.ifi.lmu.de

Nobuyuki Otsu: A threshold selection method from grey level histograms. In: IEEE Transactions on Systems, Man, and Cybernetics. New York 9.1979, S.62-66. ISSN 1083-4419

calculateThreshold localOtsuThreshold

f1= system.file("extdata", "exImg2.jpg", package="CRImage")
print(f1)
img=readImage(f1)
print(img)
#convert to grayscale
imgG=EBImage::channel(img,'grey')
#threshold value
t=calculateOtsu(as.vector(imgG))