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help graythresh

GRAYTHRESH Compute global image threshold using Otsu's method.
    LEVEL = GRAYTHRESH(I) computes a global threshold (LEVEL) that can be
    used to convert an intensity image to a binary image with IM2BW. LEVEL
    is a normalized intensity value that lies in the range [0, 1].
    GRAYTHRESH uses Otsu's method, which chooses the threshold to minimize
    the intraclass variance of the thresholded black and white pixels.

    Class Support
    -------------
    The input image I can be of class uint8, uint16, or double and it
    must be nonsparse.  LEVEL is a double scalar.

    Example
    -------
        I = imread('coins.png');
        level = graythresh(I);
        BW = im2bw(I,level);
        imview(BW)

    See also im2bw.

    Reference page in Help browser
       doc graythresh
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