![]() In contrast, Otsu's method avoids having to choose a value and determines it automatically.Ĭonsider an image with only two distinct image values ( bimodal image), where the histogram would only consist of two peaks. ![]() In global thresholding, we used an arbitrary chosen value as a threshold. The code below compares global thresholding and adaptive thresholding for an image with varying illumination: The blockSize determines the size of the neighbourhood area and C is a constant that is subtracted from the mean or weighted sum of the neighbourhood pixels.
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