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Circular thresholding

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Original image: neutrophil white blood cells (leukocytes)
Hue component
Hue component shown as intensity image
Hue component thresholded with linear version of Otsu's algorithm
Hue component thresholded with circular version of Otsu's algorithm

Circular thresholding is an algorithm for automatic image threshold selection in image processing. Most threshold selection algorithms assume that the values (e.g. intensities) lie on a linear scale. However, some quantities such as hue and orientation are a circular quantity, and therefore require circular thresholding algorithms. The example shows that the standard linear version of Otsu's Method when applied to the hue channel of an image of blood cells fail so correctly segment the large white blood cells (leukocytes), in contrast to the circular version of Otsu's Method.

References and further reading

  • Y.K. Lai, P.L. Rosin, Efficient Circular Thresholding, IEEE Trans. on Image Processing 23(3), 992-1001 (2014). doi:10.1109/TIP.2013.2297014
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