threshold-yen

threshold_yen

skimage.filters.threshold_yen(image, nbins=256) [source]

Return threshold value based on Yen’s method.

Parameters:	image : array Input image. nbins : int, optional Number of bins used to calculate histogram. This value is ignored for integer arrays.
Returns:	threshold : float Upper threshold value. All pixels intensities that less or equal of this value assumed as foreground.

References

[R207]

Yen J.C., Chang F.J., and Chang S. (1995) “A New Criterion for Automatic Multilevel Thresholding” IEEE Trans. on Image Processing, 4(3): 370-378

[R208]

Sezgin M. and Sankur B. (2004) “Survey over Image Thresholding Techniques and Quantitative Performance Evaluation” Journal of Electronic Imaging, 13(1): 146-165, http://www.busim.ee.boun.edu.tr/~sankur/SankurFolder/Threshold_survey.pdf

[R209]

ImageJ AutoThresholder code, http://fiji.sc/wiki/index.php/Auto_Threshold

Examples

>>> from skimage.data import camera
>>> image = camera()
>>> thresh = threshold_yen(image)
>>> binary = image <= thresh