diff --git a/doc/examples/plot_local_equalize.py b/doc/examples/plot_local_equalize.py index e79ddbed..840f2a1f 100644 --- a/doc/examples/plot_local_equalize.py +++ b/doc/examples/plot_local_equalize.py @@ -5,13 +5,14 @@ Local Histogram Equalization This examples enhances an image with low contrast, using a method called *local histogram equalization*, which "spreads out the most frequent intensity -values" in an image . The equalized image has a roughly linear cumulative -distribution function for each pixel neigborhood. +values" in an image . The equalized image [1]_ has a roughly linear cumulative +distribution function for each pixel neighborhood. The local version [2]_ of the histogram +equalization emphasized every local graylevel variations. to be adjusted... .. [1] http://en.wikipedia.org/wiki/Histogram_equalization -.. [2] http://homepages.inf.ed.ac.uk/rbf/HIPR2/stretch.htm +.. [2] http://en.wikipedia.org/wiki/Adaptive_histogram_equalization """ @@ -58,7 +59,7 @@ img = data.moon() # Contrast stretching p2 = np.percentile(img, 2) p98 = np.percentile(img, 98) -img_rescale = exposure.rescale_intensity(img, in_range=(p2, p98)) +img_rescale = exposure.equalize(img) # Equalization selem = disk(30) @@ -73,10 +74,10 @@ ax_img.set_title('Low contrast image') ax_hist.set_ylabel('Number of pixels') ax_img, ax_hist, ax_cdf = plot_img_and_hist(img_rescale, axes[:, 1]) -ax_img.set_title('Contrast stretching') +ax_img.set_title('Global equalise') ax_img, ax_hist, ax_cdf = plot_img_and_hist(img_eq, axes[:, 2]) -ax_img.set_title('Local Histogram equalization') +ax_img.set_title('Local equalize') ax_cdf.set_ylabel('Fraction of total intensity')