diff --git a/doc/examples/applications/plot_rank_filters.py b/doc/examples/applications/plot_rank_filters.py
index 75806486..ee89a4e7 100644
--- a/doc/examples/applications/plot_rank_filters.py
+++ b/doc/examples/applications/plot_rank_filters.py
@@ -346,11 +346,11 @@ plt.imshow(p8,cmap=plt.cm.gray)
 plt.xlabel('original')
 plt.colorbar()
 plt.subplot(2,2,2)
-plt.imshow(loc_otsu,cmap=plt.cm.gray)
+plt.imshow(t_loc_otsu,cmap=plt.cm.gray)
 plt.xlabel('local Otsu ($radius=%d$)'%radius)
 plt.colorbar()
 plt.subplot(2,2,3)
-plt.imshow(p8>=loc_otsu,cmap=plt.cm.gray)
+plt.imshow(p8>=t_loc_otsu,cmap=plt.cm.gray)
 plt.xlabel('original>=local Otsu'%t_glob_otsu)
 plt.subplot(2,2,4)
 plt.imshow(glob_otsu,cmap=plt.cm.gray)