scikit-image/scikit-image — pull request #1109 by blink1073 (2014-08-25 11:44:22+00:00)
Title: Add mask option to exposure.equalize_hist with test.

Adds an optional `mask` argument to `exposure.equalize_hist`. If given, the equalization is calculated based on the unmasked region, and applied to the whole image. A test is included. Addresses #1107.