Fixes a bug in _update_doc in skimage/io/__init__.py that will attempt to compute max of empty list if no plugins are found.
Modified rank filters package so that the _core function in core.pyx outputs to a 3D image, permitting the generation of images with arbitrary size feature vector pixels. Implemented windowed_histogram that generates a windowed histogram of an image.
Fixed some test failures and added a test for windowed_histogram.
Fixed some issues with the new windowed_histogram function in filter.rank.
It used to be able to output uint8 histogram, whose max pixel counts of 255 could easily overflow. Addressed by limiting the output type to float.
Normalized histograms are now generated, otherwise behaviour is unpredictable at boundaries or when pixels are not permitted by a mask.
The new optional n_bins parameter allows the caller to specify the size of the histogram generated. Having it fixed to image.max()+1 could result in feature vectors being shorter than desired just due to a value not being used in an image.
An example has been added to the docs, that demonstrates the application of windows histograms in object matching; a single coin is extracted and found by chi squared histogram matching.
Fixed Python 3 error in plot_windowed_histogram caused by use of incorrect division operator. Also tweaked the similarity computation a little.
Exchanged array output parameter for pointer and Py_ssize_t in kernel functions for slight speedup.
Improved plot_windowed_histogram doctoring, removed unnecessary imports and removed an internal testing line.
Fixed comment in plot_windowed_histogram.
Docstring and comment improvements and fixes in plot_windowed_histogram.
Readability improvement to skimage/io/__init__.py
Small fix to windowed_histogram doctoring.
Fix to skimage.filter.rank.windowed_histogram docstring.
Better explanation of technique in plot_windowed_histogram example, along with (hopefully correct) citations.
Relevant additions to release_dev.txt and CONTRIBUTORS.txt.
PEP8 compliance and doc formatting fixes.
Fixed mistake in generic.py
Merge pull request #1127 from Brittix1023/windowed_histogram

Windowed histogram