freeimage: Correctly handle saving uint16 images (closes gh-1101)
Merge pull request #1102 from stefanv/bug/freeimage_uint16

freeimage: Correctly handle saving uint16 images (closes gh-1101)
Fix bugs in HOG
Replaced convolve1d by ad-hoc gradient computation
Code valid for all image dtypes
Minor fix
Merge pull request #1105 from pmneila/master

Minor fix for bugs in HOG implementation
remove self loops in rag
fixed set union
working code
docstrings
unit tests
Description of example
fix example
rebase and docstring changes
added nx check in test
edge heap
complete heap implementation
blank line
lists in the heap to avoid copying of dict