[osmFISH 2/5] Implement Laplacian Filter

[dganguli]

This filter enhances spots, and is used by the osmFISH pipeline. Under the hood, it's simply a call to scipy.ndimage.gaussian_laplace

Note that there is no test for this filter. From offline conversations, it's not clear what our testing strategy for filters are. Especially for filters that are pulled in from existing libraries, like this one. Really, what we want to test here is that the Starfish specific wrapping code works as expected.

For now, I'll rely on [osmFISH 5/5] notebook to function as the test of this filter.

[dganguli]

FYI @simone-codeluppi

[ambrosejcarr]

Ready for review.

[codecov-io]

Codecov Report

Merging #687 into master will decrease coverage by <.01%.
The diff coverage is 87.87%.

@@            Coverage Diff             @@
##           master     #687      +/-   ##
==========================================
- Coverage   88.04%   88.04%   -0.01%     
==========================================
  Files         121      122       +1     
  Lines        4133     4166      +33     
==========================================
+ Hits         3639     3668      +29     
- Misses        494      498       +4

Impacted Files	Coverage Δ
starfish/image/_filter/__init__.py	95.23% <100%> (+0.11%)	⬆️
starfish/image/_filter/laplace.py	87.5% <87.5%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d526680...225f3a0. Read the comment docs.