Bus Error when running some Felzenszwalb segmentation

[colbrydi]

Sometimes the Felzenszwalb function crashes with a bush error. My guess is that one of the input parameters is causing a problem. It could be in the selected colorspace or the Felzenszwalb function itself. Here is an example of a set of parameters that fails.

<class 'see.Workflow.workflow'> parameters:
colorspace = RGB CIE
multichannel = True
channel = 1
algorithm = Felzenszwalb
alpha1 = 0.98828125
alpha2 = 0.8984375
beta1 = 0.94140625
beta2 = 0.7578125
gamma1 = 0.41796875
gamma2 = 0.1875
n_segments = 7
max_iter = 1

We need to track down the source of this failure and see if we can come up with a solution to either 1) limit the parameter space to only use values that result in errors 2) find and fix the bug in the segmentation code (report as a pull request) 3) use input tests to pick out input that will cause the problem and return an erorr or a default value or 4) try to catch this inside the code?

The first step is to build a test that can reproduce the problem and then see what can be changed in the test to fix the bug.