Summary functions

[IFenton]

Pixelflow currently calculates individual values across a number of objects in an image. These can be summarised as a count, or the sum of a value for the whole image. It would be good to extend these summaries to include a broader range of functions (e.g. mean, variance) as well as custom functions, to represent the characteristics of the whole image.

Next steps for this:

• [ ] Create summary function to apply to the current pixelflow output (@IFenton)
• [ ] #42

[IFenton]

I'm working on creating this function in IFenton-41-SummaryFunction