Object oriented interface

[sjkisner]

I pushed a branch oo_interface that includes a definition of a new callable class Recon that wraps svmbir.recon(). What it currently does is very simple. Instances of Recon have the attribute .params which is a dictionary of all the arguments to svmbir.recon(). An instance of Recon is callable, and can be used with the same syntax as svmbir.recon(). So,

img = svmbir.recon(sino,angles,**kwargs)

Can be achieved equivalently with,

rec_op = svmbir.Recon(**kwargs)
img = rec_op(sino,angles)    # can also add keyword arguments here

Additionally it defines the following methods:

__init__(self, **kwargs)      # defines/sets initial 'params' attribute
__call__(self, sino, angles, **kwargs)    # calls svmbir.recon()
set_defaults()             # resets params attribute to defaults
set_params(**kwargs)       # sets params entries by keyword
save_params(filename)      # save params dict to numpy/pickle file
load_params(filename)      # load params dict from numpy/pickle file
backproject(sino, angles, **kwargs)    # backprojector

I added a file demo/demo_oo.py that illustrates further.

We can use this thread to discuss this and further development of an OO interface for svmbir.