Animations of GGBMS iterations (animated GIFs, view with internet browser
or with xanim/gifview in Linux) for the cameraman 50x50 greyscale image.
File names are coded as follows:
    dataset_method_parameter.gif
where method = e/n/i/E (explicit-e, explicit-n, implicit-e, exponential-e)
and parameter is the corresponding e or n value.

The sigma values used are as follows:
- cameraman_e_1: sigma = 6
- cameraman_e_0.5: sigma = 6.2
- cameraman_e_1.25: sigma = 6.2
- cameraman_n_5: sigma = 5
- cameraman_i_100: sigma = 3.5
- cameraman_E_100: sigma = 3.4