Normalization by dirac delta

[blasscoc]

Another possible normalization is to compute:

S[J] \delta(x) and use it to normalize, element by element, SJ.

[blasscoc]

Steps:

1. Create a "1" at the center of the image.
2. Apply scattering transform.
3. Save result and divide, element by element to the result of the scattering transform.

[blasscoc]

Create pixel "1" at the center of the image, zero otherwise.