1. Property constant along rays non-negativity coherence wavelength
cross term
traditional light field
always constant
always positive
only incoherent
zero no
observable light field
nearly constant
any coherence state
for any wavelength
has cross term
augmented light field
only in the paraxial region
positive and negative
WDF
has cross
term
Rihaczek
no; linear drift
complex
reduced cross terms

2. benefits & limitations
ability to propagate
representing wave optics
simplicity of computation
adaptability to current pipe line
near field
far field
traditional light field
x-shear no
very simple
high
yes
observable light field
not x-shear
modest
low
augmented light field
WDF
Rihaczek
better than WDF, not as simple as LF