Retina image processing model: local and temporal filter (spatio-temporal filter)

Hello,

I'm currently working on a retina filter implementation that operates on the principle of human vision. Therefore they are several filters which recognize contours and movements in image sequences.

One of them is called OPL filter and has the following transfer function:

local z-transformed and temporal frequency transformed (FT)

or purely frequency transformed (FT)

It is applied to the individual frames of an image sequence.

Unfortunately I can not find a useful filter mask or a filter kernel which represent this transfer function. I don't know how I may apply this transfer function neither on a image nor image sequence.

In addition, for me it is not clear which role does the time component inside the transfer function/ filter function plays?

Does the frequency ft relate on the frame rate per second or to the change of a pixel intensity in the course of time.

j2 * pi * Ft * th

What is the local component for? The difference between the pixel intensity of the pixel to its neighbours?

-z-1 + 2 - z

the paper for further reading: http://www.baillement.com/dossier/hypovigilance-caplier.pdf

Answer 1

[Aasim]

I am facing the same problem. If you discovered please share. as your question seems old. Thanks and awaits.