Is Center-Surround mechanism implemented in opencv?

Question

I am new to the concept of Biologically Salient Regions Detector, and I read some papers and they always use the mechanism of Center-Surrond to computer features intensity, color and orientation. I googled that mechanism but i did not find implementation of it by Opencv with Java API or in any other libraries.

Actually i want to create the saliency map, and as far as i researched, some features like intensity, color, orientation are to be computed by the center-surround mechanism/filter.

I read lot o publications and the best of them, just provided a pseudo code but still it lacks clarity. i mean if you have a question regarding detailed issues to have an idea how that filter works, that pseudo code would not help much.

Is the center-surround filter mechanism is implemented in Opencv or in any other library?

Please provide explanation using and pseudocode.

Speedometer

are you not able to implement the center-surround mechanism/filter or do you not understand what it is (in detail)? – Kendo

@Kendo sorry for the late reply. it is about the how that mechanism works.. i got a puplication that explains in peseudo code how to compute the on-off intensity..but mentioned nothing about the off-on intensity..so i just need to know how it works because it will be applied also on the color and orientation – Speedometer

Answer 1

These links may point you in the right direction I hope.

http://www.cs.rit.edu/~rlc/Dissertation/chapter6color.pdf

http://ilab.usc.edu/publications/doc/Itti_Koch00vr.pdf

https://books.google.co.uk/books?id=MkSY6pFhmYsC&pg=PA540&lpg=PA540&dq=center-surround+filter+mechanism&source=bl&ots=vVbCv_Ilou&sig=aU18i3J4agHVplK8u9psZ_TySks&hl=en&sa=X&ei=tnQ2VeWGHoTmao-xgdgG&ved=0CEsQ6AEwBg#v=onepage&q=center-surround%20filter%20mechanism&f=false

And this link it to an early version of Itti and Koch's saliency model in Pythons OpenCV bindings.

Hope it helps.

Eldon

Answer 2

For better understanding towards ON - OFF channels in Vision, I would suggest you to have look into this excellent research aiming To determine how visual perception is processed by the brain and how visually guided eye movements are generated which is carried at Schiller MIT The Function of the On and Off Channels in Vision.

Detailed explanations along with examples and source code is available here for

• Center Surround cell responses.
• Dot Pattern selective cell.
• Spot-Group detection
• Spot detection

Hope it helps

Paella