Methods for object detection during sudden illumination change..

I am trying to detect objects from video sequences having sudden illumniation changes.I have studied few papers which try to solve this issue, but the math behind it was quite complicated. Could anyone suggest some good resources for solving this problem??

Answer 1

[Image Analyst]

Some simple ways might be to just subtract the mean and divide by the standard deviation. Of course those won't be as good as the papers you read because it's a very simple method.

[anshuman]

Yes this method works in normal scenarios..but during sudden illumination changes this fails... moreover i needed some tutorials on how to use the computer vision toolbox of MATLAB...the method of writing code is a bit different from the basic image processing toolbox because the previous one uses "objects".

[Image Analyst]

I don't know why it matters if the mean changes suddenly or not suddenly if you just subtract the mean of each frame from itself. But yes, I told you it's primitive and it you want something better you may have to just knuckle down and understand the math in the papers.

Yes the Computer Vision System Toolbox is more "object oriented" style of programming than the Image Processing Toolbox, and that will take some getting used to. I don't have the CVST toolbox. There are demos and examples provided that you can go through. Anand can also be a helpful resource for you.

[anshuman]

thanx a lot for the quick response :)

Answer 2

[Anand]

Go through the documentation links on this page:

http://www.mathworks.com/help/vision/object-detection.html

There are examples at the end of each function reference, which you can learn from. Also, the links at the end of the page pointing to Examples and How To are very instructional.

[anshuman]

thanx a lot for the quick response :)

[Adnan Farooq Awan]

illumination change can happen in static images or in videos?

[Image Analyst]

Yes. There's no guarantee that the illumination will be the same in frames or snapshots taken at different instances in time unless you take special care to control your illumination.