object recognition

  • Thread starter Andreas Viklund via DotNetMonster.com
  • Start date
A

Andreas Viklund via DotNetMonster.com

Hi!

I am a student at the University of Umea, Sweden and I am working on my
final project. I am developing an application in ASP.NET that takes an
image, that have been created with a digital camera or camera phone, and
processes it, to get data from it. The image taken by the user will be of a
square in some kind of magazine or newpaper, with a white background and
the border of the square should be black.

What I am trying to do is to find the square, or the corners of the square,
in the image, using ASP.NET code. If the user always took the picture
directly above the square without any rotation and blur this would not be a
big problem. But that is hardly not the case most of the times.

What I have managed to do so far is to convert the image to gray scale and
then made some kind of thresholding so I will end up with just white and
black pixels. This will make the square very visible in the image, but so
will other dark object, even if alot is taken out in the tresholding.

Finding one of the corners in the square, and always be positively sure
that you have found it, would solve alot. Then I think I can manage to do
the rest. In my solution now, I will sometimes find a corner, but it does
not work for many images.

Do you have an idea of how to solve this problem? I have tried different
ways of search for objects in the image by looking at all pixels, but I
really dont know how to see the difference between the corner of the square
and an object.

Is it possible to search for patterns in the image? like if I search the
image after objects that are similar to a corner of a square.

I would really like some help with this problem. if you follow these links
you can see a before and after picture of the image processing I have done
so far.

http://www.badaboom.se/test/earring2.jpg

http://www.badaboom.se/test/process.jpg

Best Regards

Andreas Viklund
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Members online

No members online now.

Forum statistics

Threads
473,744
Messages
2,569,484
Members
44,903
Latest member
orderPeak8CBDGummies

Latest Threads

Top