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Old Feb 2, 2009, 03:30 AM   #1
vibhor80
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Edge detection in cocoa

Hey everyone,

There are plenty of examples on the web of how to process the image.
I want to detect any object in image(such as hand, face etc). I am unable to detect the object.
If anyone know how to code one help would be greatly appreciated.

Vibhor Bhatnagar
vibhor80@gmail.com
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Old Feb 2, 2009, 08:36 AM   #2
Bakerman
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What do you mean by "detect"?

There are a number of filters that you can apply that make objects, or the edges of objects, stand out more from the background. Once you've chosen a set of filters and applied them, you still have to apply an algorithm to find out where in the image your objects are located.

Unfortunately this is not a trivial problem and you need quite a lot of a priori knowledge of the image to achieve good results.
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Old Feb 2, 2009, 09:43 AM   #3
mags631
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Any object? So, you are requesting for help on how to perform arbitrary object detection? Right. My first recommendation is to search for "arbitrary object detection algorithm" in Google and read. You may want to reconsider this goal -- this is not for the hobbyist.
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Old Feb 2, 2009, 04:34 PM   #4
autorelease
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If the phrase "convolution matrix" is not familiar to you, this is probably something you shouldn't be attempting.
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Old Feb 2, 2009, 05:52 PM   #5
gnasher729
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Quote:
Originally Posted by vibhor80 View Post
Hey everyone,

There are plenty of examples on the web of how to process the image.
I want to detect any object in image(such as hand, face etc). I am unable to detect the object.
If anyone know how to code one help would be greatly appreciated.

Vibhor Bhatnagar
vibhor80@gmail.com
I guess instead of posting at MacRumors you should go to the nearest university library.
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Old Feb 2, 2009, 09:53 PM   #6
vibhor80
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Quote:
Originally Posted by Bakerman View Post
What do you mean by "detect"?

There are a number of filters that you can apply that make objects, or the edges of objects, stand out more from the background. Once you've chosen a set of filters and applied them, you still have to apply an algorithm to find out where in the image your objects are located.

Unfortunately this is not a trivial problem and you need quite a lot of a priori knowledge of the image to achieve good results.
Thanks, for your suggestion. If you have any sample example please forward to me or if you provide me small code snipped then its good for me.
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Old Feb 2, 2009, 10:21 PM   #7
eddietr
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Quote:
Originally Posted by vibhor80 View Post
Thanks, for your suggestion. If you have any sample example please forward to me or if you provide me small code snipped then its good for me.
"small code"??

What you've described is by no means a small or simple thing. That's what everyone is trying to tell you.
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Old Feb 3, 2009, 01:17 AM   #8
MacRohde
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What you are trying to do is something one might do as a thesis project - so asking us for code samples is ludicrous.

Object recognition and segmentation is one of the big problems in image processing - not matter what you might see on TV it really is a very very hard task.

So, if you really are interesting in it, you would have to learn a lot of image prcessing - for starters check out the chapter "Image Segmentation" in "Digital Image Processing" by Gonzalez & Woods.
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