Go Back   MacRumors Forums > Apple Systems and Services > Programming > Mac Programming

Reply
 
Thread Tools Search this Thread Display Modes
Old Feb 2, 2009, 04:30 AM   #1
vibhor80
macrumors newbie
 
Join Date: Feb 2009
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
vibhor80 is offline   0 Reply With Quote
Old Feb 2, 2009, 09:36 AM   #2
Bakerman
macrumors member
 
Join Date: Jan 2005
Location: Sweden
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.
Bakerman is offline   0 Reply With Quote
Old Feb 2, 2009, 10:43 AM   #3
mags631
Guest
 
Join Date: Mar 2007
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.
mags631 is offline   0 Reply With Quote
Old Feb 2, 2009, 05:34 PM   #4
autorelease
macrumors regular
 
Join Date: Oct 2008
Location: Achewood, CA
If the phrase "convolution matrix" is not familiar to you, this is probably something you shouldn't be attempting.
autorelease is offline   0 Reply With Quote
Old Feb 2, 2009, 06:52 PM   #5
gnasher729
macrumors G5
 
gnasher729's Avatar
 
Join Date: Nov 2005
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.
gnasher729 is offline   0 Reply With Quote
Old Feb 2, 2009, 10:53 PM   #6
vibhor80
Thread Starter
macrumors newbie
 
Join Date: Feb 2009
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.
vibhor80 is offline   0 Reply With Quote
Old Feb 2, 2009, 11:21 PM   #7
eddietr
macrumors 6502a
 
Join Date: Oct 2006
Location: Virginia
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.
eddietr is offline   0 Reply With Quote
Old Feb 3, 2009, 02:17 AM   #8
MacRohde
macrumors regular
 
Join Date: Jun 2004
Location: Copenhagen, Denmark
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.
__________________
My main systems: iMac 2.7 GHz (Mountain Lion), iPad 2, iPhone 4S.
MacRohde is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Systems and Services > Programming > Mac Programming

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
iMessage detection woes? Bowsa2511 iPhone 3 Nov 21, 2013 12:35 PM
500px for iOS Updated with New Edge-to-Edge Design, Inline Swipe Gestures MacRumors iOS Blog Discussion 23 Oct 8, 2013 11:29 PM
iMessage detection. N-Y iOS 7 3 Sep 21, 2013 03:30 PM
Best edge to edge screen protector flamingoezz iPhone Accessories 6 Jun 28, 2013 03:27 PM
What do y'all think about edge-to-edge screens with virtual bezels? Yr Blues iPad 14 Oct 21, 2012 02:01 PM

Forum Jump

All times are GMT -5. The time now is 08:06 AM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC