what is the best library for shape recognition on IOS SDK ? is openCV working with IOS SDK ?
I want to recognize lines and squares and circles i don't need to recognize letters or numbers
Yes, OpenCV works fine with the official iOS SDK; it works best with Xcode (it is quite complicated to install it properly with a non-official toolchain, though).
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In Titanium I found that the labels in the Android version have quite different amount of padding to the iOS version.
How can I normalise them so they look the same in both?
I have an app which uses AVFoundation and tracks the face, eyes, and mouth position. I use the CIFaceFeature to detect these and mark them on the screen.
Is there a simple way to detect a wink using the framework?
For iOS 7, Yes, now you can do it with CoreImage.
Here is the API diff in iOS 7 Beta 2:
CoreImage
CIDetector.h
Added CIDetectorEyeBlink
Added CIDetectorSmile
Before iOS 7:
No, there is no way with iOS frameworks (AVFoundation or CoreImage) for now.
You can check out with OpenCV... but it's more of a researchy topic, not guarantee to work well in different situations:
First, you need to build a eye close/open classifier, afaik, there is no build-in eye wink classifier in OpenCV, so you need to collect enough "close" and "open" samples, and train a binary classifier. (I would suggest using Principle Component Analysis + Support Vector Machine. Both are available in OpenCV)
Then in iOS, use CoreImage to detect the locations of both eyes. And cut a square patch image around the eye center. The size of the patch should be normalized in terms of the detected face bounds rectangle.
And then you need to convert UIImage/CIImage to OpenCV IplImage or CvMat format, and feed them into your OpenCV classifier to determine the eyes are open or close.
Finally, determine if there is a wink based on the sequence of eye open and close.
(You also need to check if the processing frame rate is able to pick a wink action: say the wink happens within 0.5 frame... then you'll never detect it...)
It's a hard problem... otherwise Apple would have already included them in the framework.
I need to create an iOS 5 application will run on iPad2 (I can use private API because the App will not be released in App Store) will show live stream from front camera, recognize eyes and render a pair of glasses (I have the 3D model) following face movements.
Which is the best approach and the best technology (e.g. OpenGL ES) I can use?
Just use the libraries included in XCode. I have a sample here. It's got everything you need.
It uses the AVFoundation, CoreImage, CoreMedia, and CoreVideo frameworks.
I am developing an iPhone game with Cocos2d-iphone.
I want my game to only be available to the iPhone 4 AND iPad. Retina enabled for iPhone 4. I don't want the game to run on older devices.
Cocos2d will always ask me for -hd and non-hd files. If I don't provide the SD files, I get errors. I don't want that: is there a way to disable Cocos2d from trying to retrieve SD files, and only get -hd suffixed files by default?
Oh, and when the game is run by an iPad, the graphics will be the -hd ones as well. So the point is, I only want to have -hd files in my project.
What are the proper steps to edit Cocos2d's source for such?
If you are using cocos2d version >= 2.0, then you can change the value of a global variable found in CCFileUtils.h:
static NSString *__suffixiPad =#"-hd";
(Its default value is #"-ipad".)
If you are using cocos2d version < 2.0, then you can find here a category that I wrote to be able to transparently use -hd images created for the iPhone 4 on the iPad 1/2.
Actually, it does more than that, but if you add it to your project, then "-hd" images will be "automagically" used on the iPad 1/2 instead of their SD versions (which you could also not include in your project).
Let me know if you have any issues integrating this code.
If I would have been at your place.. I would have played with a trick.. Don't down vote the answer if you don't like.. But Its just a thing in my mind.
Use -hd images in the code directly.. iPhone 4 will handle it easily.. Older iPhones will show it much larger and it doesn't matter as you are not supporting them...
So instead of using Background.png , directly use Background-hd.png as it will work fine for iPhone 4.. Instead of wasting time on all these SD stuff.. I will directly use my -hd images for my work...
I can not say about new iPad.. But old iPad can easily use -hd images in code as you want.. For iPad I have directly used in my code earlier..
Hope this helps.. :)
This tutorial might help.
If you only provide -hd assets, you should only get errors regarding missing SD assets when running on iPad. The iPad doesn't have a Retina display, but it certainly is high resolution enough to be treated like one.
Since cocos2d passes all filename requests through the fullPathFromRelativePath function in CCFileUtils it may be enough to modify this function to treat the iPad like an HD device and force it to load -hd assets on iPad.
the 1st idea i can think of is to use #2x suffix for images (UIKit style) and you wont need to enable retina display in app.The problem is that on the ipad you'll have to write your own method to remove #2x suffix
the 2nd idea was to make a SD image..but only 1x1 pixels... it takes virtually no space at all ( 119 bytes with white pixel). Should work on ipad as-is
3rd idea:don't enable (or enable..doesn't make any difference) retina display but have the HD images as SD images.I've tested this on cocos2d v1.0.1 and it seems to work.Also..it should work on ipad
4th idea forcefully enable retina display in ccConfig.h (so that director won't ask you for the SD images on ipad) .I'm not sure about this one because there are quite a few tests that check for resolution, device and if it's retina and you'd have to edit all of them
these are just ideas off the top of my head..they may be wrong..but they're just ideas
I want to use 'marker reader' technology in my iPhone application (you have a piece of paper, you point the iphone camera at it and information is bein drawn up from it). What API kits can i use/are availible?
The closest SDK I can think of is ARToolKit which should help in a Framework Solution for finding Markers and deriving information. There are a couple of other Frameworks which could be used and I've listed below:
Layar
ARToolKit
Popcode
SGAREnvironment