I should able to capture multiple images (assume I am capturing passport for id proof) using iOS camera AVFoundation. I mean to say that I should have one interface to capture them one by one and merge them together. Is this possible in iOS, if yes is there any samples available for that.
Any help could be appreciated. Thank you
Can't completely get it. You can just take image from photostream one by one, you can take one photo and cut out 2 images, you can use imagepicker to call native camera, where is problem my friend?
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I have an app, in which i need to split a video into two parts and then concatinate one part with another video.
could any one of you tell me how to split a video into two parts based on duaration.
Thank you
You can use AVFoundation classes and check the editability of your video through UIVideoEditor classes
I'm trying to capture one or more UIImages programmatically using AVFoundation.
I set up the sessions and input devices and everything, but when I try to find explanations on how to actually take the photos, all I get is buffeled information about connections and what not.
I couldn't find a single example of actually taking photos and saving it to UIImage for further processing. All the example use a constant kCGImagePropertyExifDictionary Which doesn't seems to exist in iOS 5 SDK..
Can someone please provide me with a code or an explanation from top to bottom on how to take and save an image from the front facing camera to a UIImage using AVFoundation?
Thanks alot!
To use kCGImagePropertyExifDictionary, you should #import <ImageIO/ImageIO.h>.
All of the other information you seek is inside the AVFoundation Programming guide - particularly the Media Capture section.
OK so I want to record the screen of a Mac directly to a .mov or .m4v. I've taken a look at Son of Grab from Apple, but I would prefer not to deal with screenshots and individual images and just work with video.
I thought there should be something in QTKit but I can't find it. I know this can be done in OpenGL, but 1) I don't know how and 2) I'd like to avoid that if possible.
Just to elaborate, I am recording from iSight using QTCaptureDeviceInput and (obviously a QTDevice) because I need to solution to work on Snow Leopard.
It seems like there should be a way to just target the screen as the input device for QTMediaTypeVideo.
Any help would be greatly appreciated.
You can use AVFoundation to do screen recording on the Mac. It's only available on 10.7 though.
You can use CGDisplayCreateImage/CGDisplayCreateImageFromRect APIs (10.6+) to obtain still images of screen and then making a movie out of them.
I'm not sure how good will be the performance though.
I have found that when faced with the question, will it be fast enough or not, just give it a try. Do a quick test by gabbing frame after frame say 1000 times and time it. CGDisplayCreateImageFromRect is not that hard to call at all. I have called it for single screen shots of the whole screen when the mouse was clicked, and it hardly slowed my mac down (only a basic dual core machine).
Apple has two samples showing the main two ways this can be done: :-
ScreenSnapshot
SonOfGrab
It would be easy to modify these to do it say 1000 times in a loop!
I'm basically trying to work out how to take a slice of an image, say a screenshot of an iPhone home screen, slice out the first icon and compare it to a set array of images in a library. Any help on where to start?
I'm no iPhone programmer, but I might be able to suggest a few things:
The SURF feature detection implemented in OpenCV should help you with this
There is a nice article on using OpenCV in Objective-C code.
A quick & dirty way might be to use the difference blend mode which should return the difference between the 1st image(top) and the 2nd image(bottom). If there is no difference the result will be completely black. So, the more black pixels in the difference result, potentially, the more similarities between the compared images.
I'm not an iOS developer, so I don't know if there is an image library that ships with sdk or if there's a free/opensource library for basic image processing. Still this should be trivial to implement:
e.g.
- (int)difference((int)topPixel,(int)bottomPixel)
{
return abs(topPixel-bottomPixel);
}
Note: Syntax might not be correct :)
HTH
This may not help you with taking a screenshot of the iOS home screen... But these articles show how to take snapshots from within a UIKit application:
https://developer.apple.com/library/prerelease/ios/#qa/qa1703/_index.html
https://developer.apple.com/library/prerelease/ios/#qa/qa1714/_index.html
Perhaps you would instruct the user to press home-power (buttons) to take a snapshot and store in the photo roll, then load that screenshot into an app to process the screenshot.
Hope this helps!
What is the best way to create a numeric pad like the one Apple uses in the telephone app?
I would say just create an array of UIButton objects so that you can utilize UIControlStateSelected and the other button states by using different images for different states.
Another idea is to create something similar to that entire keypad in Photoshop, and then tile it into 12 images using http://www.mikelin.ca/blog/2010/06/iphone-splitting-image-into-tiles-for-faster-loading-with-imagemagick/
That would take some of the work out of get all the images to flow nicely together.
By the way, I just forgot about these until just a minute ago... they have some of the UI graphics from the iPhone and iPad in high res PSD file:
http://www.teehanlax.com/blog/2010/02/01/ipad-gui-psd/
and
http://www.teehanlax.com/blog/2010/08/12/iphone-4-gui-psd-retina-display/
and
http://www.teehanlax.com/blog/2010/06/14/iphone-gui-psd-v4/
I implemented a KeypadView, that is customizable via a delegate.
This github repository has the KeypadView and a delegate-implementation.
As I am still beginner in the field of iOS development I would appreciate, if you share your thoughts with me.