Ios autofucus or continuous focus

[fresla]

Hi, I hav an app that works fine but I need to add autofocus, or at least refocus. I dont mind if the user has to tap to trigger focus, or if it is constant autofocus.

I saw a few posts, the only recent ones I saw are:

iOS camera autofocus / full range focus?

Hi there, I’m building augmented reality app for an iPhone and so I need to use a camera on the device. It was pretty easy to set it up using ofVideoGrabber but my problem is that camera sets its field of focus at the launch and it is not what I want. Ideally, I would like to focus on short and long distances. If anyone knows a way to achieve this using openframeworks or objective c I would love to hear it! Thanks

and

iPhone 4s camera issues (maybe 5.1 beta issue?)

Looks like it may be linked to something in Lion…in the AvFoundationVideoGrabber.mm this is where the focus is declared in initGrabber: -(void) startCapture{ if( !bInitCalled ){ [self initCapture:60 capWidth:480 capHeight:320]; } [self.captureSession startRunning]; [captureInput.device lockForConfiguration:nil]; //if( [captureInput.device isExposureModeSupported:AVCaptureExposureModeAutoExpose] ) [captureInput.device setExposureMode:AVCaptureExposureModeAutoE…

I did not have any luck makign this work with an iphone 6.

Has anyone out there got a solution?

One road I started down is to try and make it myself with objective C, how could I get access to the captureInput.device (the avfoundation grabber) from my ofApp.cpp to apply focus?

[pierdr]

When I made artgram (https://itunes.apple.com/sa/app/artgram/id1251985477) I modified few OF classes to accept focus commands.

First of all, you can both set the focus to a specific distance (number between 0.0 and 1.0 where 0.0 is the closest distance and 1.0 is the furthest), or you can specify a set of XY coordinates for a location in your picture to set the focus point.

I added the following methods to
AVFoundationVideoGrabber

-(void)setAutofocusWithPointOfInterest:(CGPoint) p{

[captureInput.device setFocusMode:AVCaptureFocusModeAutoFocus];
[captureInput.device lockForConfiguration:nil];

[captureInput.device setFocusPointOfInterest:p];
[captureInput.device unlockForConfiguration];

}
-(void)setFocusManuallyTo:(float)newFocus{

 [captureInput.device lockForConfiguration:nil];
 [captureInput.device setFocusModeLockedWithLensPosition:newFocus completionHandler:^(CMTime syncTime) {     }];
 [captureInput.device unlockForConfiguration];

}

And I modiefied ofxiOSVideoGrabber to have the following methods:

void ofxiOSVideoGrabber::setAutofocusWithPointOfInterest(int x, int y){

grabber->setAutofocusWithPointOfInterest(CGPointMake(x,y));

}

void ofxiOSVideoGrabber::setFocusManuallyTo(float newFocus){

grabber->setFocusManuallyTo(newFocus);

}

So from OF you can just call:

videoFeed.getGrabber<ofxiOSVideoGrabber>()->setAutofocusWithPointOfInterest(0, 0);

or

videoFeed.getGrabber<ofxiOSVideoGrabber>()->setFocusManuallyTo(0.5);

[fresla]

Hey thanks that seems to work pretty well. In case anyone else sees this I had to wrap the objective C functions in AVFoundationVideoGrabber with C++ functions.

One thing that setFocusPointOfInterest needs a float between 0 and 1 for the position.

[raster_scape]

hello! after doing changes that pierdr suggests (and adding definitions in h file, i got an error:

Undefined symbols for architecture arm64:
“ofxiOSVideoGrabber::setAutofocusWithPointOfInterest(int, int)”, referenced from:
ofApp::touchDown(ofTouchEventArgs&) in ofApp.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

what can i do?
im very new to cpp and of, thank u for detailed answer