face detection iOS from camera

Question

I receive an image view

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSString *mediaT         


        

Answer 1

small Correction here

- (void) detectForFaces:(UIImage *)facePicture orientation:(UIImageOrientation)orientation {


CIImage* image = [CIImage imageWithCGImage:facePicture.CGImage];

CIContext *context = [CIContext contextWithOptions:nil];                    // 1
NSDictionary *opts = @{ CIDetectorAccuracy : CIDetectorAccuracyLow };      // 2
CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace
                                          context:context
                                          options:opts];                    // 3

int exifOrientation;
switch (orientation) {
    case UIImageOrientationUp:
        exifOrientation = 1;
        break;
    case UIImageOrientationDown:
        exifOrientation = 3;
        break;
    case UIImageOrientationLeft:
        exifOrientation = 8;
        break;
    case UIImageOrientationRight:
        exifOrientation = 6;
        break;
    case UIImageOrientationUpMirrored:
        exifOrientation = 2;
        break;
    case UIImageOrientationDownMirrored:
        exifOrientation = 4;
        break;
    case UIImageOrientationLeftMirrored:
        exifOrientation = 5;
        break;
    case UIImageOrientationRightMirrored:
        exifOrientation = 7;
        break;
    default:
        break;
}


opts = @{ CIDetectorImageOrientation :[NSNumber numberWithInt:exifOrientation
                                       ] };

NSArray *features = [detector featuresInImage:image options:opts];

if ([features count] > 0) {
    CIFaceFeature *face = [features lastObject];
    NSLog(@"%@", NSStringFromCGRect(face.bounds));
}}

UIImage *image = // some image here; [self detectForFaces:image orientation:image.imageOrientation];

send only image not image.CGImage This worked for me