Face Detection on OS X and iOS

Recently I realized that Apple added support for face detection in OS X Lion and iOS 5. Apple’s face detection is exposed through Core Image, the super-useful image manipulation library. Two classes are important: CIDetector and CIFeature (along with its subclass, CIFaceFeature). With a little experimenting one night, I was able to get a sample app detecting faces within a static image in about 10 lines of code:

// Create the image
CIImage *image = [CIImage imageWithContentsOfURL:[NSURL fileURLWithPath:@"Photo.jpg"]];
 
// Create the face detector
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:CIDetectorAccuracyHigh, CIDetectorAccuracy, nil];
 
CIDetector *faceDetector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil options:options];
 
// Detect the faces
NSArray *faces = [faceDetector featuresInImage:image];
 
NSLog(@"%@", faces);

Comes with a more extended example

Panic Blog: Fun with Face Detection →

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