我正在尝试制作一个人脸识别应用程序，一旦它检测到他的脸，它就会识别出这个人。我已经完成了面部检测部分，但我找不到将面部与存储在应用程序中的相册中的照片进行比较的方法。
下面是人脸检测代码：
-(void)markFaces:(UIImageView *)facePicture
{
// draw a CI image with the previously loaded face detection picture
CIImage* image = [CIImage imageWithCGImage:facePicture.image.CGImage];
// create a face detector
CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeFace
context:nil options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey:CIDetectorAccuracy]];
// create an array containing all the detected faces from the detector
NSArray* features = [detector featuresInImage:image];
for(CIFaceFeature* faceFeature in features)
{
// get the width of the face
CGFloat faceWidth = faceFeature.bounds.size.width;
// create a UIView using the bounds of the face
UIView* faceView = [[UIView alloc] initWithFrame:faceFeature.bounds];
// add a border around the newly created UIView
faceView.layer.borderWidth = 1;
faceView.layer.borderColor = [[UIColor redColor] CGColor];
// add the new view to create a box around the face
[self.view addSubview:faceView];
if(faceFeature.hasLeftEyePosition)
{
// create a UIView with a size based on the width of the face
UIView* leftEyeView = [[UIView alloc] initWithFrame:CGRectMake(faceFeature.leftEyePosition.x-faceWidth*0.15, faceFeature.leftEyePosition.y-faceWidth*0.15, faceWidth*0.3, faceWidth*0.3)];
// change the background color of the eye view
[leftEyeView setBackgroundColor:[[UIColor blueColor] colorWithAlphaComponent:0.3]];
// set the position of the leftEyeView based on the face
[leftEyeView setCenter:faceFeature.leftEyePosition];
// round the corners
leftEyeView.layer.cornerRadius = faceWidth*0.15;
// add the view to the window
[self.view addSubview:leftEyeView];
}
if(faceFeature.hasRightEyePosition)
{
// create a UIView with a size based on the width of the face
UIView* leftEye = [[UIView alloc] initWithFrame:CGRectMake(faceFeature.rightEyePosition.x-faceWidth*0.15, faceFeature.rightEyePosition.y-faceWidth*0.15, faceWidth*0.3, faceWidth*0.3)];
// change the background color of the eye view
[leftEye setBackgroundColor:[[UIColor blueColor] colorWithAlphaComponent:0.3]];
// set the position of the rightEyeView based on the face
[leftEye setCenter:faceFeature.rightEyePosition];
// round the corners
leftEye.layer.cornerRadius = faceWidth*0.15;
// add the new view to the window
[self.view addSubview:leftEye];
}
if(faceFeature.hasMouthPosition)
{
// create a UIView with a size based on the width of the face
UIView* mouth = [[UIView alloc] initWithFrame:CGRectMake(faceFeature.mouthPosition.x-faceWidth*0.2, faceFeature.mouthPosition.y-faceWidth*0.2, faceWidth*0.4, faceWidth*0.4)];
// change the background color for the mouth to green
[mouth setBackgroundColor:[[UIColor greenColor] colorWithAlphaComponent:0.3]];
// set the position of the mouthView based on the face
[mouth setCenter:faceFeature.mouthPosition];
// round the corners
mouth.layer.cornerRadius = faceWidth*0.2;
// add the new view to the window
[self.view addSubview:mouth];
}
}
}
-(void)faceDetector
{
// Load the picture for face detection
UIImageView* image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"testpicture.png"]];
// Draw the face detection image
[self.view addSubview:image];
// Execute the method used to markFaces in background
[self performSelectorInBackground:@selector(markFaces:) withObject:image];
// flip image on y-axis to match coordinate system used by core image
[image setTransform:CGAffineTransformMakeScale(1, -1)];
// flip the entire window to make everything right side up
[self.view setTransform:CGAffineTransformMakeScale(1, -1)];
}