本文共 2664 字，大约阅读时间需要 8 分钟。
- (void)viewDidLoad
{
[super viewDidLoad];
UIImage *image = [UIImage imageNamed:@"faces1.png"];
_inputImageView.image = image;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)dealloc {
[_inputImageView release];
[_outputImageView release];
[_button release];
[super dealloc];
}
- (IBAction)detect:(id)sender {
CIContext *context = [CIContext contextWithOptions:nil];
UIImage *imageInput = [_inputImageView image];
CIImage *image = [CIImage imageWithCGImage:imageInput.CGImage];
//设置识别参数
NSDictionary *param = [NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh
forKey:CIDetectorAccuracy];
//声明一个CIDetector，并设定识别类型
CIDetector* faceDetector = [CIDetector detectorOfType:CIDetectorTypeFace
context:context options:param];
//取得识别结果
NSArray *detectResult = [faceDetector featuresInImage:image];
UIView *resultView = [[UIView alloc] initWithFrame:_inputImageView.frame];
[self.view addSubview:resultView];
for(CIFaceFeature* faceFeature in detectResult) {
//脸部
UIView* faceView = [[UIView alloc] initWithFrame:faceFeature.bounds];
faceView.layer.borderWidth = 1;
faceView.layer.borderColor = [UIColor orangeColor].CGColor;
[resultView addSubview:faceView];
[faceView release];
//左眼
if (faceFeature.hasLeftEyePosition) {
UIView* leftEyeView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 5)];
[leftEyeView setCenter:faceFeature.leftEyePosition];
leftEyeView.layer.borderWidth = 1;
leftEyeView.layer.borderColor = [UIColor redColor].CGColor;
[resultView addSubview:leftEyeView];
[leftEyeView release];
}
//右眼
if (faceFeature.hasRightEyePosition) {
UIView* rightEyeView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 5)];
[rightEyeView setCenter:faceFeature.rightEyePosition];
rightEyeView.layer.borderWidth = 1;
rightEyeView.layer.borderColor = [UIColor redColor].CGColor;
[resultView addSubview:rightEyeView];
[rightEyeView release];
}
//嘴巴
if (faceFeature.hasMouthPosition) {
UIView* mouthView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 5)];
[mouthView setCenter:faceFeature.mouthPosition];
mouthView.layer.borderWidth = 1;
mouthView.layer.borderColor = [UIColor redColor].CGColor;
[resultView addSubview:mouthView];
[mouthView release];
}
}
[resultView setTransform:CGAffineTransformMakeScale(1, -1)];
[resultView release];
if ([detectResult count] > 0)
{
CIImage *faceImage = [image imageByCroppingToRect:[[detectResult objectAtIndex:0] bounds]];
UIImage *face = [UIImage imageWithCGImage:[context createCGImage:faceImage fromRect:faceImage.extent]];
self.outputImageView.image = face;
[self.button setTitle:[NSString stringWithFormat:@"识别 人脸数 %i",
[detectResult count]] forState:UIControlStateNormal];
}
}
@end
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