[iOS]CIDetector之CIDetectorTypeFaceFace Service，cidetectorFace Service

[iOS]CIDetector之CIDetectorTypeFaceFace Service，cidetectorFace Service

- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];    imageView.image = [UIImage imageNamed:@"timg.jpeg"];    [self.view addSubview:imageView];        CGFloat width = imageView.image.size.width;    CGFloat height = imageView.image.size.height;        CGFloat sWidth = imageView.bounds.size.width;    CGFloat sHeight = imageView.bounds.size.height;        CGFloat x = width/sWidth;    CGFloat y = height/sHeight;        // 根據image修改imageview的frame    if (x > y)    {        imageView.frame = CGRectMake(0, (sHeight-height/x)/2, sWidth, height/x);    }else{        imageView.frame = CGRectMake((sWidth-width/y)/2, 0, width/y, sHeight);    }        // 壓縮image    UIGraphicsBeginImageContext(CGSizeMake(imageView.bounds.size.width , imageView.bounds.size.height));    [imageView.image drawInRect:CGRectMake(0, 0, imageView.bounds.size.width, imageView.bounds.size.height)];    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();        imageView.image = scaledImage;        //識別    dispatch_async(dispatch_get_global_queue(0, 0), ^{        CIImage *cImage = [CIImage imageWithCGImage:imageView.image.CGImage];        // 設定識別模式        NSDictionary  *opts = [NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh                                                          forKey:CIDetectorAccuracy];        /* Lower accuracy, higher performance */        //CORE_IMAGE_EXPORT NSString* const CIDetectorAccuracyLow NS_AVAILABLE(10_7, 5_0);                /* Lower performance, higher accuracy */        //CORE_IMAGE_EXPORT NSString* const CIDetectorAccuracyHigh NS_AVAILABLE(10_7, 5_0);                CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace                                                  context:nil                                                  options:opts];                NSArray *features = [detector featuresInImage:cImage];                if ([features count] == 0)        {            dispatch_async(dispatch_get_main_queue(), ^{                NSLog(@"檢測失敗");            });            return ;        }                for (CIFaceFeature *feature in features)        {            // 是否微笑            BOOL smile = feature.hasSmile;                        NSLog(smile ? @"微笑" : @"沒微笑");                        // 眼睛是否睜開            BOOL leftEyeClosed = feature.leftEyeClosed;            BOOL rightEyeClosed = feature.rightEyeClosed;                        NSLog(leftEyeClosed ? @"左眼沒睜開" : @"左眼睜開");            NSLog(rightEyeClosed ? @"右眼沒睜開" : @"右眼睜開");                        // 擷取臉部frame            CGRect rect = feature.bounds;            rect.origin.y = imageView.bounds.size.height - rect.size.height - rect.origin.y;// Y軸旋轉180度            faceRect = rect;            NSLog(@"臉 %@",NSStringFromCGRect(rect));                        // 左眼            if (feature.hasLeftEyePosition)            {                CGPoint eye = feature.leftEyePosition;                eye.y = imageView.bounds.size.height - eye.y;// Y軸旋轉180度                NSLog(@"左眼 %@",NSStringFromCGPoint(eye));            }                        // 右眼            if (feature.hasRightEyePosition)            {                CGPoint eye = feature.rightEyePosition;                eye.y = imageView.bounds.size.height - eye.y;// Y軸旋轉180度                NSLog(@"右眼 %@",NSStringFromCGPoint(eye));            }                        // 嘴            if (feature.hasMouthPosition)            {                CGPoint mouth = feature.mouthPosition;                mouth.y = imageView.bounds.size.height - mouth.y;// Y軸旋轉180度                NSLog(@"嘴 %@",NSStringFromCGPoint(mouth));            }        }                dispatch_async(dispatch_get_main_queue(), ^{            NSLog(@"檢測完成");            UIView *view = [[UIView alloc] initWithFrame:faceRect];            view.backgroundColor = [UIColor blueColor];            view.alpha = 0.3;            [imageView addSubview:view];        });    });}

關於圖片壓縮：imageview的大小與image的大小不一致，識別的時候，是按照image的大小進行計算，通過重繪，使imageview與image保持一致。

關於座標Y軸翻轉：螢幕的座標原點即(0,0)點在左上方，識別圖片的座標原點在左下角。

運行結果

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