CIDetector在面部特征上给出错误的位置

现在我知道坐标系已经搞乱了。我曾尝试颠倒视图和imageView，什么都没有。然后我试图扭转function上的坐标，我仍然得到同样的问题。我知道它会检测到脸部，眼睛和嘴巴，但是当我尝试从样本代码中放置重叠的盒子时，它们不在位置（确切地说，它们在屏幕右侧）。我难以理解为什么会发生这种情况。

我张贴一些代码，因为我知道你们中的一些人喜欢特异性：

-(void)faceDetector { // Load the picture for face detection // UIImageView* image = [[UIImageView alloc] initWithImage:mainImage]; [self.imageView setImage:mainImage]; [self.imageView setUserInteractionEnabled:YES]; // Draw the face detection image // [self.view addSubview:self.imageView]; // Execute the method used to markFaces in background // [self performSelectorInBackground:@selector(markFaces:) withObject:self.imageView]; // flip image on y-axis to match coordinate system used by core image // [self.imageView setTransform:CGAffineTransformMakeScale(1, -1)]; // flip the entire window to make everything right side up // [self.view setTransform:CGAffineTransformMakeScale(1, -1)]; // [toolbar setTransform:CGAffineTransformMakeScale(1, -1)]; [toolbar setFrame:CGRectMake(0, 0, 320, 44)]; // Execute the method used to markFaces in background [self performSelectorInBackground:@selector(markFaces:) withObject:_imageView]; // [self markFaces:self.imageView]; } -(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 - since speed is not an issue we'll use a high accuracy // detector CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey:CIDetectorAccuracy]]; // CGAffineTransform transform = CGAffineTransformMakeScale(1, -1); CGAffineTransform transform = CGAffineTransformMakeScale(self.view.frame.size.width/mainImage.size.width, -self.view.frame.size.height/mainImage.size.height); transform = CGAffineTransformTranslate(transform, 0, -self.imageView.bounds.size.height); // create an array containing all the detected faces from the detector NSDictionary* imageOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:6] forKey:CIDetectorImageOrientation]; NSArray* features = [detector featuresInImage:image options:imageOptions]; // NSArray* features = [detector featuresInImage:image]; NSLog(@"Marking Faces: Count: %d", [features count]); // we'll iterate through every detected face. CIFaceFeature provides us // with the width for the entire face, and the coordinates of each eye // and the mouth if detected. Also provided are BOOL's for the eye's and // mouth so we can check if they already exist. for(CIFaceFeature* faceFeature in features) { // create a UIView using the bounds of the face // UIView* faceView = [[UIView alloc] initWithFrame:faceFeature.bounds]; CGRect faceRect = CGRectApplyAffineTransform(faceFeature.bounds, transform); // get the width of the face // CGFloat faceWidth = faceFeature.bounds.size.width; CGFloat faceWidth = faceRect.size.width; // create a UIView using the bounds of the face UIView *faceView = [[UIView alloc] initWithFrame:faceRect]; // 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.imageView addSubview:faceView]; NSLog(@"Face -> X: %f, Y: %f, W: %f, H: %f",faceRect.origin.x, faceRect.origin.y, faceRect.size.width, faceRect.size.height); if(faceFeature.hasLeftEyePosition) { // create a UIView with a size based on the width of the face CGPoint leftEye = CGPointApplyAffineTransform(faceFeature.leftEyePosition, transform); UIView* leftEyeView = [[UIView alloc] initWithFrame:CGRectMake(leftEye.x-faceWidth*0.15, leftEye.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:leftEye]; // round the corners leftEyeView.layer.cornerRadius = faceWidth*0.15; // add the view to the window [self.imageView addSubview:leftEyeView]; NSLog(@"Has Left Eye -> X: %f, Y: %f",leftEye.x, leftEye.y); } if(faceFeature.hasRightEyePosition) { // create a UIView with a size based on the width of the face CGPoint rightEye = CGPointApplyAffineTransform(faceFeature.rightEyePosition, transform); UIView* leftEye = [[UIView alloc] initWithFrame:CGRectMake(rightEye.x-faceWidth*0.15, rightEye.y-faceWidth*0.15, faceWidth*0.3, faceWidth*0.3)]; // change the background color of the eye view [leftEye setBackgroundColor:[[UIColor yellowColor] colorWithAlphaComponent:0.3]]; // set the position of the rightEyeView based on the face [leftEye setCenter:rightEye]; // round the corners leftEye.layer.cornerRadius = faceWidth*0.15; // add the new view to the window [self.imageView addSubview:leftEye]; NSLog(@"Has Right Eye -> X: %f, Y: %f", rightEye.x, rightEye.y); } // 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.imageView addSubview:mouth]; // } } }

我知道代码段有点长，但这是它的主要要点。他们只有其他相关的事情是，我有一个UIImagePickerController，让用户select一个现有的图像或采取一个新的select。然后，图像被设置到屏幕的UIImageView中，与各种框和圆一起显示，但没有运气显示出来：/

任何帮助，将不胜感激。谢谢〜

更新：

我现在添加了一张现在的照片，这样你们可以有一个想法，我应用了新的缩放，这个缩放比我想要的更好，但是没有任何改变。

错误的脸和眼睛的位置

只需使用Apple的SquareCam应用程序中的代码即可。它在正面和背面摄像头的任何方向上都能正确alignment方块。沿着faceRect插入正确的眼睛和嘴巴的位置。注意：您必须将x位置与脸部特征中的y位置交换。不知道为什么你必须做交换，但是给了你正确的位置。

除非图像视图与图像具有完全相同的大小，否则您的变换缺less比例。从…开始

  CGAffineTransformMakeScale( viewWidth / imageWidth, - viewHeight / imageHeight )

其中viewWidth和viewHeight是您的视图的大小， imageWidth和imageHeight是您的图像的大小。

所以在玩过@Sven之后，我想通了。

 CGAffineTransform transform = CGAffineTransformMakeScale(self.imageView.bounds.size.width/mainImage.size.width, -self.imageView.bounds.size.height/mainImage.size.height); transform = CGAffineTransformRotate(transform, degreesToRadians(270));

我必须调整转换大小bw的图像大小和imageview的大小然后由于某种原因，我不得不旋转它，但它现在完美