现在我知道坐标系搞砸了。我试过颠倒视图和imageView，什么都没有。然后我尝试反转特征上的坐标，但我仍然遇到同样的问题。我知道它会检测到人脸、眼睛和嘴巴，但是当我尝试从示例代码中放置覆盖框时，它们不在位置上（准确地说，它们在屏幕外的右侧）。我很困惑为什么会这样。
我会发布一些代码，因为我知道你们中的一些人喜欢这种特殊性：
-(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，但这就是它的主要要点。他们唯一与此相关的另一件事是我有一个 UIImagePickerController，它让用户可以选择选择现有图像或拍摄新图像。然后将图像设置到屏幕的 UIImageView 中，与各种框和圆圈一起显示，但没有运气显示它们：/
任何帮助，将不胜感激。谢谢~
更新：
我添加了一张它现在所做的照片，所以你们可以有一个想法，我应用了新的缩放，它工作得更好一点，但远不及我想要的。
