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我正在使用IOS的CoreImage框架進行人臉檢測。示例代碼工作正常。但是，當我從照片庫中加載ImagePicker的圖像時，它不會執行正確的人臉檢測。 這裏是我使用人臉檢測代碼：當ImagePicker的圖像無法檢測臉部特徵
-(void)openCamera
{
picker_ = [[UIImagePickerController alloc] init];
picker_.delegate = (id)self;
picker_.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
picker_.wantsFullScreenLayout = YES;
[self presentViewController:picker_ animated:YES completion:nil];
picker_=nil;
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[picker dismissModalViewControllerAnimated:YES];
imgVw_User.image = [info objectForKey:UIImagePickerControllerOriginalImage];
[picker dismissModalViewControllerAnimated:YES];
[self faceDetector];
}
-(void)faceDetector
{
// Draw the face detection image
[self.view addSubview:imgVw_User];
// imgVw_User.image=[UIImage imageNamed:@"73_Before_Fractional_Skin_Resurfacing.jpg"];
// Execute the method used to markFaces in background
[self performSelectorInBackground:@selector(markFaces:) withObject:imgVw_User];
// flip image on y-axis to match coordinate system used by core image
[imgVw_User setTransform:CGAffineTransformMakeScale(1, -1)];
// flip the entire window to make everything right side up
[self.view setTransform:CGAffineTransformMakeScale(1, -1)];
}
-(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]];
// create an array containing all the detected faces from the detector
NSArray* features = [detector featuresInImage:image];
// 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)
{
// 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];
}
}
}
如果我改變它來源於imagePicker到應用程序中的靜態圖像，即73_Before_Fractional_Skin_Resurfacing.jpg的圖像，然後檢測是否正確。問題出在圖像來自圖庫時，即從ImagePicker。 請諮詢..
你從imagePicker檢查實際的圖像恢復使用圖像？ generatePhotoThumbnail在做什麼？如果您從imagePicker保存圖像，然後將其手動重新加載爲靜態圖像，那好嗎？ – foundry
@HeWas - Tha是我的一個小實驗。即使我使用精確的圖像，它不起作用。 – NiKKi