Question

我从相机拍摄图像（使用UIImagePickerController）并将其保存到文档目录。

然后，我使用CIDetector API和CIfacefeature API在不同的视图控制器中获取这些图像以获取面部部分。

问题是虽然我能够正确地获取图像，但它根本没有检测到脸部。如果我在主包中存储相同的图像，它会检测到。

我不知道问题出在哪里??我尝试了一切。可能问题在于UIImage，或者可能是图像保存在文档目录或相机中的格式。

请帮忙。我将感激你。

- (void) imagePickerController:(UIImagePickerController *)picker       didFinishPickingMediaWithInfo:(NSDictionary *)info
{
   UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
                                                         NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString* path = [documentsDirectory stringByAppendingPathComponent: 
                      [NSString stringWithString: @"SampleImage.jpg"] ];
    NSData* data = UIImageJPEGRepresentation(image, 0);
    [data writeToFile:path atomically:YES];
    [picker  dismissModalViewControllerAnimated:YES];
    FCVC *fcvc = [[FCVC alloc] initwithImage:image];

    [self.navigationController pushViewController:fcvc animated:YES];
}

在FCVC的ViewDidLoad中，我通过传递以下函数调用函数：

-(void)markFaces:(UIImage *)pic 
{
    CIImage* image = [CIImage imageWithCGImage:pic.CGImage];
    CGImageRef masterFaceImage;

    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];
   for(CIFaceFeature* faceFeature in features)
   {       
        masterFaceImage  =  CGImageCreateWithImageInRect(facePicture.CGImage,CGRectMake(faceFeature.bounds.origin.x,faceFeature.bounds.origin.y, faceFeature.bounds.size.width,faceFeature.bounds.size.height));
   }
   self.masterExtractedFace = [UIImage imageWithCGImage:masterFaceImage];
}

先谢谢。

Answer 1

对此的一个简单修复，如果你总是以肖像方式使用相机，就是添加这个小片段：

NSDictionary* imageOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:6] forKey:CIDetectorImageOrientation];
NSArray* features = [detector featuresInImage:image options:imageOptions];

如果您需要动态找出方向，请确定您所处的方向。

检查kCGImagePropertyOrientation

如果从相机拍摄使用UIImagePickerControllerSourceTypeCamera，则不会检测到图像

1 个答案: