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我正在从相机中获取图像（利用UIImagePickerController）并将其保存到文档目录中。

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

问题是尽管我能够正确获取图像，但它根本没有检测到面部。如果我将相同的图像存储在它检测到的主包中。

不知道问题出在哪里？？？。我已经尝试了一切。可能是问题出在UIImage或可能是图像保存在文档目录或相机中的格式。

请帮忙。我会很感激你的。

- (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，我通过传递调用以下函数：

-(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];
}

提前致谢。

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1 回答 1

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一个简单的解决方法是，如果您始终以纵向方式使用相机，请添加以下小片段：

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

如果您需要动态确定您的方向，请找出您所处的方向。

查看kCGImagePropertyOrientation

于 2012-07-19T12:06:02.020 回答