iphone - iOS 6 人脸检测不起作用

Question

我使用以下代码来检测IOS 5的人脸

CIImage  *cIImage = [CIImage imageWithCGImage:image.CGImage];
            CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey:CIDetectorAccuracy]];
            NSArray *features = nil;
            features = [detector featuresInImage:cIImage];
            if ([features count] == 0) 
            {
                NSDictionary* imageOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:6] forKey:CIDetectorImageOrientation];
                features = [detector featuresInImage:cIImage options:imageOptions];
            }

使用此代码，我能够在 IOS 5 中检测人脸，但最近我们已将系统升级到 Xcode 4.4 和 IOS 6，现在，人脸检测无法正常工作，

在 IOS 6 中检测人脸需要进行哪些更改。

非常感谢任何形式的帮助

Answer 1

我注意到 iOS6 中的人脸检测不如 iOS5 中的好。尝试选择一些图像。您可能会发现它在 iOS6 中对很多图像(但不是全部)都可以正常工作。

我一直在测试同一组图像:1.运行iOS6的模拟器。2.iPhone 5(iOS6)3.iPhone 3GS(iOS5)。

3GS 比其他两个选项检测到更多的面孔。

这是代码，它适用于两者，但在 iOS6 上效果不佳:

- (void)analyseFaces:(UIImage *)facePicture {
// Create CI image of the face picture
CIImage* image = [CIImage imageWithCGImage:facePicture.CGImage];

// Create face detector with high accuracy
CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeFace
                                          context:nil options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey:CIDetectorAccuracy]];

// Create array of detected faces
NSArray* features = [detector featuresInImage:image];

// Read through the faces and add each face image to facesFound mutable
for(CIFaceFeature* faceFeature in features)
{
    CGSize parentSize = facePicture.size;

    CGRect origRect = faceFeature.bounds;
    CGRect flipRect = origRect;
    flipRect.origin.y = parentSize.height - (origRect.origin.y + origRect.size.height);

    CGImageRef imageRef = CGImageCreateWithImageInRect([facePicture CGImage], flipRect);
    UIImage *faceImage = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);

    if (faceImage)
        [facesFound addObject:faceImage];
}