Question

我需要水平翻转我正在预览和捕捉的视频。 A-la iChat，我有一个网络摄像头，希望它看起来好像用户正在镜子里。

我正在预览QTCaptureView中的Quicktime视频。我的捕获是逐帧完成的（原因我不会进入），例如：

imageRep = [NSCIImageRep imageRepWithCIImage: [CIImage imageWithCVImageBuffer: frame]];
image = [[NSImage alloc] initWithSize: [imageRep size]];
[image addRepresentation: imageRep];
[movie addImage: image forDuration: someDuration withAttributes: someAttributes];

任何提示？

Answer 1

没有什么能像复活旧问题一样。无论如何，我来到这里，几乎找到了我想要的东西，感谢Brian Webster，但是如果有人在寻找批发解决方案，请在将您的课程设置为QTCaptureView实例的代表后尝试此操作：

- (CIImage *)view:(QTCaptureView *)view willDisplayImage:(CIImage *)image {
//mirror image across y axis
return [image imageByApplyingTransform:CGAffineTransformMakeScale(-1, 1)];
}

Answer 2

你可以通过从捕获中获取CIImage并通过Core Image过滤器来运行它来翻转图像。然后，您将生成的图像传递给图像代表而不是原始图像。代码看起来像：

CIImage* capturedImage = [CIImage imageWithCVImageBuffer:buffer];
NSAffineTransform* flipTransform = [NSAffineTransform transform];
CIFilter* flipFilter;
CIImage* flippedImage;

[flipTransform scaleByX:-1.0 y:1.0]; //horizontal flip
flipFilter = [CIImage filterWithName:@"CIAffineTransform"];
[flipFilter setValue:flipTransform forKey:@"inputTransform"];
[flipFilter setValue:capturedImage forKey:@"inputImage"];
flippedImage = [flipFilter valueForKey:@"outputImage"];
imageRep = [NSCIImageRep imageRepWithCIImage:flippedImage];
...

Answer 3

试试这个！它会将过滤器应用于CaptureView，但不会应用于输出视频。

- (IBAction)Vibrance:(id)sender
{
    CIFilter* CIVibrance = [CIFilter filterWithName:@"CIVibrance" keysAndValues:
                            @"inputAmount", [NSNumber numberWithDouble:2.0f],
                            nil];
    mCaptureView.contentFilters = [NSArray arrayWithObject:CIVibrance];
}

顺便说一句，您可以应用此参考中的任何过滤器：https://developer.apple.com/library/mac/#documentation/graphicsimaging/reference/CoreImageFilterReference/Reference/reference.html

翻转Quicktime预览＆amp;捕获

3 个答案: