小编Jun*_* Xu的帖子

我创建了两个应用程序：一个用于 mac，一个用于 iPhone。iPhone 使用 MultipeerConnectivity 框架将它捕获的视频帧发送到 mac。我已经设法找到使用以下代码将 UIimage 转换为灰度的代码：

func convertToGrayScale(image: UIImage) -> UIImage {
        let imageRect:CGRect = CGRectMake(0, 0, image.size.width, image.size.height)
        let colorSpace = CGColorSpaceCreateDeviceGray()
        let width = image.size.width
        let height = image.size.height
        let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.None.rawValue)
        let context = CGBitmapContextCreate(nil, Int(width), Int(height), 8, 0, colorSpace, bitmapInfo.rawValue)
        CGContextDrawImage(context, imageRect, image.CGImage)
        let imageRef = CGBitmapContextCreateImage(context)
        let newImage = UIImage(CGImage: imageRef!)
        return newImage
    }

在下面的代码中，它将视频帧发送到 Mac：

func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) {
        let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) …