我创建了两个应用程序:一个用于Mac,一个用于iPhone。iPhone使用MultipeerConnectivity框架将捕获的视频帧发送到mac。我设法找到了使用以下代码将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)
CVPixelBufferLockBaseAddress(imageBuffer!, kCVPixelBufferLock_ReadOnly)
let baseAddress = CVPixelBufferGetBaseAddress(imageBuffer!)
let bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer!)
let width = CVPixelBufferGetWidth(imageBuffer!)
let height = CVPixelBufferGetHeight(imageBuffer!)
CVPixelBufferUnlockBaseAddress(imageBuffer!, 0)
let colorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedLast.rawValue)
let context = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, bitmapInfo.rawValue)
let quarzImage = CGBitmapContextCreateImage(context)
let image = UIImage(CGImage: quarzImage!)
let grayImage = convertToGrayScale(image)
let data: NSData = UIImagePNGRepresentation(grayImage)!
delegate?.recievedOutput(data)
}
委托方法只是使用session.sendData()发送数据
因此,这里涉及Mac方面。当mac收到NSData时,我使用以下代码创建了一个NSImage并创建了一个.png图像文件:
func session(session: MCSession, didReceiveData data: NSData, fromPeer peerID: MCPeerID) {
let image: NSImage = NSImage(data: data)!.imageRotatedByDegreess(270)
let cgRef = image.CGImageForProposedRect(nil, context: nil, hints: nil)
let representation = NSBitmapImageRep(CGImage: cgRef!)
let pngData = representation.representationUsingType(NSBitmapImageFileType.NSPNGFileType, properties: [NSImageCompressionFactor: 1.0])
pngData?.writeToFile("/Users/JunhongXu/Desktop/image/\(result.description).png", atomically: true)
result[4]++
self.delegate?.presentRecievedImage(image)
}
尽管图像如下图所示,但是当我检查图像文件属性时,它是RGB格式。如何将NSImage的ColorSpace更改为灰度而不是RGB?
我找到了解决问题的简单方法。由于它在传输到Mac时已经是灰度的,因此我可以使用下面的代码将图像表示的ColorSpace转换为灰度并将其另存为.png文件:
let newRep = representation.bitmapImageRepByConvertingToColorSpace(NSColorSpace.genericGrayColorSpace(), renderingIntent: NSColorRenderingIntent.Default)
let pngData = newRep!.representationUsingType(NSBitmapImageFileType.NSPNGFileType, properties: [NSImageCompressionFactor: 1.0])
pngData?.writeToFile("/Users/JunhongXu/Desktop/image/\(result.description).png", atomically: true)
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