我在AVMediaTypeVideo类型的Capture-Session中分析实时图像。如何在特定事件=
处捕获高质量静止图像(不是低分辨率样本缓冲区)var videoCaptureDevice: AVCaptureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
var device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
var previewLayer: AVCaptureVideoPreviewLayer?
var captureSession = AVCaptureSession()
let cameraOutput = AVCapturePhotoOutput()
//called in view did load
private func setupCamera() {
let input = try? AVCaptureDeviceInput(device: videoCaptureDevice)
captureSession.sessionPreset = AVCaptureSessionPreset640x480
if self.captureSession.canAddInput(input) {
self.captureSession.addInput(input)
}
self.previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
let videoDataOutput = AVCaptureVideoDataOutput()
if self.captureSession.canAddOutput(videoDataOutput){
self.captureSession.addOutput(videoDataOutput)
videoDataOutput.setSampleBufferDelegate(self, queue: DispatchQueue.main)
}
}
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {
// sampleBuffer is analysed
// if result is positive, I would like to take a high quality picture
}
答案 0 :(得分:0)
这是我在我的应用中使用的一小段代码。我希望这会有所帮助
recfile = open('/home/pi/Desktop/Recipt.txt', "a")
barfile = open('/home/pi/Desktop/Barcodes.txt').read()
if barcode in barfile:
print("Your product has been found. ")
while barcode in barfile:
amount = input("How many do you want? ")
print(barfile)
else:
print("Your product was not found on our systems. ")
如果您未设置 captureSession 变量的sessionPreset属性,则默认情况下其值为private func takePhoto() -> Void
{
if let videoConnection = stillImageOutput!.connection(withMediaType: AVMediaTypeVideo)
{
videoConnection.videoOrientation = AVCaptureVideoOrientation.portrait
stillImageOutput?.captureStillImageAsynchronously(from: videoConnection, completionHandler: { (sampleBuffer, error) in
guard let buffer = sampleBuffer else
{
return
}
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
let dataProvider = CGDataProvider(data: imageData as! CFData)
let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!,
decode: nil,
shouldInterpolate: true,
intent: CGColorRenderingIntent.defaultIntent)
// The image taked
let image: UIImage = UIImage(cgImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.right)
// Detenemos la captura de imagenes
self.captureSession!.stopRunning()
})
}
}
。唯一高于此值的预设为AVCaptureSessionPresetHigh