问用于检测人脸情绪的CoreImage CIFeature

EN

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {

    let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)
    let opaqueBuffer = Unmanaged<CVImageBuffer>.passUnretained(imageBuffer!).toOpaque()
    let pixelBuffer = Unmanaged<CVPixelBuffer>.fromOpaque(opaqueBuffer).takeUnretainedValue()
    let sourceImage = CIImage(cvPixelBuffer: pixelBuffer, options: nil)
    options = [CIDetectorSmile : true as AnyObject, CIDetectorEyeBlink: true as AnyObject, CIDetectorImageOrientation : 6 as AnyObject]

    let features = self.faceDetector!.features(in: sourceImage, options: options)

    for feature in features as! [CIFaceFeature] {

        if (feature.hasSmile) {

            DispatchQueue.main.async {
                self.updateSmileEmotion()
            }
        }    
        else {
            DispatchQueue.main.async {
                self.resetEmotionLabel()
            }
        }                     
    }

func updateSmileEmotion () {
    self.emtionLabel.text = " "
    self.emtionLabel.text = "HAPPY"
}
func resetEmotionLabel () {
    self.emtionLabel.text = " "
}