server-ocr-1.scala

object Main extends App with OCR {
  implicit val system: ActorSystem = ActorSystem("ocr")
  implicit val executor: ExecutionContextExecutor = system.dispatcher
  implicit val materializer: ActorMaterializer = ActorMaterializer()
  implicit val jsonStreamingSupport = EntityStreamingSupport.json()
  import MyJsonProtocol._
  
  def imageDeSkew:Flow[BufferedImage] = ???
  def imageToBinaryImage:Flow[BufferedImage] = ???
  def bufferedImageToMat:Flow[BufferedImage] = ???
  def matToBufferedImage:Flow[Mat] = ???
  def enhanceMat:Flow[Mat] = ???
  def imageOcr:Flow[BufferedImage] = ???
  def imageWriter:Flow[BufferedImage] = ???
  
  val route =
    path("image" / "process") {
      post {
        fileUpload("fileUpload") {
          case (fileInfo, fileStream) =>
            println(fileInfo)
            val inputStream = fileStream.runWith(StreamConverters.asInputStream())
            val image: BufferedImage = ImageIO.read(inputStream)
            // Process BufferedImage
            complete("OK")
        }
      }
    }
  
  Http().bindAndHandle(route, "localhost", 8080)
}

object MyJsonProtocol
  extends SprayJsonSupport
    with DefaultJsonProtocol {
  //...
}