bi-mat.scala

def bufferedImageToMat = Flow[BufferedImage].map(bi => {
  val mat = new Mat(bi.getHeight, bi.getWidth, CV_8UC(3))
  val indexer:UByteRawIndexer = mat.createIndexer()
  for (y <- 0 until bi.getHeight()) {
    for (x <- 0 until bi.getWidth()) {
      val rgb = bi.getRGB(x, y)
      indexer.put(y, x, 0, (rgb >> 0) & 0xFF)
      indexer.put(y, x, 1, (rgb >> 8) & 0xFF)
      indexer.put(y, x, 2, (rgb >> 16) & 0xFF)
    }
  }
  indexer.release()
  mat
})

def matToBufferedImage = Flow[Mat].map(mat => {
  Java2DFrameUtils.toBufferedImage(mat)
})