2つの画像a,bがあり、画像bが画像aのどの位置に含まれるかを調べるコード

gistfile1.scala

def point(a: BufferedImage, b: BufferedImage) =
  for {
    points <- (for {
      ax <- 0.to(a.getWidth - b.getWidth).view
      ay <- 0.to(a.getHeight - b.getHeight).view
    } yield {
      for {
        bx <- 0.until(b.getWidth).view
        by <- 0.until(b.getHeight).view
      } yield (ax, ay) -> (bx, by)
    }).find(_ forall {
      case ((ax, ay), (bx, by)) =>
        a.getRGB(ax + bx, ay + by) == b.getRGB(bx, by)
    })
    ((x, y), _) <- points.headOption
  } yield (x + b.getWidth / 2, y + b.getHeight / 2)