scalaでフィルタ処理

ImageProc.scala

import scala.language.implicitConversions

import java.awt.image.{BufferedImage,Kernel,ConvolveOp}
import javax.imageio.ImageIO
import java.io.File

object ImageProc {
	implicit class RichString(self:String) {
		def getExt() = self drop(self.lastIndexOf(".") + 1)
	}
	implicit class RichBufferedImage(self:BufferedImage){
		def save(path:String):Boolean = ImageIO.write(self,path.getExt,new File(path))
	}
	implicit class FilterExtensitons(self:Array[Float]) {
		def createKernel() = {
			val size = math.sqrt(self.length).toInt
			new Kernel(size,size,self)
		}
		def createConvOp() = new ConvolveOp(createKernel,ConvolveOp.EDGE_NO_OP,null)
		def filter(src:BufferedImage) = {
			val dst = new BufferedImage(src.getWidth,src.getHeight,BufferedImage.TYPE_INT_RGB) 
			self.createConvOp.filter(src,dst)
		}
	}
	object ImageFilters {
		val edge_3 = Array(0.0f, -1.0f, 0.0f,-1.0f, 4.0f, -1.0f, 0.0f, -1.0f, 0.0f)
		def blur(size:Int) = {
			val length = size * size
			Array.fill(length)(1.0f / length)
		}
		val sharp_3 = Array(-1.0f, -1.0f, -1.0f, -1.0f, 9.0f, -1.0f, -1.0f, -1.0f, -1.0f)
		val enbos_3 = Array(-1.0f, 0.0f, 1.0f, -2.0f, 0.0f, 2.0f, -1.0f, 0.0f, 1.0f)
	}
	def load(file:String):BufferedImage = ImageIO.read(new File(file))
	def main(args:Array[String]):Unit = {
		val src = load("sample.png")
		ImageFilters.edge_3.filter(src).save("edge_3.jpg")
		ImageFilters.blur(5).filter(src).save("blur.jpg")
		ImageFilters.sharp_3.filter(src).save("sharp_3.jpg")
		ImageFilters.enbos_3.filter(src).save("enbos_3.jpg")
	}
}