task 4.1

src/imagefilters/ImageFilters.scala

@@ -4,18 +4,33 @@ package imagefilters
  * This class implements the various image filters
  */
 object ImageFilters {
-  def filter(src: Array[Array[Int]], func: (Int, Int, Int) => Int): Array[Array[Int]] = {
+
+  def filter(src: Array[Array[Int]], func: (Int, Int, Int, Int, Int) => Int): Array[Array[Int]] = {
     val height: Int = src.length
     val width: Int = if (height == 0) 0 else src(0).length
     val dst: Array[Array[Int]] = Array.ofDim(height, width)
     for (y: Int <- 0 until height) {
       for (x: Int <- 0 until width) {
-        dst(y)(x) = func(src(y)(x), x, y)
+        dst(y)(x) = func(src(y)(x), x, y, width, height)
       }
     }
     return dst
   }
+  def filter(src: Array[Array[Int]], func: (Int, Int, Int) => Int): Array[Array[Int]] = filter(src, (value, x, y, width, height) => func(value, x, y))
+  def filter(src: Array[Array[Int]], func: (Int) => Int): Array[Array[Int]] = filter(src, (value, x, y, width, height) => func(value))
 
-  def duplicate(a: Array[Array[Int]]): Array[Array[Int]] = filter(a, (value, x, y) => value)
-  def threshold(a: Array[Array[Int]], thresh: Int): Array[Array[Int]] = filter(a, (value, x, y) => if (value > thresh) 255 else 0)
+  def duplicate(a: Array[Array[Int]]): Array[Array[Int]] = filter(a, (value) => value)
+  def threshold(a: Array[Array[Int]], thresh: Int): Array[Array[Int]] = filter(a, (value) => if (value > thresh) 255 else 0)
+  def mean(a: Array[Array[Int]]): Array[Array[Int]] = filter(a, (value: Int, x, y, width, height) => {
+    if (x == 0 || x == width - 1 || y == 0 || y == height - 1) value
+    else {
+      var avg: Double = 0
+      for (dy: Int <- -1 to 1) {
+        for (dx: Int <- -1 to 1) {
+          avg += a(y+dy)(x+dx)
+        }
+      }
+      (avg/9.0).toInt
+    }
+  })
 }

src/imagefilters/ImageProcessingApp.scala

@@ -14,4 +14,7 @@ object ImageProcessingApp extends App {
 	dest.setPixelsBW(newPixels)
 
 	thresh.setPixelsBW(ImageFilters.threshold(newPixels, 128))
+
+	val mean = new ImageGraphics("./res/imageProcessing.jpg", "Mean", 0, 250)
+	mean.setPixelsBW(ImageFilters.mean(mean.getPixelsBW()))
 }