June 2018 Update

Task/Median-filter/Julia/median-filter.julia

@@ -0,0 +1,7 @@
+using Images, ImageFiltering, FileIO
+Base.isless(a::RGB{T}, b::RGB{T}) where T =
+    red(a) < red(b) || green(a) < green(b) || blue(a) < blue(b)
+Base.middle(x::RGB) = x
+
+img = load("data/lenna100.jpg")
+mapwindow(median!, img, (3, 3))

Task/Median-filter/Kotlin/median-filter.kotlin

@@ -0,0 +1,57 @@
+// Version 1.2.41
+import java.awt.Color
+import java.awt.Graphics
+import java.awt.image.BufferedImage
+import java.io.File
+import javax.imageio.ImageIO
+
+class BasicBitmapStorage(width: Int, height: Int) {
+    val image = BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR)
+
+    fun fill(c: Color) {
+        val g = image.graphics
+        g.color = c
+        g.fillRect(0, 0, image.width, image.height)
+    }
+
+    fun setPixel(x: Int, y: Int, c: Color) = image.setRGB(x, y, c.getRGB())
+
+    fun getPixel(x: Int, y: Int) = Color(image.getRGB(x, y))
+
+    fun medianFilter(windowWidth: Int, windowHeight: Int) {
+        val window = Array(windowWidth * windowHeight) { Color.black }
+        val edgeX = windowWidth / 2
+        val edgeY = windowHeight / 2
+        val compareByLuminance = {
+            c: Color -> 0.2126 * c.red + 0.7152 * c.green + 0.0722 * c.blue
+        }
+        for (x in edgeX until image.width - edgeX) {
+            for (y in edgeY until image.height - edgeY) {
+                var i = 0
+                for (fx in 0 until windowWidth) {
+                    for (fy in 0 until windowHeight) {
+                        window[i] = getPixel(x + fx - edgeX, y + fy - edgeY)
+                        i++
+                    }
+                }
+                window.sortBy(compareByLuminance)
+                setPixel(x, y, window[windowWidth * windowHeight / 2])
+            }
+        }
+    }
+}
+
+fun main(args: Array<String>) {
+    val img = ImageIO.read(File("Medianfilterp.png"))
+    val bbs = BasicBitmapStorage(img.width / 2, img.height)
+    with (bbs) {
+        for (y in 0 until img.height) {
+            for (x in 0 until img.width / 2) {
+                setPixel(x, y, Color(img.getRGB(x, y)))
+            }
+        }
+        medianFilter(3, 3)
+        val mfFile = File("Medianfilterp2.png")
+        ImageIO.write(image, "png", mfFile)
+    }
+}