Add linear outline machinery

src/main/java/services/OutlineService.java

@@ -1,4 +1,32 @@
 package services;
 
+import domain.image.Image;
+import domain.image.processing.outline.LinearOutline;
+
 public class OutlineService {
+
+    public Image prewittGradient(Image image, int direction) {
+        return LinearOutline
+                .prewittGradient(image, direction)
+                .toImage();
+    }
+
+    public Image sobelGradient(Image image, int direction) {
+        return LinearOutline
+                .sobelGradient(image, direction)
+                .toImage();
+    }
+
+    public Image laplacian4(Image image) {
+        return LinearOutline
+                .laplacian4(image)
+                .toImage();
+    }
+
+    public Image laplacian8(Image image) {
+        return LinearOutline
+                .laplacian8(image)
+                .toImage();
+    }
+
 }