Added benchmarks for detecting edges.

Former-commit-id: 5b822ad516872b035de3112840270ee3e05aa2e2
Former-commit-id: 0cd7c02e8b19ca034d519796a3cbd049c36294c1
Former-commit-id: 6b2493b3e95b7325c8d87471ae0ba749a5924b03

tests/ImageProcessorCore.Benchmarks/Samplers/DetectEdges.cs

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+// <copyright file="DetectEdges.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+
+namespace ImageProcessorCore.Benchmarks
+{
+    using System.IO;
+
+    using BenchmarkDotNet.Attributes;
+
+    using CoreImage = ImageProcessorCore.Image;
+
+    public class DetectEdges
+    {
+        private CoreImage image;
+
+        [Setup]
+        public void ReadImage()
+        {
+            if (image == null)
+            {
+                using(FileStream stream = File.OpenRead("../ImageProcessorCore.Tests/TestImages/Formats/Bmp/Car.bmp"))
+                {
+                    image = new CoreImage(stream);
+                }
+            }
+        }
+
+        [Benchmark(Description = "ImageProcessorCore DetectEdges")]
+        public void ImageProcessorCoreDetectEdges()
+        {
+            image.DetectEdges(EdgeDetection.Kayyali);
+            image.DetectEdges(EdgeDetection.Kayyali);
+            image.DetectEdges(EdgeDetection.Kirsch);
+            image.DetectEdges(EdgeDetection.Lapacian3X3);
+            image.DetectEdges(EdgeDetection.Lapacian5X5);
+            image.DetectEdges(EdgeDetection.LaplacianOfGaussian);
+            image.DetectEdges(EdgeDetection.Prewitt);
+            image.DetectEdges(EdgeDetection.RobertsCross);
+            image.DetectEdges(EdgeDetection.Robinson);
+            image.DetectEdges(EdgeDetection.Scharr);
+            image.DetectEdges(EdgeDetection.Sobel);
+        }
+    }
+}