Object Detection Example: Changed URL to Pretrained Model (#154)

The URL of the pre-trained model was changed recently, so I updated it in the example as well and moved to the configuration file.

Author: Dorokhov

Examples/ExampleObjectDetection/App.config

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
-    <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1"/>
-    </startup>
+  <appSettings>
+    <add key="DefaultModelUrl" value="http://download.tensorflow.org/models/object_detection/faster_rcnn_inception_resnet_v2_atrous_coco_11_06_2017.tar.gz"/>
+    <add key="DefaultTextsUrl" value="https://raw.githubusercontent.com/tensorflow/models/master/research/object_detection/data/mscoco_label_map.pbtxt"/>
+  </appSettings>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1"/>
+  </startup>
 </configuration>

Examples/ExampleObjectDetection/ExampleObjectDetection.csproj

@@ -40,6 +40,7 @@
       <HintPath>..\..\packages\Mono.Options.5.3.0.1\lib\net4-client\Mono.Options.dll</HintPath>
     </Reference>
     <Reference Include="System" />
+    <Reference Include="System.Configuration" />
     <Reference Include="System.Core" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.IO.Compression" />

Examples/ExampleObjectDetection/Program.cs

@@ -2,13 +2,12 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Configuration;
 using TensorFlow;
 using ExampleCommon;
 using Mono.Options;
-using System.IO.Compression;
 using System.Reflection;
 using System.Net;
-using ICSharpCode.SharpZipLib.Zip;
 using ICSharpCode.SharpZipLib.Tar;
 using ICSharpCode.SharpZipLib.GZip;
 
@@ -94,7 +93,7 @@ static void Main (string [] args)
 
 		private static string DownloadDefaultModel (string dir)
 		{
-			const string defaultModelUrl = "http://download.tensorflow.org/models/object_detection/faster_rcnn_inception_resnet_v2_atrous_coco_11_06_2017.tar.gz";
+			string defaultModelUrl = ConfigurationManager.AppSettings["DefaultModelUrl"] ?? throw new ConfigurationErrorsException("'DefaultModelUrl' setting is missing in the configuration file");
 
 			var modelFile = Path.Combine (dir, "faster_rcnn_inception_resnet_v2_atrous_coco_11_06_2017/frozen_inference_graph.pb");
 			var zipfile = Path.Combine (dir, "faster_rcnn_inception_resnet_v2_atrous_coco_11_06_2017.tar.gz");
@@ -124,7 +123,7 @@ private static void ExtractToDirectory (string file, string targetDir)
 
 		private static string DownloadDefaultTexts (string dir)
 		{
-			const string defaultTextsUrl = "https://raw.githubusercontent.com/tensorflow/models/master/object_detection/data/mscoco_label_map.pbtxt";
+			string defaultTextsUrl = ConfigurationManager.AppSettings ["DefaultTextsUrl"] ?? throw new ConfigurationErrorsException ("'DefaultTextsUrl' setting is missing in the configuration file");
 			var textsFile = Path.Combine (dir, "mscoco_label_map.pbtxt");
 			var wc = new WebClient ();
 			wc.DownloadFile (defaultTextsUrl, textsFile);