优化图片旋转的问题

App_Code/CommonUse.cs

@@ -1499,7 +1499,6 @@ public class CommonUse
                     break;
             }
         }
-
         return bitmap;
     }
 

Temp/Default.aspx.cs

@@ -314,9 +314,8 @@ public partial class 外部答题卡_Default : System.Web.UI.Page
                 Response.Write("NO DATA");
                 return false;
             }
-            Bitmap PictureBoxBitMap = ImgGet(dt.Rows[0]["TempPicture64_nvarchar"].ToString());
+            Bitmap PictureBoxBitMap = UrlToImage(dt.Rows[0]["TempPicture64_nvarchar"].ToString());
 
-            //var PictureBoxBitMap = commonUse.RotateByOrientation(tempPictureBoxBitMap);
             if (PictureBoxBitMap == null)
             {
                 Response.Write("NO PICTURE");
@@ -337,7 +336,7 @@ public partial class 外部答题卡_Default : System.Web.UI.Page
 
                 Image<Bgr, byte> myImage = new Image<Bgr, byte>(PictureBoxBitMap);
                 // 进行中值滤波
-                CvInvoke.MedianBlur(myImage, myImage, 13);
+                CvInvoke.MedianBlur(myImage, myImage, 11);
                 // 进行高斯滤波
                 CvInvoke.GaussianBlur(myImage, myImage, new Size(0, 0), 3);
 
@@ -352,7 +351,7 @@ public partial class 外部答题卡_Default : System.Web.UI.Page
                 VectorOfVectorOfPoint selected_contours1 = commonUse.GetUsefulContoursDingWei(mat_dilate, 1);
 
                 //var color_mat1 = commonUse.DrawContours(mat_dilate, selected_contours1);
-                //commonUse.ShowMatWaitKey("44444", color_mat1, 0.6);
+                //commonUse.ShowMatWaitKey("44444", color_mat1, 0.8);
 
                 //Response.Write(ImgToBase64String(color_mat1.Bitmap)); 
                 //return false;
@@ -1098,6 +1097,43 @@ public partial class 外部答题卡_Default : System.Web.UI.Page
         }
     }
 
+    public static Bitmap UrlToImage(string url)
+    {
+        WebRequest imgRequest = WebRequest.Create(url);
+
+        HttpWebResponse res = null;
+        try
+        {
+            res = (HttpWebResponse)imgRequest.GetResponse();
+            imgRequest.Timeout = 50000;
+            if (res.StatusCode.ToString() == "OK")
+            {
+                var tempbitmap = new Bitmap(imgRequest.GetResponse().GetResponseStream());
+
+                 // 别删！图片和网页中的方向不一致，根据图片中的方向信息，旋转图片后识别
+                return new CommonUse().RotateByOrientation(tempbitmap);
+            }
+            else
+            {
+                return null;
+            }
+        }
+        catch (WebException ex)
+        {
+            res = (HttpWebResponse)ex.Response;
+            return null;
+        }
+        finally
+        {
+            if (res != null)
+            {
+                res.Dispose();
+                res.Close();
+            }
+            imgRequest.Abort();
+        }
+    }
+
 
 
 }

Temp/TempDraw.aspx.cs

@@ -287,7 +287,8 @@ public partial class Temp_TempDraw : System.Web.UI.Page
             imgRequest.Timeout = 50000;
             if (res.StatusCode.ToString() == "OK")
             {
-                return new Bitmap(imgRequest.GetResponse().GetResponseStream());
+                var tempbitmap = new Bitmap(imgRequest.GetResponse().GetResponseStream());
+                return new CommonUse().RotateByOrientation(tempbitmap);
             }
             else
             {

Temp/UserTemp.aspx.cs

@@ -149,7 +149,8 @@ public partial class Temp_UserTemp : System.Web.UI.Page
                 Response.Write("NODATA");
                 return;
             }
-            Bitmap PictureBoxBitMap = ImgGet(dt.Rows[0]["TempPicture64_nvarchar"].ToString());
+            Bitmap temp = ImgGet(dt.Rows[0]["TempPicture64_nvarchar"].ToString()); 
+            var PictureBoxBitMap = new CommonUse().RotateByOrientation(temp);
             if (PictureBoxBitMap == null)
             {
                 Response.Write("NOPICTURE");