Emgucv3.1_在WPF上的靜態影像呈現_到Live視訊處理

第一階段.先觀察   Emgucv  提供的   WPF  範例

Q1. 怎麼呈現文字跟控制視窗寬高的????

觀察功能程式區塊
  Window1.xaml.cs

http://www.emgu.com/wiki/files/3.1.0/document/html/37ada42e-a5c3-caa1-dfa7-a4a64251a059.htm



參數內容

public static void PutText(
    IInputOutputArray img,    // 欲放置文字的目標影像矩陣
    string text,              //文字內容
    Point org,                //起始左上角點座標
    FontFace fontFace,        //字體
    double fontScale,         //字大小 
    MCvScalar color,          //字的顏色
    int thickness = 1,        //字的粗細(預設為1 正常粗細)
    LineType lineType = LineType.EightConnected,
    bool bottomLeftOrigin = false
)

The Hershey fonts are a collection of vector fonts developed c. 1967 by Dr. Allen V. Hershey at the Naval Weapons Laboratory.

起始左上角點座標

字體

Emgu.CV.CvEnum.FontFace.HersheyDuplex

Duplex(英文字体)

Emgu.CV.CvEnum.FontFace.HersheyTriplex

Triplex 字體

字大小

fontscale = 1

 fontscale = 2

字的顏色

字的粗細
thickness = 1

 thickness = 2

 thickness = 3

餵進去的Mat資料型態

using   (    資源擷取   )    內嵌陳述式

BitmapSourceConverter.cs 程式區塊中

BitmapSourceConvert  類別 的  程式碼分析

//----------------------------------------------------------------------------
//  Copyright (C) 2004-2016 by EMGU Corporation. All rights reserved.       
//----------------------------------------------------------------------------

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using Emgu.CV;

namespace Emgu.CV.WPF
{
   public static class BitmapSourceConvert
   {
      /// <summary>
      /// Delete a GDI object
      /// </summary>
      /// <param name="o">The poniter to the GDI object to be deleted</param>
      /// <returns></returns>
      [DllImport("gdi32")]
      private static extern int DeleteObject(IntPtr o);

      /// <summary>
      /// Convert an IImage to a WPF BitmapSource. The result can be used in the Set Property of Image.Source
      /// </summary>
      /// <param name="image">The Emgu CV Image</param>
      /// <returns>The equivalent BitmapSource</returns>
      public static BitmapSource ToBitmapSource(IImage image)
      {
         using (System.Drawing.Bitmap source = image.Bitmap)
         {
            IntPtr ptr = source.GetHbitmap(); //obtain the Hbitmap

            BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                ptr,
                IntPtr.Zero,
                Int32Rect.Empty,
                System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

            DeleteObject(ptr); //release the HBitmap
            return bs;
         }
      }
   }
}

Q2. Image物件預設為  Fill 佔全視窗畫面

去   觀察  介面部分程式

Window1.xaml

第二階段. 試著改成開視訊

加個按鈕

開視訊畫面

程式碼:

  Window1.xaml.cs

//----------------------------------------------------------------------------
// 冠羽   
//----------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;
using System.Threading;


namespace Emgu.CV.WPF
{
   /// <summary>
   /// Interaction logic for Window1.xaml
   /// </summary>
   public partial class Window1 : Window
   {
      private Capture _capture;
      private bool _captureInProgress;
      public delegate void delUpdateImageCallback(Mat img);

      public Window1()
      {
         InitializeComponent();
      }      

      private void Button_Click(object sender, RoutedEventArgs e)
      {
          if (_capture == null)
          {
              try
              {
                  _capture = new Capture(0);
              }
              catch (NullReferenceException excpt)
              {
                  MessageBox.Show(excpt.Message);
              }
          }

          if (_capture != null)
          {
              Thread thrdWebcam = new Thread(new ThreadStart(ProcessFrame));
              _captureInProgress = true;
              thrdWebcam.Start();
          }
      }

      private void ProcessFrame()
      {
          while (_captureInProgress == true)
          {
              Mat frame = _capture.QueryFrame();

              delUpdateImageCallback dUIC = new delUpdateImageCallback(UpdateWebcamImage);
              this.Dispatcher.Invoke(dUIC, frame);
          }
      }

      private void UpdateWebcamImage(Mat img)
      {
          image1.Source = BitmapSourceConvert.ToBitmapSource(img);
      }
   }
}

Window1.xaml

<Window x:Class="Emgu.CV.WPF.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="303" Width="564">
    <Grid>
        <Image Name="image1" Stretch="Fill"  Margin="22.388,23.88,161.194,26.866" />
        <Button Content="Button" HorizontalAlignment="Left" Margin="430.328,23.88,0,0" VerticalAlignment="Top" Width="98.881" Height="38.403" Click="Button_Click"/>
    </Grid>
</Window>