C#图像处理的多种方法_c#

本文实例为大家分享了c#图像处理的具体代码，供大家参考，具体内容如下

（1）在form1窗体中的picturebox1控件中显示通过openfiledialog指定的图像文件内容。

将sizemode设置成stretchimage

private void 打开toolstripmenuitem_click(object sender, eventargs e)
    {
      openfiledialog open = new openfiledialog();
      open.filter = "所有文件|*.*";
      if (open.showdialog() == dialogresult.ok)
      {
        bitmap im = new bitmap(open.filename);
        picturebox1.image = im;
        //picturebox1.sizemode = pictureboxsizemode.stretchimage;
      }
    }

（2）编制一个图像格式转换的应用程序，实现bmp图像与jpeg图像的格式转换。

private void bmptoolstripmenuitem_click(object sender, eventargs e)
    {
      bitmap box = new bitmap(picturebox1.image);
      savefiledialog sv1 = new savefiledialog();
      sv1.filter = "bmp|*.bmp";
      sv1.showdialog();
      string str = sv1.filename;
      box.save(str, system.drawing.imaging.imageformat.bmp);
    }
 
private void jpegtoolstripmenuitem_click(object sender, eventargs e)
    {
      bitmap box = new bitmap(picturebox1.image);
      savefiledialog sv1 = new savefiledialog();
      sv1.filter = "jpeg文件|*.jpeg";
      sv1.showdialog();
      string str = sv1.filename;
      box.save(str, system.drawing.imaging.imageformat.jpeg);
    }

（3）在窗体中添加两个picturebox，然后利用openfiledialog控件选择一彩色图像文件并在picturebox1中加载，然后将这一彩色图像转换为灰度图像，并在picturebox2中进行显示，将此图像保存为a.bmp。

private void 灰度toolstripmenuitem_click(object sender, eventargs e)
    {
      picturebox2.sizemode = pictureboxsizemode.stretchimage;
      color c = new color();
      bitmap b1 = new bitmap(picturebox1.image);
      int rr, gg, bb, cc;
      for (int i = 0; i < picturebox1.image.width; i++) 
      {
        for (int j = 0; j < picturebox1.image.height; j++)
        {
          c = b1.getpixel(i, j);
          rr = c.r;
          gg = c.g;
          bb = c.b;
          cc = (int)((rr + gg + bb) / 3);
          if (cc < 0) cc = 0;
          if (cc > 255) cc = 255;
          color nc = color.fromargb(cc, cc, cc);
          b1.setpixel(i, j, nc);
        }
      }
      picturebox2.refresh();
      picturebox2.image = b1;
    }
private void 灰度图像存储toolstripmenuitem_click(object sender, eventargs e)
    {
 
      if (picturebox2.image != null)
      {
        bitmap box = new bitmap(picturebox2.image);
        savefiledialog sv1 = new savefiledialog();
        sv1.filter = "bmp文件|*.bmp";
        sv1.showdialog();
        string str = sv1.filename;
        box.save(str, system.drawing.imaging.imageformat.bmp);
        //picturebox2.sizemode = pictureboxsizemode.stretchimage;
      }
      else messagebox.show("没有生成灰度图像");
    }

（4）将（3）中制作的a.bmp图像加载到picturebox1，把a.bmp转换为二值图像，并在picturebox2中进行显示。

private void 转化toolstripmenuitem_click(object sender, eventargs e)
    {
      //bitmap m = new bitmap(picturebox1.width, picturebox1.height);
      bitmap map=new bitmap(picturebox1.image);
      color c;
      for (int i = 0; i < map.height; i++)
      {
        for (int j = 0; j < map.width; j++)
        {
          c = map.getpixel(j, i);
          if (c.r > 100) c = color.fromargb(255, 255, 255); //红色分量值大于100则设成白色
          else c = color.black;
          map.setpixel(j, i, c);
        }
      }
      picturebox2.image = map;
      picturebox2.sizemode = pictureboxsizemode.stretchimage;
    }

（5）建立对比度增强算法，并对a.bmp图像进行对比度增强，显示在picturebox2中显示出来,与picturebox1中的a.bmp图像进行比较。

private void 对比toolstripmenuitem_click(object sender, eventargs e)
    { 
      color c = new color();
      bitmap box1 = new bitmap(picturebox1.image);
      int lev=30, wid=170;
      int[] map = new int[256];
      for(int i=0;i<=lev;i++)
      {
        map[i]=0;
      }
      for (int i=lev;i<=wid;i++) //对比度增强
      {
        map[i] = (int)((i * 1.0 - lev) / wid * 255);
      }
      for (int i = lev + wid; i < 256; i++)
      {
        map[i] = 255;
      }
      int gray;
      for (int i = 0; i < box1.width; i++)
      {
        for (int j = 0; j < box1.height; j++)
        {
          c = box1.getpixel(i, j);
          gray = c.r;
          c = color.fromargb(map[gray], map[gray], map[gray]);
          box1.setpixel(i, j, c);
        }
      }
      picturebox2.image = box1;
      picturebox2.sizemode = pictureboxsizemode.stretchimage;
 }

灰度图像：