AFORGE的进一步挖掘--用摄像头驱动3D模型运动

作者：穆容

转自：http://www.cnblogs.com/yriyr/archive/2010/07/01/1769478.html

效果：在摄像头前面移动，屏幕上显示一个3D的人头，跟着你的移动转动。

原理：项目由两个程序完成，一个程序用来监控摄像头。一个用WPF实现3D模型的驱动。

　　　aforge在监控摄像头的时候，一旦有人在摄像头前面移动，移动物体周围会有一片红色。我们利用aforge的过滤和跟踪功能。发现红色位于画面的什么位置，再将位置信息通过网络传递给WPF程序。由WPF根据位置信息转动3D模型。

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主要代码：

1.摄像头监控

private void videoSourcePlayer_NewFrame(object sender,ref Bitmap image)
??????? {
??????????? nowImg = (Bitmap)image.Clone();
??????????? if (detector != null)
??????????? {
??????????????? Bitmap objectImage = colorFilter.Apply(image);
??????????????? // lock image for further processing
??????????????? BitmapData objectData = objectImage.LockBits(new Rectangle(0,image.Width,image.Height),
??????????????????? ImageLockMode.ReadOnly,image.PixelFormat);

??????????????? // grayscaling
??????????????? UnmanagedImage grayImage = grayFilter.Apply(new UnmanagedImage(objectData));

??????????????? // unlock image
??????????????? objectImage.UnlockBits(objectData);

??????????????? // locate blobs
??????????????? blobCounter1.ProcessImage(grayImage);
??????????????? Rectangle[] rects = blobCounter1.GetObjectsRectangles();
??????????????? if (rects.Length > 0)
??????????????? {
??????????????????? for (int i = 0; i < rects.Length; i++)
??????????????????? {
??????????????????????? Rectangle objectRect = rects[i];
??????????????????????? int area = 0;
??????????????????????? if (objectRect.Right > 0 && objectRect.Right < 100) area = 1;
??????????????????????? if (objectRect.Right > 100 && objectRect.Right < 200) area = 2;
??????????????????????? if (objectRect.Right > 200 && objectRect.Right < 300) area = 3;
??????????????????????? if (objectRect.Right > 300 && objectRect.Right < 400) area = 4;
??????????????????????? if (objectRect.Right > 400 && objectRect.Right < 500) area = 5;
??????????????????????? if (objectRect.Right > 500 && objectRect.Right < 600) area = 6;
??????????????????????? if (objectRect.Right > 600 && objectRect.Right < 700) area = 7;

??????????????????????? this.listBox1.Items.Insert(0,"Right -- " + area.ToString());

??????????????????????? ASCIIEncoding asen = new ASCIIEncoding();
??????????????????????? Stream stm = TCPSend.GetStream();
??????????????????????? byte[] ba = asen.GetBytes(area.ToString());
??????????????????????? stm.Write(ba,ba.Length);

??????????????????????? // draw rectangle around derected object
??????????????????????? Graphics g = Graphics.FromImage(image);

??????????????????????? using (Pen pen = new Pen(Color.FromA#a0ffa0,3))
??????????????????????? {
??????????????????????????? g.DrawRectangle(pen,objectRect);
??????????????????????? }

??????????????????????? g.Dispose();
??????????????????? }

???????????????? }?

　　　　　　...

}

2. wpf贴图问题

其实这也不算什么技术点，只不过我在这里浪费了很多时间，所以特地记录下来：

定义画刷资源

??? <Window.Resources>
?? ??? ?<ImageBrush x:Key="ImageBrush1" ImageSource="D:c#项目wxd_wpf_3dtestWpfApplication1WpfApplication1157860.jpg"/>
?? ??? ?<ImageBrush x:Key="ImageBrush_body" ImageSource="D:c#项目wxd_wpf_3dtestWpfApplication1WpfApplication1body.jpg"/>
?? ??? ?<ImageBrush x:Key="ImageBrush_face" ImageSource="D:c#项目wxd_wpf_3dtestWpfApplication1WpfApplication1face.jpg"/>
?? ??? ?<ImageBrush x:Key="ImageBrush_eye" ImageSource="D:c#项目wxd_wpf_3dtestWpfApplication1WpfApplication1eye.jpg"/>
?? ??? ?<ImageBrush x:Key="ImageBrush_fq" ImageSource="D:c#项目wxd_wpf_3dtestWpfApplication1WpfApplication1fq.jpg"/>
?? ??? ?<ImageBrush x:Key="ImageBrush_hair" ImageSource="hair.jpg"/>
?? ?</Window.Resources>

使用画刷：

<GeometryModel3D.Material>
?? ??? <DiffuseMaterial Brush="{DynamicResource ImageBrush_fq}"/>
</GeometryModel3D.Material>?

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3.3D旋转

前台：

?? ??? ??? ??? ???? <ModelVisual3D x:Name="____">
??????????????????????? <ModelVisual3D.Transform>
??????????????????????? <Transform3DGroup>
?????????????????????????? ?
??????????????????????????? <RotateTransform3D >
??????????????????????????????? <RotateTransform3D.Rotation>
??????????????????????????????????? <AxisAngleRotation3D Axis="0,1,0" x:Name="body"></AxisAngleRotation3D> //定义旋转器
??????????????????????????????? </RotateTransform3D.Rotation>
??????????????????????????? </RotateTransform3D>
??????????????????????? </Transform3DGroup>
??????????????????????? </ModelVisual3D.Transform>?

?后台：

this.body.Angle += i/2;

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4.跨线程访问

用一个新的线程来监控网络端口，有位置数据上来之后，通知主线程来旋转3D模型

??????? void update(int i) ??????? { ??????????? this.Dispatcher.Invoke(DispatcherPriority.Normal,(ThreadStart)delegate ??????????? { ??????????????? this.body.Angle += i/2; ??????????? }); ???????? ??????? }?