天天向上

今天來複習一下執行緒, 先前有一些觀念錯誤: 關於暫停/關閉執行緒Suspend, Terminate不該踩到地雷, 我一個都沒錯過@@ 1. 本範例示範如何開一個worker執行緒, 呼叫Start開始不斷執行Job內容, 且不影響原本的主執行緒2. 要暫停一個執行緒不建議使用Thread.Suspend,  這會讓你不曉得在你呼叫Suspend    當下該執行緒在幹甚麼;更準確地說, 你會不曉得worker在Job中已經    完成多少(停在Job中的哪個階段)3. 不要使用Terminate, 建議使用Join3. 透過ManualResetEvent搭配WaitOne 方法, 可以讓你更精準控制: 暫停, 繼續, 以及停止執行緒

安裝64位元版本的VTK for .NET
C:\Program Files\ActiViz.NET 5.8.0 OpenSource Edition

include目錄設定C:\VTK 5.6\VTK\Views;C:\VTK 5.6\VTK\Charts;C:\VTK 5.6\VTK\Widgets;C:\VTK 5.6\VTK\Rendering;C:\VTK 5.6\VTK\IO;C:\VTK 5.6\VTK\Imaging;C:\VTK 5.6\VTK\Graphics;C:\VTK 5.6\VTK\Geovis;C:\VTK 5.6\VTK\GenericFiltering;C:\VTK 5.6\VTK\Filtering;C:\VTK 5.6\VTK\Common;C:\VTK 5.6\release加入下列函式庫vtkCharts.lib
vtkViews.lib
vtkWidgets.lib
vtkHybrid.lib
vtkRendering.lib
vtkGraphics.lib
vtkImaging.lib
vtkIO.lib
vtkFiltering.lib
vtkCommon.lib
vtksys.lib

將C:\VTK 5.6\vtkdata\Data\42400-IDGH.stl加入專案

 1: // ReadSTLEx.cpp : 定義主控台應用程式的進入點。

 2: //

 3:  

 4: #include "stdafx.h"

 5: #include <vtkPolyData.h>

 6: #include <vtkSTLReader.h>

 7: #include <vtkSmartPointer.h>

 8: #include <vtkPolyDataMapper.h>

 9: #include <vtkActor.h>

 10: #include <vtkRenderWindow.h>

 11: #include <vtkRenderer.h>

 12: #include <vtkRenderWindowInteractor.h>

 13: int _tmain(int argc, _TCHAR* argv[])

 14: {

 15: std::string inputFilename = "42400-IDGH.stl";

 16: 

 17: vtkSmartPointer<vtkSTLReader> reader = vtkSmartPointer<vtkSTLReader>::New();

 18: reader->SetFileName(inputFilename.c_str());

 19: reader->Update();

 20: 

 21: // Visualize

 22: vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();

 23: mapper->SetInputConnection(reader->GetOutputPort());

 24: 

 25: vtkSmartPointer<vtkActor> actor =

 26: vtkSmartPointer<vtkActor>::New();

 27: actor->SetMapper(mapper);

 28: 

 29: vtkSmartPointer<vtkRenderer> renderer =

 30: vtkSmartPointer<vtkRenderer>::New();

 31: vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();

 32: renderWindow->AddRenderer(renderer);

 33: vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();

 34: renderWindowInteractor->SetRenderWindow(renderWindow);

 35: 

 36: renderer->AddActor(actor);

 37: renderer->SetBackground(.0, .0, .6); // Background color green

 38: 

 39: renderWindow->Render();

 40: renderWindowInteractor->Start();

 41: return 0;

 42: }

 43:  

 1: renWin->SetSize(300, 200);

C:\VTK 5.6\VTK\Widgets;C:\VTK 5.6\VTK\Rendering;C:\VTK 5.6\VTK\IO;C:\VTK 5.6\VTK\Imaging;C:\VTK 5.6\VTK\Graphics;C:\VTK 5.6\VTK\Geovis;C:\VTK 5.6\VTK\GenericFiltering;C:\VTK 5.6\VTK\Filtering;C:\VTK 5.6\VTK\Common;C:\VTK 5.6\release;C:\VTK 5.6\libvtkWidgets.lib
vtkHybrid.lib
vtkRendering.lib
vtkGraphics.lib
vtkImaging.lib
vtkIO.lib
vtkFiltering.lib
vtkCommon.lib
vtksys.lib

在進行影像處理工作時, 經常需要批次處理, 處理的對象可能是某個目錄夾下的一序列影像 {0.bmp, 1.bmp, 2.bmp,….},可以存放在一個List<string>的容器內, 紀錄該目錄夾特定附檔名的檔案名稱

 1: public static List<string> searchFileNames(string sDirPath, string fileExtension)

 2: {

 3: List<string> list = new List<string>();

 4: if (!Directory.Exists(sDirPath)) return null;

 5: foreach (string filePath in System.IO.Directory.GetFiles(sDirPath, fileExtension))

 6: {

 7: list.Add(System.IO.Path.GetFileName(filePath));

 8: }

 9: return list;

 10: }

之前有寫過一篇關於如何將執行緒運算結果顯示於人機介面上?, 今天剛好找到一個不錯的範例How to: Make Thread-Safe Calls to Windows Forms Controls, Let’s cut to the chase and get started!======================================================================Access to Windows Forms controls is not inherently thread safe. If you have two or more threads manipulating the state of a control, it is possible to force the control into an inconsistent state. Other thread-related bugs are possible as well, including race conditions and deadlocks. It is important to ensure that access to your controls is done in a thread-safe way.更新控制元件與threrad safe觀念: 如果有兩個執行緒, 一個UI(主執行緒), 另一個或更多個使用者開的執行緒要更新控制元件上(windows Form, TextBox, Label,…), 有可能造成不相容狀況

載入一張照片, 利用 InRange參數lower和higher顏色BGR上下限篩選感興趣區域, 得到一張遮罩m_img_inRange,再利用CvBlobDetector 進行Blob運算

 1: using Emgu.CV;

 2: using Emgu.CV.Cvb;

 3: using Emgu.CV.CvEnum;

 4: using Emgu.CV.Structure;

 5: using Emgu.CV.VideoSurveillance;

 6: using System.Diagnostics;

 7: using System.Threading;

 8:  

 9: private void CalInRange()

 10: {

 11: if (m_img_color == null) return;

 12: m_img_inRange = m_img_color.InRange(lower, higher);

 13: m_img_inRange_not = m_img_inRange.Not();

 14: using (CvBlobs blobs = new CvBlobs())

 15: {

 16: m_blobDetector.Detect(m_img_inRange, blobs);

 17: m_img_color_copy = m_img_color.Copy();

 18: foreach (var pair in blobs)

 19: {

 20: CvBlob b = pair.Value;

 21: CvInvoke.Rectangle(m_img_color_copy, b.BoundingBox, new MCvScalar(255.255, 255, 0), 5);

 22: //CvInvoke.PutText(frame, blob.ID.ToString(), Point.Round(blob.Center), FontFace.HersheyPlain, 1.0, new MCvScalar(255.0, 255.0, 255.0));

 23: }

 24:  

 25: imageBox1.Image = m_img_color_copy;

 26: imageBox2.Image = m_img_inRange;

 27: imageBox3.Image = m_img_inRange_not;

 28: }

 29: }

1. 利用Canny Method 直線偵測2. 利用Hough Transform(霍夫轉換)來找線段候選人3. 利用 GetExteriorAngleDegree 計算目前線段(line)與自訂義水平線(otherline)的夾角

 1: private void CalExteriorAngles()

 2: {

 3: LineSegment2D[] lines = CvInvoke.HoughLinesP(

 4: m_img_thresh_gauss.Canny(100, 64),

 5: 1, //Distance resolution in pixel-related units

 6: Math.PI / 360.0, //Angle resolution measured in radians.

 7: 90, //threshold

 8: 140, //min Line width

 9: 120); //gap between lines

 10:  

 11: 

 12: Color[] colorArray = new Color[13] { Color.Red, Color.Green, Color.Blue, Color.Honeydew, Color.AliceBlue, 

 13: Color.AliceBlue, Color.Pink, Color.Indigo, Color.IndianRed, Color.GreenYellow,

 14: Color.Lavender, Color.LemonChiffon, Color.LightBlue};

 15: Random r = new Random();

 16: int ind;

 17: //double ramp;

 18: double theta = -1;

 19: int cnt = 0;

 20: m_img_copy = m_img_color.Copy();

 21: imageBox11.Image = m_img_copy;

 22: listBox1.Items.Clear();

 23: LineSegment2D otherline = new LineSegment2D();

 24: otherline.P1 = new Point(0, 0);

 25: otherline.P2 = new Point(m_img_gray.Width, 0);

 26: foreach (LineSegment2D line in lines)

 27: {

 28: ind = r.Next() % 11 +1;

 29: theta = line.GetExteriorAngleDegree(otherline);

 30:  

 31:  

 32: //this.Text = theta.ToString();

 33: //if (theta > 0)

 34: {

 35: m_img_copy.Draw(line, new Bgr(colorArray[ind]), 12);

 36: imageBox11.Image = m_img_copy;

 37: cnt++;

 38: listBox1.Items.Add(string.Format("#{0} Angle = {1:###.##}",cnt, theta));

 39: //imageBox11.Image = m_img_copy;

 40: Application.DoEvents();

 41: Thread.Sleep(2000);

 42: //if (cnt > 0) break;

 43: }

 44:  

 45: 

 46:  

 47:  

 48: }

 49: imageBox11.Image = m_img_copy;

 50: 

 51: //MessageBox.Show("Done");

 52: }