opencv多线程处理数据

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单线程处理数据，需要阻塞等待处理完一张图片才开始处理下一张图片。

这里想用多线程的思路来处理。

需要注意的是，imshow只能在主线程里面调用，具体原因还未查清楚～～

下面是代码：

#include <opencv2/core/core.hpp>#include <opencv2/highgui/highgui.hpp>#include <opencv2/imgproc/imgproc.hpp>#include <boost/thread.hpp>#include <boost/thread/mutex.hpp> #include <iostream>#include <queue>  boost::mutex io_mutex;  using namespace cv; using namespace std;Mat image_catch;volatile bool thread_all_exit = false;Mat display_mat_origin;Mat display_mat_process;void catch_image(){  Mat frame;   VideoCapture capture(0);  if(!capture.isOpened()){        boost::mutex::scoped_lock lock(io_mutex);           cout<<"fail to open!"<<endl;        thread_all_exit = true;          return;  }      while(1){        capture.read(frame);        if (frame.empty())        {              capture.release();              thread_all_exit = true;                     break;        }           resize(frame,frame,Size(640,480),0,0,CV_INTER_LINEAR);        boost::mutex::scoped_lock lock(io_mutex);        image_catch=frame.clone();        display_mat_origin =frame.clone();        if(thread_all_exit){          capture.release();             break;        }      }     capture.release();   }void process_image()  {      Mat img;      while (1){        if (!image_catch.empty())        {             boost::mutex::scoped_lock lock(io_mutex);          img = image_catch.clone();          resize(img,img,Size(320,240),0,0,CV_INTER_LINEAR);          display_mat_process =img.clone();        if(thread_all_exit){              break;         }      }      }     }  int main(int argc, char* argv[])  {    boost::thread thread_catch_img(boost::bind(&catch_image));    boost::thread thread_process_img(boost::bind(&process_image));  while(1){    if (!display_mat_origin.empty())    {        boost::mutex::scoped_lock lock(io_mutex);        imshow("data",display_mat_origin);        imshow("process",display_mat_process);        if (waitKey(1)==27 || thread_all_exit)        {          thread_all_exit = true;          break;        }    }    if (!display_mat_process.empty())    {        boost::mutex::scoped_lock lock(io_mutex);        imshow("process",display_mat_process);        if (waitKey(1)==27||thread_all_exit)        {          thread_all_exit = true;          break;        }    }  }  thread_catch_img.join();    thread_process_img.join();    return 0;  }

下面是makefile文件：

CC=g++BOOSTLIB=-L/usr/local/lib \         -lboost_system  -lboost_thread-mt INC=$(shell pkg-config --cflags opencv) LIB=$(shell pkg-config --libs opencv)SRCFILE=$(wildcard *.cc)DEBUGFLG=all:        $(CC) $(SRCFILE) $(DEBUGFLG) $(INC) $(BOOSTLIB) $(LIB) -o outclean:        rm -rf out

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