opencv android 多线程,OpenCV多线程相机读取

我试图使用OpenCV通过单独的线程工作者从多个摄像头捕获图像 .

最终，CaptureWorker会将帧提供给工作队列进行处理，但目前我想保存图像 . 运行以下代码，但保存的“框架”已损坏且无法打开，但不是空的 .

最初，我在CaptureWorker :: startCapture()中构建和存储VideoCapture;但是，程序在打开流时崩溃了 . 在main()中构建和打开VideoCapture会打开相机并允许线程运行 .

是什么导致帧写入中断？没有报告错误 .

main.cpp中

int main(int argc, char * argv[]) {

if(argc <= 1) {

cout << "No camera arguments have been specified. Exiting." << endl;

return -1;

}

int numberOfCameras = argc - 1;

int cameraNumbers[argc-1];

for(int i=0; i

cameraNumbers[i] = atoi(argv[i+1]);

}

VideoCapture cameras[10];

pthread_t cameraThreads[numberOfCameras];

for(int i=0; i

cout << "Creating camera thread: " << i << endl;

cameras[i] = VideoCapture(i);

CaptureWorker capWorker(cameras[i], i);

pthread_create(&cameraThreads[i], NULL, &CaptureWorker::startCaptureWrap, &capWorker);

}

cout << "Closing Main" << endl;

pthread_exit(NULL);

}

CaptureWorker.cpp

class CaptureWorker {

private:

int cameraNumber;

string cameraName;

VideoCapture camera;

public:

CaptureWorker(VideoCapture camera, int cameraNumber) {

this->cameraNumber = cameraNumber;

this->camera = camera;

this->cameraName = "Camera_";

cameraName.append(to_string(cameraNumber));

cout << "CaptureWorker: Worker created" << endl;

}

void *startCapture(void) {

string imageSavePath = "Resources/images/" + this->cameraName;

mkdir(imageSavePath.c_str(), 0777);

cout << "CaptureWorker: Starting capture from camera" << endl;

int count = 0;

while(count <= 3) {

cout << "Capturing frame " << count;

Mat frame;

this->camera >> frame;

cout << " --- ";

string imageNameAndPath;

imageNameAndPath.append(imageSavePath);

imageNameAndPath.append("/img_");

imageNameAndPath.append(to_string(count).c_str());

imageNameAndPath.append(".jpg");

cout << "Saving to: " << imageNameAndPath.c_str() << endl;

imwrite(imageNameAndPath.c_str(), frame);

int c = cvWaitKey(1000);

if((char)c==27 ) {

break;

}

count++;

}

return 0;

}

static void *startCaptureWrap(void *arg) {

return ((CaptureWorker *) arg)->startCapture();

}

};

在OSX中使用eclipse中的cross g编译器 . 免责声明：C，OpenCV，多线程的新手，希望我避免了一个愚蠢的错误 .