我在尝试运行我的程序时收到段错误。在修改我的程序以在不同的线程上从两个摄像头捕获帧后,我只收到段错误。我在两个线程上使用相同的函数,我想知道这是否是问题所在。
主要.c
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <time.h>
#include <opencv2/opencv.hpp>
#include "ThreadedWebcamCapture.h"
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
int main(){
ThreadedCapture Capture1;
Capture1.STOP = 0;
Capture1.CAP_NUMBER = 1;
Capture1.X_RESOLUTION = 640;
Capture1.Y_RESOLUTION = 480;
ThreadedCapture Capture2;
Capture2.STOP = 0;
Capture2.CAP_NUMBER = 0;
Capture2.X_RESOLUTION = 640;
Capture2.Y_RESOLUTION = 480;
pthread_t Capture1Thread;
int Capture1ThreadRetCode;
pthread_t Capture2Thread;
int Capture2ThreadRetCode;
printf("[INFO]Creating Threads\n");
Capture1ThreadRetCode = pthread_create(&Capture1Thread, NULL, &Capture_Thread, (void *)&Capture1);
printf("[INFO]Created Thread 1");
Capture2ThreadRetCode = pthread_create(&Capture2Thread, NULL, &Capture_Thread, (void *)&Capture2); //I think the error is occurring here
if(Capture1ThreadRetCode || Capture2ThreadRetCode != 0){
printf("[ERROR]Thread Creation Failed!\n");
exit(EXIT_FAILURE);
}
//cv::namedWindow("Window", cv::WINDOW_AUTOSIZE);
int NumberOfFrames;
time_t Seconds1;
Seconds1 = time(NULL);
cv::Mat Output;
while(1 == 1){
pthread_mutex_lock(&mutex1);
if(!Capture1.FRAME.empty() || !Capture2.FRAME.empty()){
cv::hconcat(Capture1.FRAME, Capture2.FRAME, Output);
}
pthread_mutex_unlock(&mutex1);
if(!Output.empty()){
NumberOfFrames = NumberOfFrames + 1;
cv::imshow("Window", Output);
}
if(cv::waitKeyEx(1) >= 0){
Capture1.STOP = 1;
Capture2.STOP = 1;
break;
}
}
time_t Seconds2;
Seconds2 = time(NULL);
int Seconds = Seconds2 - Seconds1;
int FPS = NumberOfFrames / Seconds;
printf("[INFO]FPS %d\n", FPS);
pthread_join(Capture1Thread, NULL);
pthread_join(Capture2Thread, NULL);
printf("[INFO]Done\n");
return(0);
}
cv线程.c
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <opencv2/opencv.hpp>
#include "ThreadedWebcamCapture.h"
void *Capture_Thread(void* Test){
ThreadedCapture *Testing = (ThreadedCapture *) Test;
cv::VideoCapture CAP ((*Testing).CAP_NUMBER);
CAP.set(CV_CAP_PROP_FRAME_WIDTH, (*Testing).X_RESOLUTION);
CAP.set(CV_CAP_PROP_FRAME_HEIGHT, (*Testing).Y_RESOLUTION);
while((*Testing).STOP != 1){
CAP.read((*Testing).FRAME);
}
return(NULL);
}
ThreadedWebcamCapture.h
#ifndef _THREADEDWEBCAMCAPTURE_H_
#define _THREADEDWEBCAMCAPTURE_H_
void *Capture_Thread(void* Test);
typedef struct ThreadedCaptures {
int STOP;
int CAP_NUMBER;
int X_RESOLUTION;
int Y_RESOLUTION;
cv::Mat FRAME;
} ThreadedCapture;
#endif
最佳答案
你的问题是 cv::hconcat
函数,特别是传递两个 cv::Mat
具有不同行数的对象。如果您查看 documentation的 cv::hconcat
函数,它表示给定的两个矩阵必须具有相同的行数。您还可以看到,在 strace 结果的最后几行中,有一个断言错误表明发送到 cv::hconcat
的行数。不相等。
"OpenCV Error: Assertion failed ("..., 205OpenCV Error: Assertion failed (src[i].dims <= 2 && src[i].rows == src[0].rows && src[i].type() == src[0].type()) in hconcat, file /builddir/build/BUILD/opencv-3.2.0/modules/core/src/matrix.cpp, line 2865
现在,这个错误的原因在这些行中:
if(!Capture1.FRAME.empty() || !Capture2.FRAME.empty()){
cv::hconcat(Capture1.FRAME, Capture2.FRAME, Output);
}
如果任何矩阵不为空,则执行水平连接操作。但是,这意味着其中一个矩阵的大小可能为 640x480,而另一个矩阵的大小可能为 0x0。在这种情况下,cv::hconcat
抛出一个断言错误并且你的程序崩溃。要修复它,请尝试将条件更改为
if(!Capture1.FRAME.empty() && !Capture2.FRAME.empty()){
cv::hconcat(Capture1.FRAME, Capture2.FRAME, Output);
}
只有当两个矩阵都不为空时才执行操作。自您构建 ThreadedCapture
以来,它们应该具有相同的行数具有相同行数的对象。
引用资料
关于c++ - Opencv Segmentation Fault 使用 pthread 捕获帧 C++,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47010201/