我想从摄像头中减去两个连续的图像。 正如你所看到的,我正在做一个while循环。在while循环的最后一行,我设置了frame2 = frame
,所以我可以从下一次迭代中减去它们。但是函数cv :: subtract在终端中返回上述错误。为什么函数cv :: subtract()返回错误“输入参数的大小不匹配”?
我做错了什么?
#include <iostream>
#include "core.hpp"
#include "highgui.hpp"
#include "imgcodecs.hpp"
#include "cv.h"
using namespace std;
using namespace cv;
int main(int argc, char* argv[])
{
VideoCapture cap(0); ///open the video camera no. 0 (laptop's default camera)
///make a writer object:
cv::VideoWriter writer;
if (!cap.isOpened()) /// if not success, exit program
{
cout << "ERROR INITIALIZING VIDEO CAPTURE" << endl;
return -1;
}
char* windowName = "Webcam Feed(diff image)";
namedWindow(windowName,WINDOW_NORMAL); ///create a window to display our webcam feed
///we need to define 4 arguments for initializing the writer object:
//filename string:
string filename = "C:\\Users\\PEYMAN\\Desktop\\ForegroundExtraction\\openCV_tutorial\\2.writing from video to file\\Payman.avi";
//fourcc integer:
int fcc = CV_FOURCC('D','I','V','3');
//frame per sec integer:
int fps = 10;
//frame size:
cv::Size framesize(cap.get(CV_CAP_PROP_FRAME_WIDTH),cap.get(CV_CAP_PROP_FRAME_HEIGHT));
///initialize the writet object:
writer = VideoWriter(filename,fcc,fps,framesize);
if(!writer.isOpened()){
cout << "Error opening the file" << endl;
getchar();
return -1;
}
int counter = 0;
while (1) {
Mat frame,frame2,diff_frame;
///read a new frame from camera feed and save it to the variable frame:
bool bSuccess = cap.read(frame);
if (!bSuccess) ///test if frame successfully read
{
cout << "ERROR READING FRAME FROM CAMERA FEED" << endl;
break;
}
/// now the last read frame is stored in the variable frame and here it is written to the file:
writer.write(frame);
if (counter > 0){
cv::subtract(frame2,frame,diff_frame);
imshow(windowName, diff_frame); ///show the frame in "MyVideo" window
}
///wait for 10ms for a key to be pressed
switch(waitKey(1)){
///the writing from webcam feed will go on until the user presses "esc":
case 27:
///'esc' has been pressed (ASCII value for 'esc' is 27)
///exit program.
return 0;
}
frame2 = frame;
counter++;
}
return 0;
}
尝试在复制帧时使用frame2 = frame.clone()。你可以使用'frame2 = frame2 - frame'或'frame2 - = frame'而不是'cv :: subtract(不需要) – rhcpfan
@rhcpfan更好,使用'cv:swap(frame,frame2);' –