使用 Visual Studio 2019 编译时，以下代码会产生错误。
// ImageSubtractionCpp.sln
// main.cpp
#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
using namespace cv;
#include<iostream>
#ifdef WINDOWS
#include<conio.h> // it may be necessary to change or remove this line if not using Windows
#endif
#include "Blob.h"
// global variables ///////////////////////////////////////////////////////////////////////////////
const cv::Scalar SCALAR_BLACK = cv::Scalar(0.0, 0.0, 0.0);
const cv::Scalar SCALAR_WHITE = cv::Scalar(255.0, 255.0, 255.0);
const cv::Scalar SCALAR_BLUE = cv::Scalar(255.0, 0.0, 0.0);
const cv::Scalar SCALAR_GREEN = cv::Scalar(0.0, 200.0, 0.0);
const cv::Scalar SCALAR_RED = cv::Scalar(0.0, 0.0, 255.0);
///////////////////////////////////////////////////////////////////////////////////////////////////
int main(void) {
cv::VideoCapture capVideo;
cv::Mat imgFrame1;
cv::Mat imgFrame2;
capVideo.open("768x576.avi");
if (!capVideo.isOpened()) { // if unable to open video file
std::cout << "\nerror reading video file" << std::endl << std::endl; // show error message
#ifdef WINDOWS
_getch(); // it may be necessary to change or remove this line if not using Windows
#endif
return(0); // and exit program
}
if (capVideo.get(CV_CAP_PROP_FRAME_COUNT) < 2) {
std::cout << "\nerror: video file must have at least two frames";
#ifdef WINDOWS
_getch();
#endif
return(0);
}
capVideo.read(imgFrame1);
capVideo.read(imgFrame2);
char chCheckForEscKey = 0;
while (capVideo.isOpened() && chCheckForEscKey != 27) {
std::vector<Blob> blobs;
cv::Mat imgFrame1Copy = imgFrame1.clone();
cv::Mat imgFrame2Copy = imgFrame2.clone();
cv::Mat imgDifference;
cv::Mat imgThresh;
cv::cvtColor(imgFrame1Copy, imgFrame1Copy, cv::COLOR_BGR2GRAY);
cv::cvtColor(imgFrame2Copy, imgFrame2Copy, cv::COLOR_BGR2GRAY);
cv::GaussianBlur(imgFrame1Copy, imgFrame1Copy, cv::Size(5, 5), 0);
cv::GaussianBlur(imgFrame2Copy, imgFrame2Copy, cv::Size(5, 5), 0);
cv::absdiff(imgFrame1Copy, imgFrame2Copy, imgDifference);
cv::threshold(imgDifference, imgThresh, 30, 255.0, CV_THRESH_BINARY);
cv::imshow("imgThresh", imgThresh);
cv::Mat structuringElement3x3 = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(3, 3));
cv::Mat structuringElement5x5 = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(5, 5));
cv::Mat structuringElement7x7 = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(7, 7));
cv::Mat structuringElement9x9 = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(9, 9));
cv::dilate(imgThresh, imgThresh, structuringElement5x5);
cv::dilate(imgThresh, imgThresh, structuringElement5x5);
cv::erode(imgThresh, imgThresh, structuringElement5x5);
cv::Mat imgThreshCopy = imgThresh.clone();
std::vector<std::vector<cv::Point> > contours;
cv::findContours(imgThreshCopy, contours, cv::RETR_EXTERNAL, cv::CHAIN_APPROX_SIMPLE);
cv::Mat imgContours(imgThresh.size(), CV_8UC3, SCALAR_BLACK);
cv::drawContours(imgContours, contours, -1, SCALAR_WHITE, -1);
cv::imshow("imgContours", imgContours);
std::vector<std::vector<cv::Point> > convexHulls(contours.size());
for (unsigned int i = 0; i < contours.size(); i++) {
cv::convexHull(contours[i], convexHulls[i]);
}
for (auto& convexHull : convexHulls) {
Blob possibleBlob(convexHull);
if (possibleBlob.boundingRect.area() > 100 &&
possibleBlob.dblAspectRatio >= 0.2 &&
possibleBlob.dblAspectRatio <= 1.2 &&
possibleBlob.boundingRect.width > 15 &&
possibleBlob.boundingRect.height > 20 &&
possibleBlob.dblDiagonalSize > 30.0) {
blobs.push_back(possibleBlob);
}
}
cv::Mat imgConvexHulls(imgThresh.size(), CV_8UC3, SCALAR_BLACK);
convexHulls.clear();
for (auto& blob : blobs) {
convexHulls.push_back(blob.contour);
}
cv::drawContours(imgConvexHulls, convexHulls, -1, SCALAR_WHITE, -1);
cv::imshow("imgConvexHulls", imgConvexHulls);
imgFrame2Copy = imgFrame2.clone(); // get another copy of frame 2 since we changed the previous frame 2 copy in the processing above
for (auto& blob : blobs) { // for each blob
cv::rectangle(imgFrame2Copy, blob.boundingRect, SCALAR_RED, 2); // draw a red box around the blob
cv::circle(imgFrame2Copy, blob.centerPosition, 3, SCALAR_GREEN, -1); // draw a filled-in green circle at the center
}
cv::imshow("imgFrame2Copy", imgFrame2Copy);
// now we prepare for the next iteration
imgFrame1 = imgFrame2.clone(); // move frame 1 up to where frame 2 is
if ((capVideo.get(CV_CAP_PROP_POS_FRAMES) + 1) < capVideo.get(CV_CAP_PROP_FRAME_COUNT)) { // if there is at least one more frame
capVideo.read(imgFrame2); // read it
}
else { // else
std::cout << "end of video\n"; // show end of video message
break; // and jump out of while loop
}
chCheckForEscKey = cv::waitKey(1); // get key press in case user pressed esc
}
if (chCheckForEscKey != 27) { // if the user did not press esc (i.e. we reached the end of the video)
cv::waitKey(0); // hold the windows open to allow the "end of video" message to show
}
// note that if the user did press esc, we don't need to hold the windows open, we can simply let the program end which will close the windows
return(0);
}
Error C2660 'cv::threshold': function does not take 4 arguments imagesubstraction C:\Users\admin\source\repos\imagesubstraction\main.cpp 73
Error C2065 'CV_CAP_PROP_FRAME_COUNT': undeclared identifier imagesubstraction C:\Users\admin\source\repos\imagesubstraction\main.cpp 142
Error (active) E0020 identifier "CV_CAP_PROP_FRAME_COUNT" is undefined imagesubstraction C:\Users\admin\source\repos\imagesubstraction\main.cpp 42
Error (active) E0020 identifier "CV_THRESH_BINARY" is undefined imagesubstraction C:\Users\admin\source\repos\imagesubstraction\main.cpp 73
Error (active) E0020 identifier "CV_CAP_PROP_POS_FRAMES" is undefined imagesubstraction C:\Users\admin\source\repos\imagesubstraction\main.cpp 142
Error C2039 'CV_CAP_PROP_FRAME_COUNT': is not a member of 'cv::VideoCapture' imagesubstraction C:\Users\admin\source\repos\imagesubstraction\main.cpp 42
Error C2882 'cv': illegal use of namespace identifier in expression imagesubstraction C:\Users\admin\source\repos\imagesubstraction\main.cpp 73
Error C2882 'cv': illegal use of namespace identifier in expression imagesubstraction C:\Users\admin\source\repos\imagesubstraction\main.cpp 142