我正在编写我的第一个0程序，只是在我的Macbook上使用相机进行一些图像处理。下面的代码只显示了相机，并允许我按1进行普通视图，2，3或4更改GRB和#include "opencv2/core/core.hpp"
#include "opencv2/flann/miniflann.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/photo/photo.hpp"
#include "opencv2/video/video.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/calib3d/calib3d.hpp"
#include "opencv2/ml/ml.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/core/core_c.h"
#include "opencv2/highgui/highgui_c.h"
#include "opencv2/imgproc/imgproc_c.h"
using namespace cv;
using namespace std;
Mat channel(Mat A, int ich) {
Mat Channel[3];
Mat B = A.clone();
split(B, Channel);
for(int i = 0; i < 3; i++) {
if( ich-1 != i ) Channel[i] = Mat::zeros(B.rows, B.cols, CV_8UC1);
}
merge(Channel, 3, B);
return B;
}
Mat BW(Mat A) {
Mat B;
B = A.clone();
cvtColor( A, B, CV_BGR2GRAY );
return B;
}
int main() {
int waitCount = 1; // wait for this many milliseconds to check for input
VideoCapture stream1(0);
namedWindow("cam", CV_WINDOW_NORMAL);
if( !stream1.isOpened() ) {
cout << "Cannot open camera!" << endl;
}
int showKind = 0;
Mat cameraFrame; // showKind = 0
Mat grey; // showkind = 4
while( true ) {
/// read the cameraFrame
stream1.read(cameraFrame);
/// show the cameraFrame
if( showKind == 0 ) imshow("cam", cameraFrame);
else if( showKind > 0 && showKind < 4 ) imshow("cam", channel(cameraFrame, showKind));
else if( showKind == 4 ) imshow("cam", BW(cameraFrame) );
else {
cout << "ERROR: Unknown showKind = " << showKind << endl;
}
////////////////////////////////////////////////////////////
/// check for input
////////////////////////////////////////////////////////////
// close down
if( waitKey(waitCount) == 27 ) {
cout << "ESC pressed ... exiting" << endl;
break;
}
// convert showKind
else if( waitKey(waitCount) == 48 ) {
cout << "Showkind changed to 0" << endl;
showKind = 0;
}
else if( waitKey(waitCount) == 49 ){
cout << "Showkind changed to 1" << endl;
showKind = 1;
}
else if( waitKey(waitCount) == 50 ){
cout << "Showkind changed to 2" << endl;
showKind = 2;
}
else if( waitKey(waitCount) == 51 ){
cout << "Showkind changed to 3" << endl;
showKind = 3;
}
else if( waitKey(waitCount) == 52 ){
cout << "Showkind changed to 4" << endl;
showKind = 4;
}
}
return 0;
}
将其改为黑白色。
不幸的是，我必须按住键才能做出回应。导致此延迟的原因是什么？我如何让代码对输入更敏感？
<table id="tblLayout" style ="width:100%" cellpadding="0" cellspacing="0" >
<thead>
<tr>
<th style="width:200px"></th>
<th style="width:100px">col1</th>
<th style="width:100px">col2</th>
<th style="width:500px">col3</th>
<th style="width:100px">col4</th>
<th style="width:100px">col5</th>
<th style="width:1200px">col6</th>
<td></td>
</tr>
</thead>
<tbody>
答案 0 :(得分：4)
问题是由您对waitKey的级联调用引起的。您只能拨打key一次，并按下int key = waitKey(waitCount);
if (key == 27) {
cout << "ESC pressed ... exiting" << endl;
break;
}
// convert showKind
else if (key == 48) {
cout << "Showkind changed to 0" << endl;
showKind = 0;
}
else if (key == 49){
cout << "Showkind changed to 1" << endl;
showKind = 1;
}
else if (key == 50){
cout << "Showkind changed to 2" << endl;
showKind = 2;
}
else if (key == 51){
cout << "Showkind changed to 3" << endl;
showKind = 3;
}
else if (key == 52){
cout << "Showkind changed to 4" << endl;
showKind = 4;
}
，例如：
switch#include <opencv2/opencv.hpp>语句也可以更清楚。#include代替所有setTo Channel[i].setTo(0);，因此OutputArray #include <opencv2/opencv.hpp>
using namespace cv;
using namespace std;
Mat channel(const Mat& A, int ich) {
Mat Channel[3];
Mat B;
split(A, Channel);
for (int i = 0; i < 3; i++) {
if (ich - 1 != i) Channel[i].setTo(0);
}
merge(Channel, 3, B);
return B;
}
Mat BW(const Mat& A) {
Mat B;
cvtColor(A, B, CV_BGR2GRAY);
return B;
}
int main() {
int waitCount = 1; // wait for this many milliseconds to check for input
VideoCapture stream1(0);
namedWindow("cam", CV_WINDOW_NORMAL);
if (!stream1.isOpened()) {
cout << "Cannot open camera!" << endl;
}
int showKind = 0;
Mat cameraFrame; // showKind = 0
Mat grey; // showkind = 4
while (true) {
/// read the cameraFrame
stream1 >> cameraFrame;
/// show the cameraFrame
if (showKind == 0) imshow("cam", cameraFrame);
else if (showKind > 0 && showKind < 4) imshow("cam", channel(cameraFrame, showKind));
else if (showKind == 4) imshow("cam", BW(cameraFrame));
else {
cout << "ERROR: Unknown showKind = " << showKind << endl;
}
////////////////////////////////////////////////////////////
/// check for input1
////////////////////////////////////////////////////////////
// close down
int key = waitKey(waitCount);
if (key == 27) {
cout << "ESC pressed ... exiting" << endl;
break;
}
// convert showKind
else if (key == 48) {
cout << "Showkind changed to 0" << endl;
showKind = 0;
}
else if (key == 49){
cout << "Showkind changed to 1" << endl;
showKind = 1;
}
else if (key == 50){
cout << "Showkind changed to 2" << endl;
showKind = 2;
}
else if (key == 51){
cout << "Showkind changed to 3" << endl;
showKind = 3;
}
else if (key == 52){
cout << "Showkind changed to 4" << endl;
showKind = 4;
}
}
return 0;
}
OpenCV函数的矩阵。所以这里的完整代码有一些改进：
default