[英]OpenCV's calcOpticalFlowPyrLK throws exception
我一直试图用OpenCV形成一个小的光流示例。 一切正常,除了函数调用calcOpticalFlowPyrLK,它在控制台窗口中打印以下失败的断言:
OpenCV错误:断言失败(mytype == typ0 ||(CV_MAT_CN(mytype)== CV_MAT_CV(type0)&&((1 << type0)&fixedDepthMask)!= 0))在未知函数中,文件...... \\ src \\ opencv \\ modules \\ core \\ src \\ matrix.cpp,第1421行
我正在解析的视频分为300个图像,标记为“caml00000.jpeg”,“caml00001.jpeg”,...,“caml00299.jpeg”。 这是我写的代码:
#include <cv.h>
#include "opencv2/highgui/highgui.hpp"
using namespace cv;
using namespace std;
int main( int argc, char** argv ){
char buff[100];
int numFrames=300;
char fileFormat[]="images/caml%05d.jpeg";
string winname="Test Window";
vector<Mat> imgVec(numFrames);
auto itrImg=begin(imgVec);
auto itrEnd=end(imgVec);
vector<Point2f> featuresPrevious;
vector<Point2f> featuresCurrent;
namedWindow( winname, CV_WINDOW_AUTOSIZE );
int fileNum=0;
while(itrImg!=itrEnd){
Mat& imgRef=*itrImg; //get this frame's Mat from the vector iterator
//Calculate the name of the file;
sprintf(buff,fileFormat,fileNum);
string fileName=buff;
//string fileName="kitty.jpg"; //attempted using a static picture as well
cout << fileName << endl;
Mat cImage=imread(fileName, CV_LOAD_IMAGE_GRAYSCALE);
cImage.convertTo(imgRef, CV_8U); //also tried CV_8UC1
featuresPrevious=std::move(featuresCurrent);
goodFeaturesToTrack(imgRef,featuresCurrent,30, 0.01, 30); //calculate the features for use in next iteration
if(!imgRef.data){ //this never executes, so there isn't a problem reading the files
cout << "File I/O Problem!" << endl;
getchar();
return 1;
}
if(fileNum>0){
Mat& lastImgRef=*(itrImg-1); //get the last frame's image
vector<Point2f> featuresNextPos;
vector<char> featuresFound;
vector<int> err;
calcOpticalFlowPyrLK(lastImgRef,imgRef,featuresPrevious,featuresNextPos,featuresFound,err); //problem line
//Draw lines connecting previous position and current position
for(size_t i=0; i<featuresNextPos.size(); i++){
if(featuresFound[i]){
line(imgRef,featuresPrevious[i],featuresNextPos[i],Scalar(0,0,255));
}
}
}
imshow(winname, imgRef);
waitKey(1000/60); //not perfect, but it'll do
++itrImg;
++fileNum;
}
waitKey(0);
return 0;
}
关于这个例外,我唯一看到的是它是在Mats采用不同格式时引起的,但是我尝试过读取静态图像(参见上面关于“kitty.jpg”的代码),我仍然得到同样失败的断言。 有任何想法吗?
更改线条vector<char> featuresFound;
to vector<uchar> featuresFound;
和vector<int> err;
Mat err;
我无法解释为什么,但这就是必须要做的。
编辑:正如@Sluki在评论中所说 - 错误的向量必须存储在浮点精度std :: vector或cv :: Mat中。
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