OpenCV錯誤：使用fitLine時斷言失敗

Question

我想使用fitLine函數來創建一條線來繪製我的源圖像src_crop。我在我的main()中加載框架並致電drawLine()。 但代碼中止與以下錯誤：

代碼：

#include "stdafx.h" 
#include <fstream> 
#include <iostream> 
#include <vector> 
#include <stdlib.h> 
#include <stdio.h> 

#include "opencv2/imgproc/imgproc.hpp" 
#include "opencv2/highgui/highgui.hpp" 

using namespace std; 
using namespace cv; 

/// Global variables 

Mat src_gray; 
Mat src_crop; 
Mat dst, detected_edges; 

int edgeThresh = 1; 
int lowThreshold = 27; 
int const max_lowThreshold = 100; 
int ratio = 3; 
int kernel_size = 3; 
char* window_name = "Edge Map"; 
int i,j; 

void drawLine(int, void*) 
{ 
    vector<Vec4f> outline; 
    vector<Point2f> ssline; 

    int flag2 = 0; 


    /// Reduce noise with a kernel 3x3 
    blur(src_gray, detected_edges, Size(3, 3)); 



    /// Canny detector 
    Canny(detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size); 

    /// Using Canny's output as a mask, we display our result 
    dst.create(detected_edges.size(), detected_edges.type()); 
    dst = Scalar::all(0); 
    src_crop.copyTo(dst, detected_edges); 
    //namedWindow("Detected Edges", CV_WINDOW_AUTOSIZE); 
    //imshow("Detected Edges", detected_edges); 


    cvtColor(dst, dst, CV_BGR2GRAY); 


for (j = 0; j < dst.cols; j++) 
{ 
    for (i = 0; i < dst.rows; i++) 
    { 

     if (Scalar(dst.at<uchar>(i,j)).val[0] >= 90) 
     { 
      //cout << "Hi"; 
      flag2 = 1; 
      break; 
     } 

    } 
    if (flag2 == 1) 
     break; 
} 
int k = j; 
int l = i; 


for (j = k; j < dst.cols; j++) 
{ 

    Point2f ss = Point2f(l,j); 
    ssline.push_back(ss); 

} 

fitLine(ssline, outline, CV_DIST_L1, 0, 0.01, 0.01); 

//imshow("Result", src_crop); 


} 

int main(int argc, char** argv) 
{ 

    /// Load an image 
    src = imread(s); 


    if (!src.data) 
    { 
     return -1; 
    } 

    /// Create a matrix of the same type and size as src (for dst) 
    //dst.create(src.size(), src.type()); 


    src_crop = src; 
    /// Convert the image to grayscale 
    cvtColor(src_crop, src_gray, CV_BGR2GRAY); 


    /// Create a window 
    namedWindow(window_name, CV_WINDOW_AUTOSIZE); 

    /// Create a Trackbar for user to enter threshold 
    createTrackbar("Min Threshold:", window_name, &lowThreshold, max_lowThreshold, drawLine); 

    /// Show the image 
    drawLine(0, 0); 

    if (waitKey(30) >= 0) break; 

    return 0; 

} 

代碼停在點fitLine()工作被調用。我通過使用printf語句測試代碼發現了這一點。

任何人都可以幫助我解決問題嗎？

Answer 1

拋開你的代碼不能編譯的事實，問題是，你傳遞給fitLine參數outline爲vector<Vec4f>，而應該是一個Vec4f。

變化outline聲明如下：

Vec4f outline;