For 循环结束自身并终止运行程序但在删除斜率计算语句时正确运行

Question

我正在使用 opencv 的概率霍夫线函数扫描图像的候选 ROI 以寻找线条，然后计算每条检测到的线条的斜率。如果否，则内部 For 循环自行结束并终止运行程序。为每个 ROI 检测到的线数大于 5，但在删除斜率计算语句后运行正确。我正在使用 eclipse Luna 4.4.0。 Mat ini[]用于存储每个候选ROI

for (int m = 0; m < cnt; m++)
{
    if (selected[m] == true)
    {
        vector<Vec4i> lines;
        vector<Vec4i> v_lines;
        vector<Vec4i> h_lines;
        int vl_cnt = 0;
        int hl_cnt = 0;

        // lines are detected in rectangle number m
        HoughLinesP(ini[m], lines, 1, CV_PI / 180, 40,
                             (ini[m].cols) / 3, (ini[m].cols) / 5); 

        float slope = 0;
        for (size_t i = 0; i < lines.size(); i++ )
        {
            cout << "0";
            Vec4i p = lines[i];
            cout << "1";
            slope = ((p[3] - p[1]) / (p[2] - p[0])); // removing this statement fixes the unexpected termination
            cout << slope;
        }
    }
}

Answer 1

当 p[2] - p[0] == 0 时，您似乎遇到了 除以零 错误。简单地用类似的东西来防止它：

float run = p[2] - p[0];
if (run != 0) {
    slope = ((p[3] - p[1]) / run);
} else {
    // handle no run 
}

For 循环结束自身并终止运行程序但在删除斜率计算语句时正确运行

For loop ends itself and terminates the running program but runs correctly when the slope calculation statement is removed

c++

eclipse

opencv

For 循环结束自身并终止 运行 程序但在删除斜率计算语句时正确运行

For loop ends itself and terminates the running program but runs correctly when the slope calculation statement is removed

c++

eclipse

opencv

For 循环结束自身并终止运行程序但在删除斜率计算语句时正确运行