OpenCv凸包缺陷 [英] OpenCv Convexity Defects

问题描述

我通过一些例子，我在网上找到使用opencv c ++ 2.4.4创建凸包。我正在调查使用凸面缺陷，但遇到了问题的这些类的C ++实现

我已经按照以下链接，因为它是最类似于我的问题，仍然没有运气。 使用c ++中的OpenCV 2.4计算凸度偏差

我收到以下错误。

  openCV错误：Assertion failed（mtype == type0 ||（CV_MAT_CN（mtype）== 1&& 1<<< type0）& fixedDepthMask）！= 0））in create 
  

按当前代码粘贴。

感谢您的任何帮助，

  int c = 
 VideoCapture cap（0）; 
 
垫框架; 
 Mat边缘; 
 mat threshold_output; 
 cv :: vector< cv :: Vec4i>层次; 
 std :: vector< std :: vector< cv :: Point> >轮廓; 
 RNG rng（12345）; 
 
 while（c！= 27）
 {
 cap>>帧; 
 cvtColor（frame，edges，CV_BGR2GRAY）; 
 
 threshold（edges，threshold_output，100，255，CV_THRESH_OTSU）; 
 findContours（threshold_output，contour，hierarchy，CV_RETR_EXTERNAL，CV_CHAIN_APPROX_SIMPLE，cv :: Point（0，0））; 
 
 std :: vector< Vec4i>缺陷; 
 vector< cv :: vector< int> > hull（contours.size（））; 
 
 for（int i = 0; i  {
 convexHull（contoururs [i]，hull [i]，false）; 
 if（contoururs [i] .size（）> 3）
 {
 convexityDefects（contoururs [i]，hull [i]，defects [i]）; 
} 
} 
} 
  

解决方案>

  std :: vector< Vec4i>缺陷; 
  

应为

  std :: vector< std :: vector< Vec4i> > defect（contours.size（））; 
  

（每个轮廓/船体一个）

I am working through some examples I have found online to create convex hulls using opencv c++ 2.4.4. I was looking into using convexity defects but am running into issues with the c++ implementation of these classes

I have followed the link below as it is the most similar to my issue but still no luck. Calculating convexityDefects using OpenCV 2.4 in c++

I am recieving the error below.

openCV Error: Assertion failed (mtype == type0 || (CV_MAT_CN(mtype) == 1 && ((1 << type0) & fixedDepthMask) != 0)) in create

Additionally I have pasted by current code below.

Thank you for any help,

int c = 0;
VideoCapture cap(0);

Mat frame;
Mat edges;
Mat threshold_output;
cv::vector<cv::Vec4i> hierarchy;
std::vector<std::vector<cv::Point> > contours;
RNG rng(12345);

while( c != 27)
{
    cap >> frame;
    cvtColor(frame, edges, CV_BGR2GRAY);

    threshold(edges, threshold_output, 100, 255, CV_THRESH_OTSU );
    findContours( threshold_output, contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, cv::Point(0, 0));

    std::vector<Vec4i> defects;
    vector<cv::vector<int> >hull( contours.size() );

    for (int i = 0; i < contours.size(); i++)
    {
        convexHull(contours[i], hull[i], false );
        if (contours[i].size() >3 )
        {
            convexityDefects(contours[i], hull[i], defects[i]);
        }
    }
}

解决方案

std::vector<Vec4i> defects;   

should be

std::vector< std::vector<Vec4i> > defects( contours.size() );

(one for each contour / hull)

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