凸度缺陷C ++ OpenCv [英] Convexity defects C++ OpenCv
问题描述
如果您能帮助我解决这个问题,我们将非常感谢:)
I would be grateful to you if you could help me with this issue :)
关于此问题 cvConvexityDefects在OpenCV 2.X / C ++?,我有同样的问题。
OpenCV C ++包装器没有出现在C版本中的函数cvConvexityDefects,所以我试着编写自己的版本。
Relating to this question cvConvexityDefects in OpenCV 2.X / C++?, I have the same problem. The OpenCV C++ wrapper has not the function cvConvexityDefects that appears in the C version, so I tried to write my own version.
部分代码是请注意,countour和hull都是向量
Part of the code is (please note that both countour and hull are vector< Point >, calculated separately :
CvSeq* contourPoints;
CvSeq* hullPoints;
CvSeq* defects;
CvMemStorage* storage;
CvMemStorage* strDefects;
CvMemStorage* contourStr;
CvMemStorage* hullStr;
CvConvexityDefect *defectArray = 0;
strDefects = cvCreateMemStorage();
defects = cvCreateSeq( CV_SEQ_KIND_GENERIC|CV_32SC2, sizeof(CvSeq),sizeof(CvPoint), strDefects );
//We start converting vector<Point> resulting from findContours
contourStr = cvCreateMemStorage();
contourPoints = cvCreateSeq(CV_SEQ_KIND_GENERIC|CV_32SC2, sizeof(CvSeq), sizeof(CvPoint), contourStr);
printf("Metiendo valores\n");
for(int i=0; i<(int)contour.size(); i++) {
CvPoint cp = {contour[i].x, contour[i].y};
cvSeqPush(contourPoints, &cp);
}
//Now, the hull points obtained from convexHull c++
hullStr = cvCreateMemStorage(0);
hullPoints = cvCreateSeq(CV_SEQ_KIND_GENERIC|CV_32SC2, sizeof(CvSeq), sizeof(CvPoint), hullStr);
for(int i=0; i<(int)hull.size(); i++) {
CvPoint cp = {hull[i].x, hull[i].y};
cvSeqPush(hullPoints, &cp);
}
//And we compute convexity defects
storage = cvCreateMemStorage(0);
defects = cvConvexityDefects(contourPoints, hullPoints, storage);
输出凸面体必须表示为一系列索引或序列函数cvConvexityDefects中的指针
。真的我不知道如何做正确的方式转换,我在网上搜索,并尝试适应/复制/理解一些代码,但它总是与C语法。
The output is Convex hull must represented as a sequence of indices or sequence of pointers in function cvConvexityDefects
. Really I don't know how to do conversion in the right way, I've ben searching on the web and tried to adapt/copy/understand some pieces of code, but it is always with the C syntax.
我希望我很清楚。提前感谢!
I hope I was clear. Thank you in advance!
推荐答案
我提出这个问题是因为我无法找出解决方案今天我正在处理的事情hehe),但毕竟我能够处理这个问题!
I raised this question because I wasn't able to figure out a solution (it is not only today that I was dealing with the matter hehe), but after all I was able to manage the problem!
我不得不改变我计算凸包的方式,使用索引数组形式。所以现在我们有一个向量< int> Point>。
I had to change the way I calculated the convex hull, using the index array form. So now we have a vector< int > instead a vector< Point >.
这是我使用的代码(它适用于我在图像上绘制点):
This is the code I used (it works I painted the points over an image):
void HandDetection::findConvexityDefects(vector<Point>& contour, vector<int>& hull, vector<Point>& convexDefects){
if(hull.size() > 0 && contour.size() > 0){
CvSeq* contourPoints;
CvSeq* defects;
CvMemStorage* storage;
CvMemStorage* strDefects;
CvMemStorage* contourStr;
CvConvexityDefect *defectArray = 0;
strDefects = cvCreateMemStorage();
defects = cvCreateSeq( CV_SEQ_KIND_GENERIC|CV_32SC2, sizeof(CvSeq),sizeof(CvPoint), strDefects );
//We transform our vector<Point> into a CvSeq* object of CvPoint.
contourStr = cvCreateMemStorage();
contourPoints = cvCreateSeq(CV_SEQ_KIND_GENERIC|CV_32SC2, sizeof(CvSeq), sizeof(CvPoint), contourStr);
for(int i=0; i<(int)contour.size(); i++) {
CvPoint cp = {contour[i].x, contour[i].y};
cvSeqPush(contourPoints, &cp);
}
//Now, we do the same thing with the hull index
int count = (int)hull.size();
//int hullK[count];
int* hullK = (int*)malloc(count*sizeof(int));
for(int i=0; i<count; i++){hullK[i] = hull.at(i);}
CvMat hullMat = cvMat(1, count, CV_32SC1, hullK);
//We calculate convexity defects
storage = cvCreateMemStorage(0);
defects = cvConvexityDefects(contourPoints, &hullMat, storage);
defectArray = (CvConvexityDefect*)malloc(sizeof(CvConvexityDefect)*defects->total);
cvCvtSeqToArray(defects, defectArray, CV_WHOLE_SEQ);
//printf("DefectArray %i %i\n",defectArray->end->x, defectArray->end->y);
//We store defects points in the convexDefects parameter.
for(int i = 0; i<defects->total; i++){
CvPoint ptf;
ptf.x = defectArray[i].depth_point->x;
ptf.y = defectArray[i].depth_point->y;
convexDefects.push_back(ptf);
}
//We release memory
cvReleaseMemStorage(contourStr);
cvReleaseMemStorage(strDefects);
cvReleaseMemStorage(storage);
}
}
如果您发现错误或以其他方式管理它,请告诉我!
This worked for me. If you see something wrong or another way to manage it, please tell me!
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