在 OpenCV 中对 cvConvexHull2() 的结果使用 cvApproxPoly()

发布于 2025-01-03 15:34:14 字数 760 浏览 2 评论 0原文

我正在编写 C（不是 C++）代码来在矩形轮廓上运行凸包。（大大简化的）代码如下所示：

CvSeq* contours;
CvSeq* hull;

cvFindContours( img, &contours, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, CvPoint(0,0) );
hull = cvConvexHull2( contours, storage, CV_CLOCKWISE, 0 );

其中 img 和 contours 都是有效的。这些行之间还有很多内容，但其中的 FindContours 部分已经过测试可以正常工作。

此代码抛出异常：错误：cvApproxPoly 中的参数错误（不支持的序列类型）。

我被告知问题是标识序列的标志由于未设置折线，我尝试了建议 hull->flags = hull->flags | 512 但大概这些标志在 2008 年至今的某个时间发生了变化，因为那不起作用。

所以问题是：如何在 cvConvexHull2() 的结果上使用 cvApproxPoly() ？我应该使用什么数据类型，cvApproxPoly() 的正确参数是什么？

原文

I'm writing C (not C++) code to run convex hull on contours of rectangles. The (greatly simplified) code for that looks like this:

CvSeq* contours;
CvSeq* hull;

cvFindContours( img, &contours, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, CvPoint(0,0) );
hull = cvConvexHull2( contours, storage, CV_CLOCKWISE, 0 );

Where img and contours are both valid. There is a lot more between these lines, but the FindContours portion of it has been tested to work.

This code throws exception: Error: Bad argument (Unsupported sequence type) in cvApproxPoly.

I'm told that the problem is that the flag that identifies the sequence as a polyline is not set, and I have tried the suggestion hull->flags = hull->flags | 512 but presumably the flags have changed sometime between 2008 and now, since that does not work.

So the question is: how do I use cvApproxPoly() on the results of a cvConvexHull2()? What data type should I use, and what are the proper arguments for cvApproxPoly()?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

打小就很酷 2025-01-10 15:34:15

我认为您缺少存储参数：

cvFindContours(<CvArr *image>, <CvMemStorage *storage>, <CvSeq **first_contour>, <int header_size>, <int mode>, <int method>, <CvPoint offset>)

测试使用

CvMemStorage *storage = cvCreateMemStorage(0);
cvFindContours( img, storage, &contours, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, CvPoint(0,0) );
hull = cvConvexHull2( contours, storage, CV_CLOCKWISE, 0 );

I think you are missing the storage parameter:

cvFindContours(<CvArr *image>, <CvMemStorage *storage>, <CvSeq **first_contour>, <int header_size>, <int mode>, <int method>, <CvPoint offset>)

Test using

CvMemStorage *storage = cvCreateMemStorage(0);
cvFindContours( img, storage, &contours, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, CvPoint(0,0) );
hull = cvConvexHull2( contours, storage, CV_CLOCKWISE, 0 );

回复收藏 0 原文

~没有更多了~