Ask Your Question

fitLine always crashes

asked 2013-06-03 04:37:14 -0600

vlad_tepesch gravatar image

Hi i try to use fitLine but it always crashes. I already tried to modify input data (cv::Mat, std::vector<cv::pointd>) and output data(cv::Vect4d, std::vector<cv::pointd>(2), std::vector<double>(4)) formats.

Here is my Code:

std::vector<cv::Point2d> points;
// [...] // push_back some (26) points
std::vector<double> line(4,0);

now it crashes. Iam using winxp VS2010 with a opencv 2.41 build I got no call stack and the crash seems to happen in kernel32.dll xstring

Where is my failure?

edit retag flag offensive close merge delete

1 answer

Sort by ยป oldest newest most voted

answered 2013-06-03 05:16:49 -0600

berak gravatar image
  • make the input Point2f, not Point2d
  • make the output Vec4f // a single one

std::vector<cv::Point2f> points;
Vec4f line;
edit flag offensive delete link more



Thank you very much. But now, please point me to the part of documentation that tells me that only float input data is supported.

vlad_tepesch gravatar imagevlad_tepesch ( 2013-06-03 05:30:23 -0600 )edit

hmm, indeed it's not mentioned there (but should be!)

if you try with Point2d, you'll get an exception, complaining about the point-depth not being float, so it's probably a matter of experience

berak gravatar imageberak ( 2013-06-03 05:36:57 -0600 )edit

@berak i have not got any exception that sounds like that. The exception that occurred was on crt or os level.

vlad_tepesch gravatar imagevlad_tepesch ( 2013-06-03 05:58:33 -0600 )edit

hmm, i got an opencv exception there, not a kernel one.

no idea why you get that.

got neither 2.4.1, nor vs2010, so can't reproduce exactly

berak gravatar imageberak ( 2013-06-03 06:03:13 -0600 )edit

I obtained exception when trying wCvInvoke.cvFitLine with EmguCV : "OpenCV: Input sequence must consist of 2d points or 3d points". After this I have not found in documentation about OpenCV fitLine, just this answer clarfied issue.

sergtk gravatar imagesergtk ( 2014-01-12 14:10:23 -0600 )edit

Question Tools


Asked: 2013-06-03 04:37:14 -0600

Seen: 2,671 times

Last updated: Jun 03 '13