cv::fitEllipse returns wrong result (Bug #1638)

Added by Thomas Pönitz about 13 years ago. Updated almost 13 years ago.

Status:Done Start date:2012-02-29
Priority:Normal Due date:
Assignee:Vadim Pisarevsky % Done:

0%
Category:imgproc, video
Target version:2.4.0
Affected version: Operating System:
Difficulty: HW Platform:
Pull request:

Description

See example:

std::vector<std::vector<cv::Point>> c = ;

cv::Mat rgb(10, 10, CV_8UC3);
cv::drawContours(rgb, c, -1, cv::Scalar(0, 255, 0));
auto ellipse = cv::fitEllipse(c[0]);
std::cout << "Ellipse size: " << ellipse.size.width << " " << ellipse.size.height << std::endl;
cv::ellipse(rgb, ellipse, cv::Scalar(0, 0, 255));
cv::imwrite("/tmp/test.png", rgb);

Output:

Ellipse size: 0.632456 0.632456

test.png (123 Bytes) Thomas Pönitz, 2012-02-29 03:21 pm

Associated revisions

Revision 4eda1662
Added by Vadim Pisarevsky almost 13 years ago

switched back to FitEllipse algorithm by Dr. Daniel Weiss; improved its accuracy in some cases. It fixes #1638

History

#1
Updated by Alexander Shishkov almost 13 years ago

  • Priority changed from High to Normal
  • Target version deleted ()
  • Category set to imgproc, video

#2
Updated by Ivan Korolev almost 13 years ago

  • Assignee set to Ivan Korolev

#3
Updated by Ivan Korolev almost 13 years ago

  • Assignee deleted (Ivan Korolev)

#4
Updated by Vadim Pisarevsky almost 13 years ago

thanks for the detailed bug report! The problem has been fixed in SVN trunk, r7726

#5
Updated by Vadim Pisarevsky almost 13 years ago

  • Status changed from Open to Done
  • Assignee set to Vadim Pisarevsky

#6
Updated by Alexander Shishkov almost 13 years ago

  • Target version set to 2.4.0

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