# \#hough **URL:** https://forum.opencv.org/tag/hough/395.md [Latest](https://forum.opencv.org/latest.md) · [Categories](https://forum.opencv.org/categories.md) · [Tags](https://forum.opencv.org/tags.md) --- ## [HoughCircles - finding false positives - help with parameters?](https://forum.opencv.org/t/houghcircles-finding-false-positives-help-with-parameters/24654)
**Author:** [@descott12](https://forum.opencv.org/u/descott12)\ **Replies:** 6\ **Last updated:** [August 5, 2026, 12:46am UTC](https://forum.opencv.org/t/houghcircles-finding-false-positives-help-with-parameters/24654 "2026-08-05T00:46:15Z")
Hello all. Pretty new to Python and Open CV. The following code is detecting circles that don’t exist. I have tweaked the parameters quite a bit but can’t quite get rid of them. In the image, only the two on the right a… --- ## [Horizon identification](https://forum.opencv.org/t/horizon-identification/18671)
**Author:** [@anoduck](https://forum.opencv.org/u/anoduck)\ **Replies:** 0\ **Last updated:** [September 4, 2024, 11:04pm UTC](https://forum.opencv.org/t/horizon-identification/18671 "2024-09-04T23:04:30Z")
We have several game cameras. When the battery runs out, the clock is reset, which invalidates the timestamp. So we devised a way to estimate the time and date based on the position of the sun, like a sun dial. We need … --- ## [Does get pose estimation on ball or spherical shape possible on tomato?](https://forum.opencv.org/t/does-get-pose-estimation-on-ball-or-spherical-shape-possible-on-tomato/18364)
**Author:** [@thesharkgeek](https://forum.opencv.org/u/thesharkgeek)\ **Replies:** 1\ **Last updated:** [July 28, 2024, 9:06am UTC](https://forum.opencv.org/t/does-get-pose-estimation-on-ball-or-spherical-shape-possible-on-tomato/18364 "2024-07-28T09:06:46Z")
Hi, im looking for a solution for my last assignment in polytechnic. I already implement canny edge and centroid estimate radius with some smoothing gaussian, deque every 2 sec is bit slow but can get job done for singl… --- ## [Thoughts on a project](https://forum.opencv.org/t/thoughts-on-a-project/9600)
**Author:** [@svara](https://forum.opencv.org/u/svara)\ **Replies:** 0\ **Last updated:** [July 22, 2022, 10:16pm UTC](https://forum.opencv.org/t/thoughts-on-a-project/9600 "2022-07-22T22:16:18Z")
Hello, I am trying to achieve the following result using opencv and computer vision techniques. Kindly suggest me ideas on how can we possibly solve the problem: I am trying to draw curves around a circle to understand… --- ## [Is there any change in hough circle detection from opencv 2 to opencv 4?](https://forum.opencv.org/t/is-there-any-change-in-hough-circle-detection-from-opencv-2-to-opencv-4/17208)
**Author:** [@vps](https://forum.opencv.org/u/vps)\ **Replies:** 0\ **Last updated:** [April 8, 2024, 2:27pm UTC](https://forum.opencv.org/t/is-there-any-change-in-hough-circle-detection-from-opencv-2-to-opencv-4/17208 "2024-04-08T14:27:33Z")
Hi all, I am upgrading the OpenCV 4 from OpenCV 2. I observed that the results of though circle detection are different in both versions. Opencv 2 provides better results than opencv 4. Does anyone have any idea about i… --- ## [HoughCircles with Known Center](https://forum.opencv.org/t/houghcircles-with-known-center/12553)
**Author:** [@Alex\_Rothberg](https://forum.opencv.org/u/Alex_Rothberg)\ **Replies:** 1\ **Last updated:** [March 29, 2023, 3:03am UTC](https://forum.opencv.org/t/houghcircles-with-known-center/12553 "2023-03-29T03:03:39Z")
I am looking to use HoughCircles to find circles where I have a strong prior on where the circle center(s) are. Is there any easy way to incorporate that information into the Hough Circles algorithm? i.e. I mostly want t… --- ## [Circle Detection for Fourier-Mellin Shear Estimation](https://forum.opencv.org/t/circle-detection-for-fourier-mellin-shear-estimation/7674)
**Author:** [@der\_luftmensch](https://forum.opencv.org/u/der_luftmensch)\ **Replies:** 15\ **Last updated:** [February 23, 2022, 9:45pm UTC](https://forum.opencv.org/t/circle-detection-for-fourier-mellin-shear-estimation/7674 "2022-02-23T21:45:25Z")
I have the following cross-correlation image: This image is originally 0-1 floats. I need to detect the circle in the image, but I am having trouble doing so with cv::HoughCircles. Clearly, I’d prefer not to be force…