You can use drawContours() function:

cv2.drawContours(img, contours, -1, (0,255,0), 3)

The documentation explains it well:

http://docs.opencv.org/master/d4/d73/tutorial_py_contours_begin.html#gsc.tab=0

OpenCV 中的轮廓应用- 知乎

https://zhuanlan.zhihu.com/p/77783347

2020年3月24日 ... 轮廓是形状分析、物体检测和识别的有用工具。 ... contours 为包含图像中所有轮廓 的python列表(三维数组),每个轮廓是包含边界所有坐标 ... 所有轮廓;第四个 参数是轮廓颜色、第五个参数是轮廓线的宽度,为-1时表示填充。

Contours : Getting Started - OpenCV

https://docs.opencv.org/3.4/d4/d73/tutorial_py_contours_begin.html

Learn to find contours, draw contours etc; You will see these functions : cv. ... a modified image, the contours and hierarchy. contours is a Python list of all the contours in the image. ... Do you need all the points on the line to represent that line?

opencv---边沿检测、轮廓轮廓特征、轮廓层级_xys430381_1的 ...

https://blog.csdn.net/xys430381_1/article/details/106910741

2020年6月22日 ... 边缘检测,框出物体的轮廓(使用opencv-python)OpenCV 中的轮廓应用感 ... 物体 的轮廓(固定摄像头, opencv-python)OpenCV图像处理-轮廓和轮廓特征 ... 为了获得 理想的车辆轮廓线,提出了一种基于开源计算机视觉库OpenCV的 ...

边缘检测,框出物体的轮廓(使用opencv-python) - 知乎

https://zhuanlan.zhihu.com/p/38739563

蓝色等高线轮廓、绿色贴合轮廓、红色包围轮廓. 核心代码预览:. thresh, contours, hierarchy = cv2 ...

OpenCV shape detection - PyImageSearch

https://www.pyimagesearch.com/2016/02/08/opencv-shape-detection/

Feb 8, 2016 ... Contour approximation is actually already implemented in OpenCV via the ... perimeter of the contour (Line 11), followed by constructing the actual ... In today's post blog, we learned how to perform shape detection with OpenCV and Python. ... It recognizes the frame of image as a rectangle and none of the ...

OpenCV-Python教程(11、轮廓检测)_sunny2038的专栏-CSDN博客

https://blog.csdn.net/sunny2038/article/details/12889059

2013年10月30日 ... ... 的不同之处。这篇文章介绍在Python中使用OpenCV的检测并绘制轮廓。 ... 其中 thickness表明轮廓线的宽度,如果是-1(cv2.FILLED),则为 ...

opencv python 轮廓特征/凸包/外接矩形/外接圆/拟合矩形/拟合直线/拟 ...

https://segmentfault.com/a/1190000015663722

2018年7月17日 ... 第二个参数epsilon,它是从轮廓到近似轮廓的最大距离.第三个参数指定曲线是否 闭合. 下面,在第二幅图像中,绿线表示epsilon =弧长的10%的 ...

Python Opencv实现图像轮廓识别功能_python_脚本之家

https://www.jb51.net/article/160484.htm

2019年4月29日 ... 这篇文章主要为大家详细介绍了Python Opencv实现图像轮廓识别功能,文中示例 代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们 ...

OpenCV for detecting Edges, lines and shapes

https://hub.packtpub.com/opencv-detecting-edges-lines-shapes/

Sep 17, 2015 ... In this article, Joe Minichino, author of Learning OpenCV 3 Computer Vision with Python, 2nd Edition, discusses detecting edges, lines and shapes. ... We, as humans, can easily recognize many object types and their positons just ... Another vital task in computer vision is contour detection, not only because ...

Recognizing digits with OpenCV and Python - PyImageSearch

https://www.pyimagesearch.com/2017/02/13/recognizing-digits-with-opencv-and-python/

Feb 13, 2017 ... Learn how to recognize digits in images using OpenCV, Python, and ... Given an input edge map I can find contours and look for outlines with a ...

python下使用cv2.drawContours填充轮廓颜色- 云+社区- 腾讯云

https://cloud.tencent.com/developer/article/1016690

2018年1月8日 ... (2)画轮廓线时:就没必要搞list了,直接contours[i]就可以。 python代码:. 图片 :背景为黑色,有很多白色填充的。 下面代码是去除图片中自 ...

第五节、轮廓检测、直线和圆、多边形检测- 大奥特曼打小怪兽- 博客园

https://www.cnblogs.com/zyly/p/9327425.html

2018年7月18日 ...轮廓检测在计算机视觉中,轮廓检测是另一个比较重要的任务,不单是用来检测 图像或者 ... opencv中提供findContours()函数来寻找图像中物体的轮廓,并 ... [2] Pythonopencv使用笔记(十一)(详解hough变换检测直线与圆) ... 第十九节、 基于传统图像处理的目标检测与识别(HOG+SVM附代码)(29174) ...

Draw Contours in opencv around recognized polygon - Stack Overflow

https://stackoverflow.com/questions/34961349/draw-contours-in-opencv-around-recognized-polygon

You can use drawContours() function: cv2.drawContours(img, contours, -1, (0, 255,0), 3). The documentation explains it well:.

How to recognize and fix broken lines in table recognition | by ...

https://towardsdatascience.com/how-to-recognize-and-fix-broken-lines-in-table-recognition-1a19f22d59f2

Repair holes and missing contours of your table using OpenCV / Python · # Retrieve contours contours, hierarchy = cv2. · #Create separate lists for all values heights ...

OpenCV - How to find rectangle contour of a rectangle with round ...

https://stackoverflow.com/questions/46486078/opencv-how-to-find-rectangle-contour-of-a-rectangle-with-round-corner

I'm using Python 2.7.13 and OpenCV 2.4.13.3 . I've been thinking to extend these lines and get intersection points of lines. Finally, I ...

9 OpenCV tutorials to detect and recognize hand gestures | Into ...

https://www.intorobotics.com/9-opencv-tutorials-hand-gesture-detection-recognition/

9 OpenCV tutorials to detect and recognize hand gestures ... Hand gesture using OpenCV – using OpenCV 2.4, in this tutorial you can find line by line the code and ... OpenCV Python hand gesture recognition – tutorial based on OpenCV ... how to find the contour, how to draw the convex hull, and finally how to find the ...

How to complete/close a contour in python opencv? - Stack Overflow

https://stackoverflow.com/questions/43009923/how-to-complete-close-a-contour-in-python-opencv

As I mentioned in my comment to you answer, one of the easiest ways to " connect" the lines in the border is using morphological operators. In the following code, ...

Hand Gesture Recognition using Python and OpenCV - Part 2 ...

https://gogul09.github.io/software/hand-gesture-recognition-p2

Apr 25, 2017 ... Learn how to recognize hand gestures after applying background ... Line 26 finds the maximum contour in the image based on key cv2.