OpenCV is the huge open-source library for computer vision, machine learning, and image processing and now it plays a major role in real-time operation which is very important in today’s systems. By using it, one can process images and videos to identify objects, faces, or even the handwriting of a human. When it integrated with various libraries, such as Numpuy, python is capable of processing the OpenCV array structure for analysis.
Note: For more information, refer to OpenCV Python Tutorial
cv2.polylines() method is used to draw a polygon on any image.
Syntax: cv2.polylines(image, [pts], isClosed, color, thickness)
image: It is the image on which circle is to be drawn.
pts: Array of polygonal curves.
npts: Array of polygon vertex counters.
ncontours: Number of curves.
isClosed: Flag indicating whether the drawn polylines are closed or not. If they are closed, the function draws a line from the last vertex of each curve to its first
color: It is the color of polyline to be drawn. For BGR, we pass a tuple.
thickness: It is thickness of the polyline edges.
Return Value: It returns an image.
Image used for all the below examples:
- OpenCV - Facial Landmarks and Face Detection using dlib and OpenCV
- Transition from OpenCV 2 to OpenCV 3.x
- Real-Time Edge Detection using OpenCV in Python | Canny edge detection method
- Python Program to detect the edges of an image using OpenCV | Sobel edge detection method
- Line detection in python with OpenCV | Houghline method
- Python | Corner detection with Harris Corner Detection method using OpenCV
- Python | Corner Detection with Shi-Tomasi Corner Detection Method using OpenCV
- Python OpenCV | cv2.imread() method
- Python OpenCV | cv2.imshow() method
- Python OpenCV | cv2.imwrite() method
- Python OpenCV | cv2.line() method
- Python OpenCV | cv2.rectangle() method
- Python OpenCV | cv2.circle() method
- Python OpenCV | cv2.putText() method
- Python OpenCV | cv2.ellipse() method
- Python OpenCV | cv2.cvtColor() method
- Python OpenCV | cv2.copyMakeBorder() method
- Python OpenCV | cv2.arrowedLine() method
- Python OpenCV | cv2.blur() method
- Python OpenCV | cv2.erode() method
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