OpenCV 3 Computer Vision with Python Cookbook

How it works...

First, cv2.circle gives the thinnest and darkest blue primitive. The second invocation draws a dark blue point. The third call produces a lighter blue circle with sharp edges. The last call, cv2.circle, reveals the lightest blue circle with smooth borders.

The cv2.circle function takes the image as first parameter, and the position of center in (x, y) format, radius of the circle, and the color as mandatory arguments. Also you can specify line thickness (the FILLED value gives a filled circle) and line type (LINE_AA gives aliasing-free borders).

The cv2.line function takes an image, start and end points, and color of the image (as in first call). Optionally you can pass line thickness and line type (again, to suppress aliasing). ...