Mastering OpenCV 4 with Python

Drawing lines

The first function we are going to see is cv2.line(). The signature is as follows:

img = line(img, pt1, pt2, color, thickness=1, lineType=8, shift=0)

This function draws a line on the img image connecting pt1 and pt2:

cv2.line(image, (0, 0), (400, 400), colors['green'], 3)cv2.line(image, (0, 400), (400, 0), colors['blue'], 10)cv2.line(image, (200, 0), (200, 400), colors['red'], 3)cv2.line(image, (0, 200), (400, 200), colors['yellow'], 10)

After coding these lines, we call the show_with_matplotlib(image, 'cv2.line()') function. The result is shown in the next screenshot: