OpenCV basics continued...Draw Texts

OpenCV provides functions not only for drawing shapes, but also for texts. cv2.putText() function is used for drawing texts.

Similarly, define a wrapper function draw_text():

1 def draw_text(image, text, org,

2 font_face=cv2.FONT_HERSHEY_COMPLEX, 

3 font_scale=1,

4 color=(255,255,255),

5 thickness=1,

6 line_type=cv2.LINE_AA):

7 cv2.putText(image, text, org, font_face,

8 font_scale, color, thickness, line_type )

Then create a canvas, paint it with light gray color, then call draw_ text() function to draw the texts.

10 canvas = np.zeros((380, 480, 3), np.uint8)

11 canvas[:] = 235,235,235

12 #Draw a text

13 draw_text(canvas, "Hello OpenCV", (50, 100),

14 color=(125, 0, 0),

15 font_scale=1.5,

16 thickness=2)

17 cv2.imshow("Hello OpenCV", canvas)

18 cv2.waitKey(0)

19 cv2.destroyAllWindows()

The result is shown as Figure shown below-

This version of OpenCV supports a limited set of fonts, below table shows the supported fonts.