Implement Color Detection with Example in Python OpenCV

In this tutorial, we will use an example to show you how to detect a color from an image in python opencv.

We will detect the green color in this example.

1.Read an image

import cv2
import numpy as np
img = cv2.imread("pydetect.png")

2.Convert rgb image to hsv

hsv_img = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)

Here is an detailed tutorial:

3.Create a NumPy array for the lower green values and the upper green values

lower_green = np.array([34, 177, 76])
upper_green = np.array([255, 255, 255])

4.Use cv2.inRange() to get color mask

masking = cv2.inRange(hsv_img, lower_green, upper_green)

5.Get the masked image

cv2.imshow("Green Color detection", masking)
cv2.waitKey(0)

If you want to save the resultant image, you can refer this tutorial:

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