How to convert grayscale image to binary image in OpenCV

In this article, you’ll see how to convert a grayscale image to a binary image in OpenCV. I highly recommend you get the “Computer Vision: Models, Learning, and Inference Book” to learn Computer Vision. For converting a grayscale image to a binary image just follow these steps:

Step 1: Install OpenCV

If OpenCV is not installed, then first install it using this code.

pip install opencv-python

Step 2: Import the OpenCV library

import cv2

Step 3: Read the Grayscale Image

Now read the image from the location.

image = cv2.imread("C:\\AiHints\\gray_cat.jpg")

Step 4: Grayscale to Binary

Now, convert the grayscale image into binary.

thresh, binary = cv2.threshold(image, 150, 255, cv2.THRESH_BINARY)

Step 5: Output

Now, display the grayscale image and binary image.

cv2.imshow("Gray Image", image)
cv2.imshow("Binary Image", binary)

cv2.waitKey(0)
cv2.destroyAllWindows()

Output: