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Make your Sketch using OpenCV in Python – simplest way – easy project – 2024

In today’s very short blog we will see that how we can make our sketch using OpenCV in the simplest way possible. This is going to be a very fun project for beginners. So without any further due, Let’s do it…

Table of Contents

Code for making a sketch using OpenCV…

import cv2
import numpy as np

def sketch(image):
    gray = cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)
    blur_gray = cv2.GaussianBlur(gray,(5,5),900)
    edges = cv2.Canny(blur_gray,45,90)
    ret,thre = cv2.threshold(edges,70,255,cv2.THRESH_BINARY_INV)
    return thre

cam = cv2.VideoCapture(0)

while 1:
    ret,frame = cam.read()
    cv2.imshow('Live Sketch', sketch(frame))
    if cv2.waitKey(1)==27:
        break
    if cv2.waitKey(1)==13:
        cv2.imwrite('sketch.jpg',sketch(frame))
        print('Image Saved!!!')

cam.release()
cv2.destroyAllWindows()

Line 1-2 – Importing required libraries.
Line 4-9 – Defining the sketch function. We will use this function to implement sketch using OpenCV.
- Line 5 – Convert the image from BGR to gray.
- Line 6 – Gaussian Blur the image, to remove Gaussian Noise.
- Line 7 – Find edges in the image using Canny Edge Detection.
- Line 8 – Threshold the image, to convert it to a binary image (just 0 and 255 pixels).
- Line 9 – Return the thresholded image.
Line 11 – Instantiate the camera using cv2.VideoCapture(0). Here 0 means that it will use a webcam.
Line 13 – Let’s start the loop.
Line 14 – Read the image/frame from the camera.
Line 15 – Show the sketch image returned by the sketch function when the current frame is passed into it.
Line 16-17 – If someone hits the ESC key, break the code.
Line 18-20 – If someone hits ENTER key, save the sketch.
Line 22-23 – Close the webcam and destroy all open windows.