Live Sketch Using Webcam in Python | Live Sketching Using OpenCV

What is a webcam?

A webcam is a video camera that feeds or streams an image or video in real-time to or through a computer network, such as the Internet. Webcams are typically small cameras that sit on a desk, attach to a user's monitor, or are built into the hardware(such as a laptop's front camera). Webcams can be used during a video chat session involving two or more people, with conversations that include live audio and video.

In this post, we will use this webcam to convert any live video to a sketch with the help of OpenCV using python so let's drive into the code

First import the required libraries

import cv2
import numpy as np

The function for sketching

# Our sketch generating function
def sketch(image):
    # Convert image to grayscale
    img_gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    
    # Clean up image using Guassian Blur
    img_gray_blur = cv2.GaussianBlur(img_gray, (5,5), 0)
    
    # Extract edges
    canny_edges = cv2.Canny(img_gray_blur, 10, 70)
    
    # Do an invert binarize the image 
    ret, mask = cv2.threshold(canny_edges, 70, 255, cv2.THRESH_BINARY_INV)
    return mask

The video loop

# Initialize webcam, cap is the object provided by VideoCapture
# It contains a boolean indicating if it was sucessful (ret)
# It also contains the images collected from the webcam (frame)
cap = cv2.VideoCapture(0)

while True:
    ret, frame = cap.read()
    cv2.imshow('Our Live Sketcher', sketch(frame))
    if cv2.waitKey(1) == 13: #13 is the Enter Key
        break

To release the camera:

# Release camera and close windows
cap.release()
cv2.destroyAllWindows()  

Github:

You can also get the code here

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