matplotlib example webcam face detect2 (snippet)

Python matplotlib example 'webcam face detect2'

Modules used in program:

import matplotlib.pyplot as plt
import numpy as np
import cv2
import sys

python webcam face detect2

Python matplotlib example: webcam face detect2

#!/usr/bin/python

import sys
import cv2
import numpy as np
import matplotlib.pyplot as plt


cascasdepath = "haarcascade_frontalface_default.xml"

if len(sys.argv) < 2:
    video_capture = cv2.VideoCapture(0)
else:
    video_capture = cv2.VideoCapture(sys.argv[1])

while True:
    ret, image = video_capture.read()

    if not ret:
        break

    gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

    face_cascade = cv2.CascadeClassifier(cascasdepath)

    faces = face_cascade.detectMultiScale(
        gray,
        scaleFactor = 1.2,
        minNeighbors = 5,
        minSize = (30,30)

        )

    #print("The number of faces found = ", len(faces))

    for (x,y,w,h) in faces:
        cv2.rectangle(image, (x,y), (x+h, y+h), (0, 255, 0), 2)

    # Here are some alternatives if displaying with cv2 isn't working
    #
    #cv2.imshow("Faces found", image)    
    #
    # 1) Instead of showing the image with cv2, we will save it

    cv2.imwrite('webcam_face_detect2.png', image)

    # 2) Use pyplot to show the image.  Just uncomment these lines:
    #
    #plt.imshow(image)
    #plt.show()

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

video_capture.release()
# cv2.destroyAllWindows()

Python links

Learn Python: https://pythonbasics.org/
Python Tutorial: https://pythonprogramminglanguage.com