Access Webcam Video from a hosted Streamlit application

[Spidy20]

Now, we can access the webcam using Streamlit. Thanks to the streamlit-webrtc. Just install this module

pip install streamlit-webrtc

Now, we can access the webcam using this module, let’s see with example

import cv2
from streamlit_webrtc import VideoTransformerBase, webrtc_streamer

faceCascade = cv2.CascadeClassifier(cv2.haarcascades+'haarcascade_frontalface_default.xml')


class VideoTransformer(VideoTransformerBase):
    def __init__(self):
        self.i = 0

    def transform(self, frame):
        img = frame.to_ndarray(format="bgr24")
        gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
        faces = faceCascade.detectMultiScale(gray, 1.3, 5)
        i =self.i+1
        for (x, y, w, h) in faces:
            cv2.rectangle(img, (x, y), (x + w, y + h), (95, 207, 30), 3)
            cv2.rectangle(img, (x, y - 40), (x + w, y), (95, 207, 30), -1)
            cv2.putText(img, 'F-' + str(i), (x, y - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.8, (0, 0, 0), 2)

        return img

webrtc_streamer(key="example", video_transformer_factory=VideoTransformer)

You can see app screenshot below