colab_webcam.py

from google.colab.output import eval_js
from base64 import b64decode

VIDEO_HTML = """
<video autoplay
 width=800 height=600></video>
<script>
var video = document.querySelector('video')
navigator.mediaDevices.getUserMedia({ video: true })
  .then(stream=> video.srcObject = stream)
  
var data = new Promise(resolve=>{
  video.onclick = ()=>{
    var canvas = document.createElement('canvas')
    var [w,h] = [video.offsetWidth, video.offsetHeight]
    canvas.width = w
    canvas.height = h
    canvas.getContext('2d')
          .drawImage(video, 0, 0, w, h)
    video.srcObject.getVideoTracks()[0].stop()
    video.replaceWith(canvas)
    resolve(canvas.toDataURL('image/jpeg', %f))
  }
})
</script>
"""
def take_photo(filename='photo.jpg', quality=0.8):
  display(HTML(VIDEO_HTML % quality))
  data = eval_js("data")
  binary = b64decode(data.split(',')[1])
  with open(filename, 'wb') as f:
    f.write(binary)
  return len(binary)