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I am using navigator.getUserMedia with constraints to access the user's webcam, using the feed as the source of an HTML <video> and then copying its stream to drawImage a <canvas> context. I'm doing all this so I can take a snapshot at intervals.

What I would like to do is, once the page starts taking snapshots, lock the getUserMedia camera's focus/exposure, so that in between snapshot intervals the environment can change without the light balance changing or the camera refocusing.

Does anyone know if this is possible on the JS side?

I am using navigator.getUserMedia with constraints to access the user's webcam, using the feed as the source of an HTML <video> and then copying its stream to drawImage a <canvas> context. I'm doing all this so I can take a snapshot at intervals.

What I would like to do is, once the page starts taking snapshots, lock the getUserMedia camera's focus/exposure, so that in between snapshot intervals the environment can change without the light balance changing or the camera refocusing.

Does anyone know if this is possible on the JS side?

  • javascript
  • canvas
  • camera
  • html5-video
  • getusermedia
Share Improve this question asked Mar 29, 2015 at 1:12 Jody HeavenerJody Heavener 2,8745 gold badges44 silver badges72 bronze badges 6
  • 7 Not yet. Unfortunately, WebRTC does not allow photo-level access to cameras, but a new Image Capture spec is being worked on to solve this. None of the browsers implement it yet though. – jib Commented Apr 6, 2015 at 0:36
  • 1 Chrome Beta 56 does ship with a first draft of the Image Capture API. See the release info: androidpolice./2016/12/14/… – geekonaut Commented Dec 21, 2016 at 20:56
  • Look at this example : jsfiddle/zlatnaspirala/u2f9wbzh , ok this is not webrtc . It is possible 100%. Look at webrtc-experiment. (recording , capture etc...) – Nikola Lukic Commented Feb 17, 2017 at 8:21
  • Possible duplicate of Take photo when the camera is automatically focused – Marcus Commented Sep 15, 2019 at 6:25
  • @Marcus this question is years older but

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