The grabFrame() method of the ImageCapture interface takes a snapshot of the live video in a MediaStreamTrack and returns a Promise that resolves with a ImageBitmap containing the snapshot.
ImageCapture.grabFrame()
Syntax
grabFrame()
Return value
A Promise that resolves to an ImageBitmap object.
Examples
This example is extracted from this Simple Image Capture demo. It shows how to use the Promise returned by grabFrame() to copy the returned frame to a <canvas> element. For simplicity it does not show how to instantiate the ImageCapture object.
var grabFrameButton = document.querySelector('button#grabFrame'); var canvas = document.querySelector('canvas'); grabFrameButton.onclick = grabFrame; function grabFrame() { imageCapture.grabFrame() .then(function(imageBitmap) { console.log('Grabbed frame:', imageBitmap); canvas.width = imageBitmap.width; canvas.height = imageBitmap.height; canvas.getContext('2d').drawImage(imageBitmap, 0, 0); canvas.classList.remove('hidden'); }) .catch(function(error) { console.log('grabFrame() error: ', error); }); }
Specifications
| Specification |
|---|
| MediaStream Image Capture # dom-imagecapture-grabframe |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
grabFrame |
59
|
79
|
No
See
bug 888177.
|
No
|
46
|
No
|
59
|
59
|
No
See
bug 888177.
|
43
|
No
|
7.0
|
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ImageCapture/grabFrame
