A webcam background changer that runs in your browser

Each frame from your camera goes to a segmentation model, which returns a low-resolution map of how confident it is that each part of the picture is a person. That map is the easy part. The hard part is the boundary: a mask barely a quarter of a megapixel, stretched over a 1280×720 frame, gives an edge that follows the model's rough idea of your outline rather than your actual outline — and the gap between the two is a rim of your real room, left visible around you like a halo.

So the mask is re-sampled using the camera frame itself as a guide, with neighbouring samples weighted by how closely their brightness matches the pixel being filled in. Samples from across a real edge in the picture contribute almost nothing, which pulls the boundary onto the edge that is genuinely there. Then the surviving rim pixels get a little of the new background's colour mixed in, so you look lit by the scene behind you instead of cut out and pasted on.

All of that happens on your graphics card, on every frame, before the frame reaches the recorder. It is also the reason the result depends on your room: the technique needs a visible edge to snap to, and a wall the same tone as your hair does not provide one.

It is not a virtual camera. Zoom, Teams, Meet and OBS cannot see the processed feed, because a browser tab has no way to register itself as a camera device with your operating system. This records video; it does not stand in for your webcam elsewhere.

It cannot rescue a badly lit room. The edge refinement finds real edges. If there is no contrast between you and the wall behind you, there is nothing for it to find, and you will see the mask wobble around your hair and shoulders.

It does not edit. There is no timeline, no trimming and no titles. You get a recording with the background already in it, which you can then take into any editor if you need more.