3 ms·
It comes down to physics. Cameras and their lenses come in all shapes and sizes, most of webcams don't expose their geometry in a programmatically accessible wa
by notum 5y ago
It comes down to physics. Cameras and their lenses come in all shapes and sizes, most of webcams don't expose their geometry in a programmatically accessible way, even if they did, most of them don's have means of determining distance to the subject.
We can detect faces, eyes and pupils, but with no reference points we have no idea how big or far apart they are.
- gregsadetsky 5y agoThanks! What about sites (such as Warby Parker) that make you hold up a credit card (which has a standard size) and use that to determine (via what I assume is a rule of three) the PD? [0] I can see of course problems with the card not being “perpendicular” and other 3d distortions. [0] - https://www.warbyparker.com/pd/instructions https://www.warbyparker.com/pd/instructions