3 ms·
Hmm, given camera is on top, computing homography and rectifying the perspective image would give fairly good precision around the camera, falling off quickly w
by bitL 7y ago
Hmm, given camera is on top, computing homography and rectifying the perspective image would give fairly good precision around the camera, falling off quickly with distance, likely not being very useful at the bottom of the screen. Also, it's likely sensitive to both ambient light and the dominant light on the screen, in dark rooms with dark themes it might be pretty off, as most computer vision algorithms need constant tuning for changing conditions.
- mbreese 7y agoMaybe you could add an IR LED that could be observed by the webcam, but not in the visible spectrum. I’m not sure if the MacBook webcam includes an IR filter or not. It wouldn't help the precision, but might make the camera less susceptible to changes in ambient light.
- tigershark 7y agoEven 5$ webcam include a IR filter, the image quality without is pretty awful, so I’m pretty sure that apple webcams have it.
- kevinsundar 7y agoI recently shined a remote control into my late 2013 macbook pro's camera and I totally saw the ir light. Not saying that you're wrong, I don't know if there are filters but only for certain specific wavelengths or something like that.
- mkl 7y agoRemote controls are pretty bright IR, so it could be just that it only blocks up to a certain brightness.
- kevinsundar 7y agoMakes sense. Direct IR light is probably harder to block.
- tigershark 7y agoEven in my webcam before removing the IR filter I could see the faint remote light if pointing directly at it. After removing the ir filter I could literally see in a room without lights just lit by the remote.
- tomp 7y agoCoul use a mirror “broken” in half to get stereo vision maybe.