3 ms·
Most cameras have an IR filter so that won't work. In the past, phone cameras often didn't have an IR filter.
by nalllar 10y ago
Most cameras have an IR filter so that won't work.
In the past, phone cameras often didn't have an IR filter.
- Natanael_L 10y agoNear-red IR is hard to filter without also accidentally making red colors look off, because getting the frequency response perfectly match human eyes is extremely hard. You don't want to detect less, and detecting just a bit more usually won't hurt.