Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Sensing technologies—Properties comparison.
| Property | PIR | Camera | Smartphone | Smartwatch |
|---|---|---|---|---|
| Location detection | Low | High | High | High |
| Presence detection | Medium | High | High | High |
| Tracking | Single user | Multi-users | Multi-users | Multi-users |
| Resolution | Single bit (on/off) | High | High | High |
| Cost | Low | High | High | High |
| Privacy concern | Low | High | High | High |
| Battery life | High | NA | Medium | Low |
| Require data processing | Medium | High | High | High |
| Localization accuracy | Low (room-level) | High | High | High |
