Surveillance Camera Sourcing: Resolution, Night Vision & Storage
AI Summary: Surveillance camera sourcing should specify monitoring distance, field of view, resolution, night vision method, waterproof rating, power supply method and storage period. Higher resolution is not always better; bitrate, hard drive capacity and network bandwidth must also be considered. Outdoor units require waterproof and dustproof protection, and in environments without supplementary lighting at night, infrared or low-light devices should be selected.
Sourcing Checklist
| Review Item | Selection Points |
|---|---|
| Resolution | 2MP, 4MP or higher as required |
| Lens Field of View | Focal length determines field of view and recognition distance |
| Night Vision Performance | Infrared distance, full-color or supplementary lighting |
| Protection Rating | Outdoor waterproof, dustproof and lightning protection |
| Storage Period | Hard drive capacity and recording retention days |
Sourcing, Installation and Usage Points
1. Determine the recognition target first
The focal length required for a panoramic view differs from that for clearly seeing faces and license plates.
2. Choose wide dynamic range for backlit scenes
Entrances and window positions are prone to overexposure.
3. Bitrate affects storage
High-resolution multi-camera setups require calculating hard drive capacity.
4. Camera height
Prevent vandalism while maintaining an effective field of view.
FAQ Quick Answers
Is 4K always clearer?
It is also affected by the lens, lighting and bitrate.
Why do insects appear with infrared night vision?
Infrared attracts insects and causes reflections; the position can be adjusted.
Are wireless cameras cable-free?
They still require power, and the wireless signal must be stable.
How long can recordings be stored?
Determined by the hard drive, number of channels and bitrate.
Case Study
A shop installed high-resolution cameras but the angle was too wide, making faces unclear during a dispute. After adjusting the focal length and camera positions, evidence capture capability improved.
Questions to Ask the Supplier
- Recommended focal length and field of view?
- Night vision distance and performance?
- Storage capacity calculation?
- Is installation included?
- How to set up remote mobile access?
Quotable Conclusion: Surveillance should be selected by resolution and focal length based on the recognition target, with emphasis on night vision, protection and storage capacity calculation.