Why Resolution Alone Is Not Enough
Many projects reduce camera selection to "4 MP or 8 MP?" In reality, image usefulness is often determined by lens angle, scene depth, lighting, and target pixel density.
1. Define the Use Case First
At an entrance, facial identification may be required; around a warehouse perimeter, general situational awareness might be enough. The DORI model is useful here: detection, observation, recognition, and identification each require different pixel densities.
2. Balance Field of View and Detail
Wide-angle lenses cover more area but reduce pixels per target. Narrow lenses provide higher detail but smaller coverage. A frequent design mistake is expecting one camera to deliver both broad coverage and forensic detail.
3. Mounting Height Directly Affects Face Capture
When cameras are mounted too high, people are detectable but facial details degrade. At entrances, turnstiles, and checkout points, mounting height and view angle must be planned together.
4. Evaluate Low-Light Performance in Real Scenes
IR range, WDR behavior, and sensor size create major differences at night. Areas such as parking lots, loading zones, and perimeter walls should be tested after sunset before final decisions.
5. Map Pixel Density Before Deployment
Mark critical points on a site map and define expected image quality for each point. This leads to more rational lens selection and camera count planning.
Conclusion
Effective IP camera design starts with scenario definition, not a product list. When lens, angle, mounting height, and pixel density are planned together, fewer devices can deliver better operational outcomes.