Assessing existing cameras for people positioning starts with video access, stable installation, ground coverage and visible people. This is a proposed implementation method. Compatibility with the existing devices has not been verified here. No new deployment is reported.
Collect video and site information first
List camera models, encoding, resolution, time sources, installation positions, representative video and the site map. Mark occlusion, blind areas, overlapping views and ground-level changes. Confirm video access, image and track purposes, authorized viewers and retention separately. The presence of installed cameras is not evidence that these conditions have been confirmed.
Establish evidence by stage
| Stage | Proposed work | Evidence before proceeding |
|---|---|---|
| Video access | Check stream access, frame acquisition and reconnection | Original frames, sources and status records |
| Site map and calibration | Define coordinates and check ground mappings | Corresponding points, independent check points and valid areas |
| Single-camera observations | Check person visibility and tracking | Occlusion and interruption sample results |
| Cross-camera association | Check handovers, crossings and reappearance | Original observations associated with result states |
| Outputs and interfaces | Define positions, trajectories and agreed events separately | Field definitions, time meanings and fault-state tests |
Match coordinate models to the physical site
See OpenCV homography documentation for planar mapping mechanisms. Check fitted mappings independently. A point displayed on a map does not establish valid calibration. Recheck affected calibration after changes to camera position, lenses or image crops. Mark estimated coordinates in outputs and displays. Do not present them as verified position accuracy.
Define identity and historical functions separately
Preserve observation sources and unknown states in trajectory association. For named identity, separately confirm identity data and verification procedures. For historical search or area alerts, separately test storage, queries, rules and interfaces. Live trajectory lines do not establish accepted historical search. A visible face image does not establish a completed identity-database comparison.
Retest under agreed conditions
Choose a representative area and record person counts, routes, lighting, occlusion and target workload. Check position error, association errors, trajectory interruptions and response time separately. Deliver configurations, original evidence and unfinished items. This design makes no promise of direct reuse for arbitrary surveillance cameras. It adds no verified positioning-accuracy or continuous-operation acceptance result.
Related services: Multi-camera synchronization, calibration and fusion, project consultation.