Selecting the camera resolution depends on the objective. Generally, an image can be captured with the goal of Detection, Identification, or Recognition. The more precise the required image, the higher the required camera resolution. Determining camera area coverage is also important. One camera can capture image on an entire room, but will not be able achieve individual facial recognition.
To determine the optimum positioning of the cameras, we consider field of view, viewing angle, blind spots and lighting conditions.
Field of view
Cameras can view a wide area or provide a high level of detail – but not both. A study from the FBU suggested that in order for a person’s face to be positively identified (for police and prosecution purposes) the person must equal about 120% of the vertical height of the video image. While some question this statistic, one thing is certain – using just a few cameras with large field of view will most certainly prevent identifying an intruder.
Intruder identification requires a fairly straight-line of their face. Often cameras are installed so high that they can only capture the top or side of the head. Cameras mounted at the door to capture a face upon entry will only capture the back of the head upon exit. By positioning the camera at the correct angle, facial recognition can be achieved on entry and exit.
Blind spots and lighting conditions
Considering physical obstructions and lighting changes (day and night) are critical to ensure video footage that can be viewed and reviewed while discerning as much detail about a subject as possible.
Once the requirements have been determined, we match those requirements to proven, high-quality cameras. Night Vision cameras are deployed in low-light or dark locations. Long Range cameras are ideally suited for mounting to building exteriors for large area monitoring. Pan Tilt Zoom (PTZ) cameras can be specified when the area is actively monitored and the operator needs to focus on a specific target (likely identified using motion sensing equipment).[/vc_column_text][/vc_column][/vc_row]