CCTV Security Camera News in Da Nang Vietnam

PTZ in a Megapixel World


It was heard in many security related market discussions over the past 3-4 years that the era of the PTZ (Pan Tilt Zoom camera) was over.  Megapixel technology would allow the digital zoom and detail in video that would make the mechanical PTZ obsolete. After all, fixed megapixel cameras are a fraction of the cost of mechanical PTZ, often with greater resolution.  And with enough of them covering the viewing scene, these fixed cameras would resolve the main issue with mechanical PTZ, which is when it looks in one direction, it misses the action elsewhere.

If that wasn’t bad enough for the mechanical stalwart of the analog era, along comes the emergence of high-megapixel fisheye cameras that can dewarp the curved view and digitally PTZ around a 360 degree view. Now, with one camera, a security professional can see the entire field of view in real time and in the recorded video.  Wow, how could a higher cost device that can’t look in all directions at once compete with that?

However, as IP camera manufacturers improve their megapixel fixed camera offering, and as they push dewarped fisheye technology to 5 megapixels, so too do they release HD PTZ cameras with longer mechanical zoom and faster rotational speeds. Is it that old habits die hard, or is there a market for these cameras that can’t be served by the fixed newcomer technology?

The answer lies in the evolution of resolution from analog to IP and the actual customer needs.  Mechanical PTZ cameras rose in popularity at a time when analog resolution was too low to meet much of the need. With mechanical zoom, that resolution shortfall was overcome. And that is what many people think of when they imagine megapixel fixed technology overtaking the mechanical. However, there are several uses that the fixed technology has yet to address, and are driving not only the continued use and investment in PTZ, but innovation as well.

For security professionals that engage in active surveillance and need to see the detail of activity at distances greater than roughly 30 feet, the mechanical PTZ still is the weapon of choice. While the recent economic downturn has reduced the investment in active surveillance, it is still a core activity in the gaming and higher end retail verticals. The dewarped 3 and 5 megapixel fisheye cameras can zoom in for evidentiary detail of theft to about 30 feet from a camera (depending on the height). But a 1080p PTZ with 20x mechanical zoom can achieve this at 350 ft.

If one stands in a control room of a casino or retail Loss Prevention station, and watches the officerstrack, zoom, and move with targets as they investigate in real time, it is evident that while many of the prior uses for PTZ have been consumed by less expensive technology, PTZ is the only tool that can meet the needs of these video power users.