Learn more about high-definition (HD) technology and how it enables today’s IP cameras to capture exceptional image detail and at least three times more data per camera than traditional CCTV cameras.
When to Choose High Definition IP Cameras for Video Surveillance
Demanding More Detail
The leading driver for the adoption of IP-based surveillance systems is the support for high definition cameras. High Definition (HD) IP cameras integrate with existing network infrastructure and allow you to capture at least three times more data per camera than traditional CCTV cameras. With their support for multi-megapixel resolutions and higher frame rates, HD cameras provide exceptional image detail and extended field of vision.
Where Would I Use HD Cameras?
Standard Definition (SD) cameras are adequate for many surveillance applications where a general overview is all that’s required. But high security situations that demand greater detail or clearer images of moving objects call for HD cameras. For example, it may be adequate to use an SD camera to monitor the foot traffic at an entrance to a store where personal identification is not a requirement. In the same store, an HD camera might be installed at the point of sale to capture detailed transactional information (credit card type, products purchased) as well as customer and salesperson detail (hair colour, facial details, jewellery, clothing, and any suspicious movements).
Understanding High Definition and Megapixel Resolutions
The adoption of HDTV for broadcast television has dramatically impacted video surveillance technology. Customers are calling for clearer video, more vibrant colours and smoother motion capture. To meet these demands, camera manufacturers are producing megapixel cameras capable of capturing high-resolution images (1280 x 720 and higher).
“Megapixel” is not an industry standard. Rather, it describes the number of image sensor elements in a digital camera. These high-resolution cameras produce an enormous amount of data, which can compromise frame rate and degrade overall image quality.
It is easiest to understand how resolution affects what you see onscreen by looking at the figure below. VGA resolution is 640 x 480 pixels (the smallest box in Fig. 1). Today, most monitors support 1280 x1024 (SXGA, shown in red in Fig. 1) or greater resolutions, which will display images captured by a megapixel or multi-megapixel HD camera.
D-Link’s HD cameras support the following resolution and compression standards
HD/megapixel cameras provide the ideal solution to security situations where detailed vision is critical. They are complementary to SD cameras, sharing network resources and management software.