Video Receiver
Must Know
Must Know
Technical Zone
Must Know
P-iris
Many VIVOTEK camera models are able to transmit 2-Megapixel video at 30 fps with H.264 compression, compared with many
conventional megapixel camera which achieve only 10-15 fps. The ability to view and record footage at full frame rate allows for
increased effectiveness in surveillance.
Compatible with the HDTV (16:9) standard, Full HD network cameras provide surveillance coverage for an area up to six times
larger than possible with a VGA camera, significantly reducing the number of cameras required. They are especially well suited to
monitor broad spaces such as building entrances, airport terminals, and parking lots. In addition, it is excellent for applications
requiring accurate recognition for post-content analysis, such as the identification of people or license plates.
Full HD
Technical Zone
Must Know
IP surveillance relies on video compression to reduce requirements for transmission bandwidth and storage space. The main
stream compression standards widely used in network cameras are MJPEG, MPEG-4, and H.264. MJPEG is the most popular
compression standard for still images. MPEG-4, on the other hand, finds the differences from a reference key frame, leaves out
redundant information, and compresses only frame-to-frame differences, significantly reducing file size and bandwidth usage.
Similar to MPEG-4, H.264 provides a more efficient method of compression with more precise use of motion search and prediction.
Though H.264 requires more powerful CPU specifications, it has a higher compression ratio than MPEG-4. VIVOTEK network
cameras are one of the few on the market that provide for triple-codec compression using all three standards, allowing users a
greater degree of freedom and flexibility.
JPEG, MPEG-4, and H.264
When a camera is used in a high contrast, backlight, glare, or light reflective environment such as a building entrance, ATM, or
window, a subject may appear dark and unrecognizable. WDR (Wide Dynamic Range) Technology can ensure an identifiable image
of the subject under such conditions by appropriately exposing the entire scene at both the darkest and brightest parts. By
combining these two images, a more detailed, recognizable image can be used for security review.
The advanced P-Iris lens controls the iris opening with extreme precision at an optimal level at all times via the built-in stepper motor,
resulting in superior sharpness and depth of field as well as image quality.
The key components of VIVOTEK Smart Focus System include Focus Assist Button and Remote Focus. To make installation and
adjustment easier for the integrator, VIVOTEK has adopted lens with a built-in stepping motors to remotely control the focal length
and focus, eliminating the need to be at the physical location of the camera. The other component of the Smart Focus system,
Focus Assist, can aid an installer in precisely adjusting focus on a camera. When the Focus Assist button is pressed on the camera
unit, an indicator will be displayed on-screen with a focus indicator which varies in accordance with the manual adjustment. Holding
down the button will zoom in on the target area for fine tuning, resulting in better usability and picture clarity. In addition, by utilizing
the included stepping-motor lens with Remote Focus functionality, a user can also easily zoom in on a target area and make
adjustments from a remote site, offering more flexible, hassle-free installation and maintenance.
WDR (Wide Dynamic Range)
Smart Focus System
Compressed file size
Bandwidth comparison ratio
Encoding CPU loading ratio
Application
MJPEG MPEG-4 H.264
20%
20
1
: :
: :
2%
2
4
1%
1
10
Moving picture viewing
Real-time transmission
Snapshot viewing
Local storage
640X480
(VGA)
720X480
(D1)
1280X720
(720p)
1920X1080
(1080p)
1920X1080
(1080p)
640X480
(VGA)
1
1
2
5
6
2 3
4
5 6
Benefits:
• Configurable iris
• Applicable depth of field
• Optimal image quality
P-iris Lens Conventional Lens
With WDR Enhancement Without WDR Enhancement
23 24