What is a network camera?
network camera can be described as a camera and computer combined
into one unit. It connects directly to the network as any other
network device. A network camera has its own IP address and built-in
computing functions to handle network communication.
needed for viewing images over the network is built into the unit.
A network camera has built-in software for a Web server, FTP server,
FTP client and e-mail client. Other features include alarm input
and relay output functions. More advanced network cameras can
also be equipped with many other value-added options such as motion
detection and an analog video output.
network camera's camera component captures the image -- which
can be described as light of different wavelengths -- and transforms
it into electrical signals. These signals are then converted from
analog to digital format and transferred into the computer function
where the image is compressed and sent out over the network.
lens of the camera
focuses the image onto the image
sensor (CCD). Before reaching the image sensor,
the images pass through the optical
filter, which removes any infrared light so that
the "correct" colors will be displayed. The image sensor
converts the image, which is composed of light information, into
electrical signals. These electrical, digital signals are now
in a format that can be compressed and transferred over networks.
ARTPEC processor chip
performs such camera controller functions as managing the exposure
(light level of image), white balance (adjusts the color levels),
image sharpness and other aspects of image quality. ARTPEC also
includes a video compression component, which compresses the digital
image into an image containing less data for efficient transfer
over the network.
camera's Ethernet connection is enabled by the ETRAX
chip -- an optimized system-on-chip solution for connecting peripherals
to the network. The ETRAX includes a 32-bit CPU, 10/100 MBit Ethernet
connectivity, advanced Direct Memory Access (DMA) functionality
and a wide range of I/O interfaces.
CPU, Flash memory and DRAM memory
represent the "brains" or computing functions of the
camera and are designed specifically for network applications.
Together, they handle the communication with the network and the