Balluff MATRIX VISION mvBlueNAOS, Техническое руководство

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1.17 Glossary 115
GigE Vision
GigE Vision is a network protocol designed for the
communication between an imaging device and an application. This proto-
col completely
describes:
• device discovery
• data transmission
– image data
– additional data
• read/write of parameters.
GigE Vision uses UDP for data transmission to reduce overhead in-
troduced by TCP.
Note
UDP does not guarantee the order in which packets
reach the client nor
does it guarantee that packets arrive at the client at all.
However,
GigE Vision defines mechanisms that can detect lost
packets.
This allows capture driver manufacturers to implement
algorithms
that can reconstruct images and other data by requesting
the device to
resend lost data packets until the complete buffer has
been assembled. For further information please have a
look at
https://en.wikipedia.org/wiki/GigE_
← -
Vision
The MATRIX VISION GigE Vision capture filter driver as
well as the socket based
acquisition driver and all MATRIX VISION GigE Vision
compliant devices support
resending thus lost data can be detected and in most
cases reconstructed. This
of course can not enhance the max. bandwidth of the
transmission line thus if
e.g. parts of the transmission line are overloaded for a
longer period of time
data will be lost anyway.
Both capture drivers will allow to fine tune the resend algorithm used
internally
and both drivers will also provide information about the amount of
data lost and
the amount of data that was re-requested.
This informa-
tion/configuration will be
part of the drivers SDK. More information about it can be found in
the
corresponding interface description.
Note
On Windows 2000 the filter driver does not support the "
←
-
Resend"
mechanism.
MATRIX VISION GmbH