Delivery Contents / Technical Data
PHYTEC Messtechnik GmbH 2008 L-720e_0
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5.1
The parallel image processing
The demo program does not supported the parallel image processing,
but it is possibility to open the program several times. If you use a
pciGrabber-4x4 variant with four decoder you can start the demo
program four times.
First the settings in the menu
Basic Settings
must be set. It is
important to allocate every demo program one decoder. If two
programs have the same decoder it is possible that they work
incorrect.
After that you must select the channel under
Image Settings
. Finally
the
Live Image
can be started.
The following should be noted! The pciGrabber-4x4 uses a PCI
Express-to-PCI-Bridge. This means that all video decoder operates
together on a PCI bus. The PCI bus works only on the grabber card.
Through the bridge the PCI bus is linked to the PCI Express bus. The
PCI Express bus works with 1250 MHz and is able to transmit about
250 MB/s. The PCI bus works with 33 MHz. So it is possible to
transmit 132 MB/s. So the PCI bus limits the data volume. At a
digitizing of one decoder the data volume represents 44 MB/s.
•
The calculation of the maximum data volume per one decoder
results (PAL):
Image size (max): 768 x 576
Numbers of bytes per pixel(RGB32): 4
Numbers of pictures pro second: 25
Numbers of decoders: 1
s
MByte
decoders
s
pictures
pixel
byte
size
=
⋅
⋅
⋅
equation 1
s
MByte
s
Byte
2368
.
44
1
25
4
576
768
=
⋅
⋅
⋅
Are four decoders used simultaneously, increasing the volume of data
by a factor of four to 176.9 MB/s
s
MByte
s
Byte
9
.
176
4
1
25
4
576
768
=
⋅
⋅
⋅
⋅
