9. CONFIGURATION
performs an update of the extrinsic parameters, as they are signicantly more
prone to variations. More specically, only the rotation between the cameras
is estimated. This is usually the most fragile parameter, which can be aected
signicantly by even minor deformations of the camera mount.
Auto re-calibration can be activated by selecting the `enable auto re-cal-
ibration' option. SceneScan will then continuously compute samples for the
estimated inter-camera rotation. A robust estimation method is applied for
selecting a nal rotation estimate from the set of rotation samples. The num-
ber of samples that are used for this estimation process can be congured.
Small sample sizes allow for a quick reaction on alignment variations, while
large sample sizes allow for very accurate estimates. If the `permanently save
corrected calibration' option is selected, then the updated calibration is written
to non-volatile memory and remains present even after a power cycle.
In the statistics area you can nd various information on the current per-
formance of the auto calibration process. This includes the status of the latest
re-calibration attempt, the time since the last calibration update, the rota-
tional oset of the last update and the number of rotation samples that have
been collected and discarded since the last update. Finally, you can nd a list
of recently computed inter-camera rotations in the history area. The listed
rotations are represented as rotation quaternions.
9.12 Network Settings
The `network settings' page, which is displayed in Figure 26, is used for con-
guring all network related parameters. In the `IP settings' section, you can
specify an IP address, subnet mask and gateway address. When changing
the IP settings, please make sure that your computer is in the same subnet,
or that there exists a gateway router through which data can be transferred
between both subnets. Otherwise you will not be able to access the web in-
terface anymore and you might be forced to perform a conguration reset (see
Section 6.4).
In the `network protocol' section, you can choose the underlying network
protocol that shall be used for delivering the computation results to the client
computer. The possible options are TCP and UDP. Due to the high-bandwidth
real time data we recommend using UDP, unless the input images are trans-
ferred through ethernet, as described in Section 7.6.
In order to obtain the best possible performance, jumbo frames support
should be activated in the `jumbo frames' section. Before doing so, however,
you must make sure that jumbo frames support is also enabled for your client
computer's network interface. Details on how to enable jumbo frame support
on your computer can be found in Section 7.2 on page 10.
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