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6 Web Based Graphical User Interface (WebGUI)
The distance between the two slider points is the resulting video length, which is shown in the text field at
the end of the slider. Note that the video length is limited by the internal memory for capturing video frames
and may not be shorter than 2 seconds. Like all other settings, the change of the mode takes place upon
pressing the "Use" button.
6.6.8 Set triggering options
The last tab allows the user to set various trigger options. First, the external hardware trigger pin can be
selected within the dropdown. How this hardware trigger is handled can be chosen with the "Heartbeat
Trigger" switch to the right of the dropdown. When inactive, the regular trigger mode is used. This means
that a video is triggered whenever a high signal is received. When active, the signal is used as a heartbeat
and thus only when no signal is received for a set time a video is saved. The text on the right of the switch
always shows the currently active mode.
If the heartbeat trigger is set, the corresponding input field will be enabled. Here, the user can define a
timeout in milliseconds. So that time defines the maximum time between two pulses. In case of a pulse does
not occur, the dashcam starts recording.
If the "AutoTrigger" setting is activated, the corresponding input fields "Area of Triggering", "Bias" and
"Min Events" are enabled. When clicking the button "Area of Triggering" a new dialog opens for setting
the triggering area. Do not confuse this area with the camera area! The triggering area must be within the
Area of Interest of the camera. Every time a new triggering area is set, a check is performed evaluating
whether the new triggering area parameters are valid. A feedback message is displayed. The general input
handling is already described by section "Setting Area of Interest" above.
The Bias parameter describes the sensitivity threshold for detecting changes between images. These
changes are called events. If the entire number of events exceeds the minimum number defined by the
second field, a video record is triggered. The Min Events field is set in percentage relative to the triggering
area size. Typical range values are:
Bias 30 - 150
Min Events 5 – 50%
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