Intelligent Roadway Information System
Video cameras with remote pan, tilt, and zoom capability can be used to monitor freeway conditions. The Camera tab can display Motion JPEG (MJPEG) video. To view MPEG4 or h.264 video, the MonStream application is required.
View ➔ Video ➔ Encoder Types menu item
An encoder type represents a specific make and model of video encoder. All cameras with the same type share a common configuration.
A stream contains fields needed for consuming video from a camera. Encoder types can have multiple streams for differing quality.
For cameras with multiple fixed-position views, a number can be used to identify them.
|View Num||Fixed-position view, usable as a preset number|
|Flow stream||If checked, the stream is a flow stream sink from streambed|
|Quality||Resolution and frame rate comparison:
|URI scheme||Scheme part of unicast request URI:
|URI path||Path part of unicast request URI. Query parameters may be appended; use
|Multicast port||Port for camera’s multicast address|
|Latency||Buffering latency (ms) for consuming stream|
A stream can be either unicast or multicast, but not both. For a multicast stream defined by an SDP file, specify the URI scheme and path instead of multicast port.
View ➔ Video ➔ Cameras menu item
The Setup tab within a camera properties form contains attributes to configure the video encoder.
|Cam Num||Camera number, used for keyboards|
|Encoder Type||The type of video encoder|
|Encoder Address||IP address for unicast streams (or SDP files)|
|Encoder Port||Port number for unicast streams (overrides scheme default)|
|Multicast Address||IP address for multicast streams|
|Encoder Channel||Channel number, for encoders which support multiple cameras|
|Publish||Flag to allow public viewing of camera video|
|Streamable||Flag to indicate whether stream is available|
Pan Tilt and Zoom
Many cameras have built-in pan/tilt/zoom (PTZ) functionality. The following operations can be performed:
- Panning or tilting the camera
- Zooming in or out
- Manual focus: near / far
- Manual iris: open / close
- Wiper control
- Recall preset positions
- Store preset positions
For PTZ control to function, the camera must be associated with a controller on a PTZ protocol comm link.
A selected camera can be panned and/or tilted by clicking on the video display on the Camera tab. The pan/tilt speed will vary depending on distance from the mouse-click to the center of the image. Similarly, using a mouse wheel on the video display will cause the camera to zoom in or out.
Below the video display, there are also buttons for PTZ, as well as focus, iris and wiper control.
The Preset tab within a camera properties form can be used to configure up to 12 presets per camera. A preset can be associated with either a compass direction or a device, such as DMS or ramp meter. To associate a preset with a device, enable the preset, then select that preset on the Location tab of the device’s properties form.
If a stream is defined with a view num that matches the preset num, that stream will be selected instead of a typical PTZ preset.
The selector tool is on the toolbar just below the map. It has a text entry field with a camera icon and label. This tool enables quick switching of the selected camera.
The keyboard numpad can be used from anywhere within IRIS to control the
selector tool. When the
Num Lock key is off, all numpad keystrokes are
directed to the tool. The
- keys can select the next and previous
. key (on the numpad) changes to video monitor selection mode —
the icon will change to a monitor. Pressing the
* key (on the numpad) changes
to play list selection mode — the icon will change to a play list.
Dedicated keyboards are supported for easier camera control. These keyboards have joysticks for pan / tilt / zoom control. Two protocols are supported: Pelco-P and Panasonic CU-950.
To configure a Pelco-P keyboard, a comm link using the
must be created. One active controller must exist on that comm link, but no
devices are necessary. IRIS will initiate a TCP connection to connect to the
keyboard — typically, this will be managed by an ethernet-to-serial device.
For Panasonic CU-950 keyboards, the
system attribute must be set to
true. This will cause IRIS to listen for
connections on TCP port 7001. The keyboard must be configured with the IRIS
server’s IP address.
The video servlet is a proxy server which provides MJPEG streams to IRIS
clients. Properties in the iris-client.properties file are used to configure
use of the video servlet:
specified, video requests will be made to
Otherwise, requests will be made directly to the camera’s encoder address.