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Assigning camera address and "Device ID".
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| A camera address must already be assigned to a Cohu PTZ device before using it with this driver (the Cohu PTZ device have no DIP-switches for assigning camera addresses).
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"Joystick" navigation and "continuouspantiltmove".
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| NOTE! The continuouspantilt movements (e.g joystick control) may stall or block the tilt moter when tilting down. This may damage the unit! Check that a continuous tilt down movement do not block or stall the tilt moter (tilt down and check that the tilt movement stops by itself before blocking). If the tilt movement will block, try to contact Cohu support and ask if it is possible to upgrade the firmware in the Cohu unit to avoid the stall/block of the tilt down movement. If it is not possible to upgrade the firmware and avoid the stall/block of the tilt down movement, then it is probably not possible to use the continuous pantilt movement command without problems!
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Tilt limits and tilt calibration.
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| NOTE! The mechanical tilt limits("Up" and "Down", see below) and the tilt calibration parameters("Tilt steps offset" and "Tilt steps per unit", see below) are model dependent. The default values are tested with a Cohu iVIEW 3950 model. With different models, these settings may need to be recalibrated. While calibrating, be careful not to exceed the movement specifications of the unit!
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Movement limits and continuous tilt
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| The movement limits for tilt are not 100% realiable when set close to the mechanical limits.
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Limits for "Zoom tele" and digital zoom.
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| NOTE! If digital zoom is not supported, set the limit for "Zoom tele" = 9999 (see below), otherwise zoom movements may result in unpredictable behaviour.
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Manual focus and zoom move.
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| A zoom move will set autofocus=on. After a zoom move, a short delay is required before a manual focus move is possible.
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Presets saved in the Cohu PTZ unit and digital zoom.
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| When saving a preset in the Cohu PTZ unit (device presets), the digital zoom position is not saved (e.g. device presets are only saved in optical zoom area).
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Preset positions.
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| When saving a preset position, only pan, tilt and zoom positions are saved in the preset.
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Video Source Configuration |
| Parameter |
Description |
Range |
| Device ID |
This is the address of the connected device. This value should correspond to a previously assigned address in the Cohu PTZ device(see above). |
1-223 |
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Driver Specific Settings
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| Parameter |
Description |
Range |
| Flip pan |
If set to true, pan operations will be inverted |
true, false |
| Flip tilt |
If set to true, tilt operations will be inverted |
true, false |
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Mechanical limits
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| Movement Limits |
Minimal value |
Maximal value |
Comment |
| Left |
-180 |
180 |
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| Right |
-180 |
180 |
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| Up |
-95 |
95 |
Note! Model dependent. |
| Down |
-95 |
95 |
| Proportional speed |
1 |
1000 |
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| Zoom Limits |
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| Zoom wide |
1 |
19999 |
Note! If digital zoom is not supported, set Maximal value = 9999. |
| Zoom tele |
1 |
19999 |
| Optical Data |
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Light Control
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| Parameter |
Description |
Range |
| IR cut filter |
Set to on to enable the infrared cut filter. |
on, off |
| Back light compensation |
Set to on to enable back light compensation. |
on, off |
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Extended Driver Specific Settings
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| Parameter |
Description |
Range |
| Tilt steps offset |
The calibration constant for the horizontal tilt position. Higher values give a higher tilt position. Calibrate by confirming that a horizontal tilt request (i.e. "tilt=0") will result in a horizontal tilt position. |
0-2050 |
| Tilt steps per unit |
The calibration constant for the tilt movement. Higher values give bigger tilt movements. If the tilt scale is known, calculate this parameter value as 1000 * "tilt steps/degree". Calibrate by confirming that a tilt request (e.g. "rtilt=-45") will result in a correct tilt movement. |
1-100000 |
| Focus time |
The calibration constant for focus (time in ms for maximum focus change). Higher values give greater focus changes. Calibrate by confirming that a maximum focus request (i.e. "rfocus=9999") at one extreme (e.g. focus near) takes you to the other. |
1-65535 |
| Iris time |
Calibration constant for iris (time in ms for maximum iris change). Higher values give greater iris changes. Calibrate by confirming that a maximum iris request (e.g. "riris=9999") at one extreme (e.g. full iris close) takes you to the other. |
1-65535 |
| Field angle compensation |
Calibration constant for click-in-picture (center) movements when using lenses with non linerar zoom scale. Higher values give smaller pan/tilt movements. First calibrate the "Min field angle" and the "Max field angle" limits(see above) and then zoom in half way (optical, i.e. "zoom=5000"). Calibrate by confirming that clicking on an object brings the object to the center of the image. |
-100-100 |
| Goto preset delay |
Time (in seconds) it takes for the image to stabilize it self, after the camera has performed the longest "goto device preset action". Used for disabling/enabling image analysis (e.g. motion detection). Note that this does not apply for server presets. |
0-100 |
| Optical data |
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| Min field angle |
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1-1000 |
| Max field angle |
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1-1000 |
The optical data limits are used to tune image centering:
- Zoom out completely and adjust Max Field Angle until the spot you click becomes centered accurately.
- Zoom in completely(optical only, i.e. "zoom=9999") and repeat for Min Field Angle.
- For a non linear zoom scale, calibrate the parameter "Field angle compensation".
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