Open the Exposure Settings dialog to adjust the exposure of the camera and to optimize it for the lighting conditions at the camera location. The MOBOTIX camera is equipped with several automatic features so that the best possible images can be created under all weather and lighting conditions. Normally, only extreme conditions call for manual modifications of the exposure settings.
In order to facilitate the configuration of the camera, it provides image programs, which quickly and easily adjust the camera to different application scenarios.
Some of these settings can also be changed using the pull-down menus above the image on the Live screen.
Click on the More button at the bottom of the dialog to display all options.
Linked Image Control |
This mode uses the same exposure values and internal image correction settings for both sensors. This ensures that the images from both sensors look as similar as possible. NoteThis parameter is only available for models with identical image sensors. |
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Automatic Contrast |
The automatic contrast should always be activated in order to create high-contrast images under all lighting conditions.
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Brightness |
Changing the Brightness parameter will adjust the entire image area. Notes
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Backlight Correction |
This parameter also is used for adjusting the brightness of an image. However, it only affects the darker portions of an image. Notes
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Exposure Mode |
Full Image Area: The full image of the sensor (i.e. the 1x Zoom, no lens correction on cameras which have this feature) is used to determine the proper exposure. The following parameters for exposure windows, exposure weighting and white balance weighting are used to set the appearance of the image. This is the preferred mode when using Full Image Recording in the background. This mode guarantees that the recording channel always keeps its exposure. Visible Image Area: This mode optimizes exposure control for the visible image section. Other parameters are not used, i.e. the settings of the exposure windows, exposure weighting and white balance weighting parameters are ignored. NoteIf the camera uses Full Image Recording, this setting could render the recorded images unusable (e.g. when zooming into very dark or very bright areas of the image, the rest of the image will be overexposed or underexposed, respectively). |
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Exposure Window |
Exposure windows are defined image areas that are used for exposure and color adjustment. To facilitate exposure window positioning, you can select from a number of pre-defined exposure windows. Notes
Predefined exposure windows
Custom exposure windowsFor more information on how to define these windows, please the Using Custom Windows section. |
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Exposure Weighting |
Using this parameter, you can define how much the exposure windows are to be considered for exposure control—relative to the rest of the image. Values: Total, 0%.. 100% The Total setting will use the entire image for exposure control. The factory default setting is 100%, which means that only the exposure windows are used for exposure control. |
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White Balance Weighting |
Using this parameter, you can define how much the exposure windows are to be considered for white balancing—relative to the rest of the image. Values: Total, 0%.. 100% The factory default setting is Total, which means that the entire image is used for white balance. The setting of 100% means that only the exposure windows are used for exposure control. NoteThe values of 0%..90% are not available on some image sensors. |
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Show Windows |
On: Shows the defined exposure window(s) as green box(es) within the image. Exclusion windows are shown with a red frame. The Histogram option shows additional parameters of specific image processing features in the image. |
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Average Brightness |
This parameter of exposure control (default is 40%) specifies the average brightness of the image pixels considered for exposure control (→ exposure windows) that the camera tries to reach; it is thus the target value for the finished image's brightness. In order to reach this value, the camera first tries to change the exposure time within the limits set by the minimum and maximum exposure time and adjusts the hardware amplification within the internally defined limits. |
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Minimum Average Brightness |
If the brightness continues to decrease, the camera extends the exposure time and increases the hardware amplification to maintain the specified average brightness, until the maximum exposure time has been reached. If it still gets darker, the image brightness drops below the value of the average brightness and approaches the value of the minimum average brightness. If the image brightness drops below this value, the camera will activate the software amplification to maintain the minimum average brightness for as longs as possible. When using this parameter, the following rules apply:
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Night Improvement |
This feature improves the contrast of dark images. NoteActivating this parameter may result in an increase of image noise. |
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Sensor Gain Range |
This parameter sets the range in which the hardware gain is operating. When using this parameter, the following rules apply:
Notes
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Exposure Program |
Use this parameter to influence the balance between an exposure time that is as short as possible and hardware amplification that is as low as possible. The objective is to reach a fair compromise between clear images of moving objects (short exposure time, high amplification) and as little image noise as possible (long exposure time, low amplification). When using the camera in a web application, a positive value would create images with little amplification (i.e. little image noise); moving objects would be displayed in a blurred manner. On the other hand, a security application would require a negative value to show moving objects as clearly as possible, even if this would mean higher image noise. |
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Max. Exposure Time |
Set the maximum exposure time in seconds. |
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Min. Exposure Time |
Set the minimum exposure time in seconds. |
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Frequency of Power Supply |
This parameter sets the camera to the power supply frequency of the respective country to prevent interference by artificial light. The factory default setting for Europe is 50 Hz. For Canada, the U.S.A. and Japan, set the power supply frequency to 60 Hz. If the camera is used in daylight conditions (rather than artificial illumination), you can also use the No artificial light setting. |
This value allows using custom exposure windows. You can define such a window by creating a selection rectangle in the live image ([Shift]-click, click into the image, then click on Add Rectangle), by using the Exposure Control Quick Control or manually by editing the exposure window definitions in the Custom Windows text field.
Every line in the definition box that does not begin with a hash sign (#
, comment - can be used to deactivate exposure windows) defines one exposure window.
Exposure windows can be defined either as rectangles or as polygons.
Rectangle syntax:
[#]image sensor, horizontal position, vertical position, width, height[, in/out]
(optional parameters have square brackets)
0,224,168,832,624,in
Polygon syntax:
[#]image sensor, poly=<hor. coordinate>x<vert. coordinate>{/<hor. coordinate>x<vert. coordinate>}[, in/out]
(optional parameters have square brackets, parameters that can be used as often as needed have curly brackets)
0,poly=224x168/224x791/1055x791/1055x168,in
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Introduces a comment line. Can be used to temporarily deactivate an exposure window definition without having to delete it. |
Image sensor |
0 = right camera lens 1 = left camera lens |
Horizontal position |
Position of the left exposure window border measured from the left edge of the visible image in pixels (based on a MEGA image 1280x960). |
Vertical position |
Number of pixels measured from the bottom edge of the visible image to the bottom border of the exposure window (based on a MEGA image 1280x960). |
Width |
Width of the exposure window in pixels (based on a MEGA image 1280x960). |
Height |
Height of the exposure window in pixels (based on a MEGA image 1280x960). |
Horizontal coordinate |
Number of pixels measured horizontally from the left edge of the visible image to the polygon corner (based on a MEGA image 1280x960). |
Vertical coordinate |
Number of pixels measured vertically from the bottom edge of the visible image to the polygon corner (based on a MEGA image 1280x960). |
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The current exposure window defines an area that is used for exposure control (default). If Show Windows is set to On, the exposure windows will be displayed with a green frame. |
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The current exposure window defines an area that is excluded from exposure control. If Show Windows is set to On, the exposure windows will be displayed with a red frame. Exclusion windows are used to remove specific areas within "regular" exposure windows from exposure control. |
Fare clic sul pulsante Imposta per attivare le impostazioni e salvarle fino al prossimo riavvio della videocamera.
Fare clic sul pulsante Default per caricare i valori di default di questa finestra di dialogo (opzione non presente in tutte le finestre di dialogo).
Fare clic sul pulsante Ripristina per annullare le modifiche più recenti che non sono state memorizzate in modo permanente nella videocamera.
Fare clic sul pulsante Chiudi per chiudere la finestra di dialogo. Durante la chiusura della finestra di dialogo il sistema verifica eventuali modifiche nella configurazione. Se le rileva chiede di memorizzare in modo permanente l'intera configurazione.