Phytec FireWire-CAM-011H, Manual

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FireWire-CAM-011H/-012H
52
©
PHYTEC Messtechnik GmbH 2006 L-680e_1
Exposure reference
(DCAM): The automatic Shutter/Gain mode is
based on a regulation loop that extracts grey scale value samples from
the image and calculates the average brightnes from them. This
average value is then compared with the exposure reference and in
case of a discrepancy, Shutter resp. Gain will be changed accordingly.
The image area from where the random samples are taken determines
the according setting of the backlight correction (
see below
).
Thus this value sets the average brightness (background brightness) of
the image in the automatic mode.
Gain/Contrast
(DCAM): The amplification gain (also called contrast)
influences the electrical output signal of the CCD. This is an electrical
amplification of the image signal.
More details are provided in the
shutter description above.
Offset/Brightness
(DCAM): The offset (also called brightness)
influences the direct voltage offset of the CCD output signal directly.
Visually this is perceived to be an adjustment of the picture
brightness. As opposed to the contrast setting, the brightness setting
does not change the relationship of dark to light.
This parameter can be set manually or automatically.
Gamma
(DCAM): If gamma correction is switched on the camera
will output the gray levels adapted to the non-linear characteristics of
picture tube based monitors.
With activated gamma correction the image looks richer in contrast –
expecially with monochrome cameras.
Hue
(DCAM): The adjusting controller for the tone,
Hue
, sets the
particular hue. With that a correction or even a deliberate distortion
can be made.
Saturation
(DCAM, FireWire-CAM-x12H only): This parameter
allows the manual setting of color saturation from black and white to
extremely saturated colors. This allows the picture display to be
adapted to color sensitivity or the picture environment.
You can shut off this function if it is not required.