First
Steps
© PHYTEC Messtechnik GmbH 2011 L-740e_0
29
•
Light sensitivity
The camera's sensitivity determined together with the lens quality
and the aperture set, as long as the image for a given lighting must
be illuminated so that it is acceptable visible.
The higher the light sensitivity, to be shorter can be chosen the
exposure time under otherwise identical conditions. Or the other
way: Aperture or lighting can be reduced if the light sensitivity is
higher.
Some models of USB-CAMs have the opportunity to reduce the
resolution by binning. Binning neighboring pixels edited together
into a larger virtual pixels.
As a result, the light sensitivity of the individual pixels are
combined. The camera is more light sensitive.
Use the binning mode, if you need a higher light sensitivity of the
camera.
•
Sensor format
epending on the method of resolution reduction, changed the
virtual sensor format and the actual photosensitive area of the
image sensor.
By reducing the resolution by the formation of a selection window
on the sensor (ROI - Region of Interest), decreases the active
image area.
This effect is taken into consideration in the calculation and
selection of suitable lens (see Section 3.2).
The use of binning does not change the sensor format.
T
The following tables show the parameters for different camera
models:
Models
USB-CAM-003H, USB-CAM-103H
USB-CAM-004H, USB-CAM-104H
Resolution
Format
fps
Sensitivity
resolutions by software
744 x 480
640 x 480
320 x 240
1/3"
1/3,5"
1/7"
60
90
150
4,8 V/lux-sec
4,8 V/lux-sec
4,8 V/lux-sec
Figure 23:
resolutions
W-VGA-Models
