ALLIED Vision Technologies Guppy F-503 - Manual (Page 157)

Description of the data path
GUPPY Technical Manual V7.1.0
157
Effects of a HiDy sensor
The Micron/Aptina MT9V022 as a typical HiDy sensor shows a large decrease
of FPN (fixed pattern noise) after crossing the knee-points. This leads to a
very good image quality. Most of the signal range measures as low as 1.5 LSBs
of temporal noise (compared to a normal linear sensor with ~4 LSBs of tem-
poral noise).
Setting one knee point Setting two knee points
In single knee automatic exposure mode, the
placement of a single knee point is set automati-
cally. In two knee automatic exposure mode, the
placement of the two knee points is set automat-
ically.
Pixel output response for one knee operation Pixel output response for two knee operation
Table 53: Setting knee points and pixel output response
Histogram (HiDy off) Histogram (HiDy on)
This is a histogram example from an outdoor scene taken with HiDy off (left) and HiDy on (right). The
HiDy mode is able to show details in both the bright and dark areas to be resolved in a single image.
Table 54: Histogram with HiDy off (left) and HiDy on (right)