JAI TS-1327EN Series, Руководство пользователя

Страница: 39 / 64

Camera Features 29
EN Camera Series
6 Camera Features
6.1 Progressive Scanning
Standard TV-system scanning is 525 lines interlace scanning as specified in the RS-170 protocol.
Every other horizontal line (odd lines and even lines) is scanned at a 60Hz rate per field, and the
scanning is completed with two fields (one frame) at 30Hz rate. Because of the interlace scanning,
the vertical resolution of CCD cameras is limited at 350 TV lines, regardless of the horizontal
resolution. When electronic shutter is applied, the CCD can hold only one field of charge at each
exposure. This means that the vertical resolution of the electronic-shutter camera is only 244 TV
lines. The situation is the same for an HDTV-format camera, since it has interlaced scanning and the
vertical resolution of the shuttered image is 500 lines.
The JAI EN camera uses a state-of-the-art progressive scanning interline transfer CCD which scans
all lines sequentially from top to bottom at one frame rate. Like a non-interlace computer screen, it
generates a stable, and crisp image without alternating lines.
The interline transfer architecture is also important to generate simultaneous shuttering. This is
different from full frame transfer architecture which requires a mechanical shutter or strobe light in
order to freeze the object motion.
The TS-2030EN model (1920 x 512 resolution) enables the 30Hz frame rate by scanning 512 lines out
of the entire 1080 lines. This technique significantly reduces smear and blooming, which tend to be
significant problems in daylight outdoor applications such as intelligent transportation systems (ITS).
The TS-2076EN model (1920 x 768 resolution) enables the 21Hz frame rate by scanning 768 lines.
The TS-2076EN has higher smear and blooming incidents than the TS-2030EN. However, for those
applications that require more vertical resolution, users will find that the slightly higher smear and
blooming levels of the TS-2076EN are a good trade-off and make it an excellent choice for red light
violation or speed enforcement use.
The TS-1327EN model (1392 x 1040 resolution) enables the 15 Hz frame rate by scanning 1040 lines.
Wider vertical FOV and high NIR sensitivity provide excellent choice not only for ANPR/LPR tolling
application but also for scene overview applications of Red light and speed enforcement.
6.2 Asynchronous Reset
The video signal starts with internal VD. When the external VINIT pulse is applied, internal VD is
latched to HD and the internal VD is delayed to set up the shutter speed period. The shutter speed
is controlled by the dial switch from “0” to “F.” Video output timing starts right after the internal
VD and single shots, FDV is output at the internal VD timing.