Table Of Contents; Progressive Scanning - JAI TM-1327GE Series User Manual

8 Operation
This chapter contains information about performing operational procedures. It contains the
following sections:
•
"Progressive Scanning" on page 37
•
"Electronic Shutter" on page 41
•
"External Sync" on page 42
•
"Asynchronous Reset" on page 42
•
"Programmable Look-Up Table (LUT) and Knee Control" on page 45
•
"Camera Timing Charts" on page 46
•
"Video Output" on page 48
•
"External HD Locking and External VD Reset" on page 49
•
"Asynchronous Reset" on page 49

8.1 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 TM-1327GE 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, crisp image without alternating lines and provides full vertical TV resolution of
1040 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 TM-1327GE outputs the progressive scanned image with an electronic shutter in two different
formats.
•
Progressive scanning digital - The CCD signal goes through A/D converters 10-bit in, 10-bit/8-bit
out. The digital output is available using the Gigabit Ethernet connector.
•
Analog output - The analog output is the same as 75 ohms, 714mV format available from BNC
and 12-pin connector.
8.2 Bayer Color Filter (Color Versions)
JAI AccuPiXEL series color cameras are high-resolution, high-speed progressive scan CCD cameras.
The interline transfer, progressive scan CCD permits full vertical and horizontal resolution of images
acquired at very high shutter speeds. The electronic shutter, which has speeds to 1/16,000 sec., can
be reset asynchronously by external pulse control. Uniform square pixels provide superior image
definition in any orientation. On-chip micro lenses mean increased sensitivity.
8.2.1 Color Filter Array
JAI AccuPiXEL cameras use Bayer CFA (color filter array) as their standard primary color filter. This
filter provides the most popular color interpolation supported by numerous software suppliers.
TM/ RM -1327GE Series
Hardware Operation 35