JAI TM-1402CL, User Manual, Page: 25 / 42

Operation 17
TM/TMC/RM/RMC-1402CL
3.7 Scan Modes
The TM-1402 supports the following scan modes:
3.7.1 Full Progressive Scan
The normal scan mode progressively scans a full frame of 1392 x 1040 pixels at 15/30 frames per second using
the standard 25MHz/50MHz pixel clock and a single channel output. In contrast to interlace-scan cameras, all
of the 1040 lines in the frame are exposed simultaneously per image capture.
3.7.2 Partial Scan
Partial scan is a standard feature in the TM-1402. The TM-1402 has two types of partial scan modes: 500 and
250 lines. Both modes can be selected through software control. The video image in partial scan mode is the
center 500 or 250 lines of video. The maximum frame rate at 500 lines is 56 fps. The maximum frame rate at
250 lines is 98 fps.
3.8 External Sync
The TM-1402 accepts an external sync of standard HD and VD at TTL level for general locking to a system sync
and clock. The external sync frequency requirement is as follows:
Table 7 External Sync
30 FPS 15 FPS
fHD = 31.1 KHz ±2% fHD=15.55 KHz±2%
fVD = 29.53 Hz ± 2% fVD=14.8 Hz±2% for 15 fps
Pixel clock = 50.00 MHz Pixel clock = 25.00 MHz
3.9 Bayer Color Filter (Color Versions)
JAI, Inc. 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.
3.9.1 Color Filter Array
JAI, Inc. 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. The digital format,
either Camera Link or RS-644, allows the camera to output accurate pixel data, including the color information.
When the data is stored in the frame buffer of a frame grabber or computer, the color information is easily
manipulated to restore the original color images. Because the color filter array contains only a single R, G or B
color in each pixel, the restored image has to fill in colors in the missing pixel locations. The software uses
neighboring pixel information to “guess” the missing colors to make smooth, clear images. This is called “color
interpolation.” Today's high-speed computers allow such color interpolation to be done almost in real time.