TM/TMC/RM/RMC-9730CL
12
Operation
3.6
External Sync
The TM-9730CL 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:
30 FPS
fHD = 15.73 KHz ±2%
fVD = 29.97 Hz ± 2%
Pixel clock = 14.318 MHz
3.7
3G Stagger Color Filter (Color Versions)
3.7.1
Color Filter Array
The color filter array is the staggered “3G” color mosaic filter pattern. The CFA contains 75% green
photosites and 25 red and blue photosites.
The digital format 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.” Current high-speed computers allow such
color interpolation to be done almost in real time. Because these cameras do not contain internal
color-processing circuitry, 3G stagger cameras are smaller and less expensive than full-function
color cameras.
3.7.2
3G Stagger Color Filter Array (CFA)
It is critical for the framegrabber and color interpolation to know where the individual color pixels
exist relative to sync (LDV and FDV) timing.
This requirement makes digital output the preferred choice, because the timing relationships are
very accurate.
3.7.3
Interpolation Software
The color interpolation can be performed in the frame grabber or by using the host computer’s CPU.
Most major frame grabbers with processing capability provide tools for color interpolation. Software
vision packages also provide color interpolation capability, but speed and performance may be
determined by the PC’s resources and by the complexity of the interpolation routine.
3.7.4
Color Interpolation
The “3G stagger” pattern color filter array (CFA) consists of R, G, and B primary colors. Each pixel
represents one of three colors. In order to display or print color images, the signal has to be
converted to RGB output, which has three independent channels (outputs) and sync signals.
Summary of Contents for TM-9730CL
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