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Operation
TM-1400 Series Progressive Scan Shutter Cameras
3.9.1 Color Filter Array
JAI PULNiX 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. Because these cameras do not
contain internal color-processing circuitry, they are smaller and less expensive than full-function color
cameras.
3.9.2 Bayer Color Filter Array (CFA)
The Bayer CFA is an R, G, B primary color filter array. This is the most widely accepted CFA for the
single-chip CCD progressive scan format. This type of array layout has a specific order for each color’s
pixels. Since the human eye’s resolution and color recognition are highest at green, the CFA contains
two greens per each red and blue.
It is critical for the frame grabber 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.