JAI TM-6740GE, Operation Manual

Page: 56 / 80

Page 44
Operation
TM-6740GE Hardware
8.2.6 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.
8.2.7 Color Interpolation
The Bayer 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.
Color interpolation software or firmware performs the color
preprocessing by filling the missing color pixels with neighboring
pixels. It then separates the stream of data, (8-bit or 10-bit) into 3 (RGB)
data (8-bit x 3) and adds the color matrix to adjust and balance each of
the R,G, and B channels (white balance or color balance).
The image quality depends on the camera’s own pixel data (including
pixel data independency from neighboring pixels, noise and color filter),
and interpolation of the software algorithm such as 3 x 3 interpolation, 2
x 2 interpolation, color matrix, white balance capability, etc.
All AccuPiXEL color cameras are carefully designed for maximum color performance. JAI PULNiX
strongly suggests that you use digital output for the best performance.
Some software is used on board (FPGA or DSP) to perform the interpolation. Other software simply
uses the host computer’s memory and CPU. The process speed may vary depending on the architecture
and speed of the computer.
8.3 Electronic Shutter
The TM-6740GE has a substrate drain-type shutter mechanism which provides a superb picture at
various speeds without smearing. A built-in fixed shutter speed control selects the electronic shutter rate
from 1/xx to 1/64,000.
Green
Green
Green Green
Green Red
Red
Blue Blue