Data Translation DT3153, User Manual

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Principles of Operation
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Color Controls
Using software, you can adjust the following color settings of the
DT3153 board:
• Brightness
−
The value associated with a pixel representing its
gray value. Values range from 0 to 255; the nominal value is 163.
• Contrast
−
The overall range of the monochrome signal of an
image. For example, a high contrast image has a large range
between black and white values; a low contrast image has a small
range between black and white values. Values range from 0 to
511; the nominal value is 233.
• V-Saturation
−
The purity of the blue and green primary colors in
an image. For example, if a particular pixel has a value of 0 for
green, but a value of 256 for blue, then the pixel is said to be
saturated in blue. Values range from 0 to 511; the nominal value is
235.
• U-Saturation
−
The purity of the green and red primary colors in
an image. For example, if a particular pixel has a value of 0 for
green, but a value of 256 for red, then the pixel is said to be
saturated in red. Values range from 0 to 511; the nominal value is
165.
• Hue
−
The intensity or shade of the color. Values range from 0 to
255; the nominal value is 128.
Pixel Clock
The DT3153 generates a 12.5 MHz pixel clock signal for 60 Hz image
formats and a 15 MHz pixel clock signal for 50 Hz image formats.
Pixels are available to the DT3153 frame grabber board in increments
of
PixelPeriod , which is equal to 1 /clock frequency.
With no more than ±6 ns jitter, the DT3153 board synchronizes the
pixel clock to the first frame of an asynchronous external video
source.