Data Translation DT3130 Series, Руководство пользователя

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Chapter 2
16
Color Intensity
Using software, you can adjust the following settings of a DT3130
Series board to affect the intensity of the color:
• Brightness
−
The value associated with a pixel representing its
gray value. Values range from
0
to 255 (in increments of 1); the
nominal value is 128.
• 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
255 (in increments of 1); the nominal value is 216.
• 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 255 (in increments of 1);
the nominal value is 180.
• 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 255 (in increments of 1);
the nominal value is 254.
• Hue
−
The intensity or shade of the color. Values range from 0 to
255 (in increments of 1); the nominal value is 128.
Pixel Clock
DT3130 Series boards generate 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 a DT3130 Series frame grabber board
in increments of
PixelPeriod , which is equal to 1 /clock frequency.