Data Translation DT3120, Руководство пользователя

Страница: 26 / 128

Principles of Operation
9
2
2
2
2
2
2
2
2
2
Color Intensity
Using software, you can adjust the following settings of the DT3120
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 511
(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 511 for blue, then the pixel is said to be
saturated in blue. Values range from 0 to 511 (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 511 for red, then the pixel is said to be
saturated in red. Values range from 0 to 511 (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
The DT3120 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 DT3120 frame grabber board in increments
of
PixelPeriod , which is equal to 1 /clock frequency.