Glossary 107
• LVD S
Low-voltage differential signalling. LVDS offers a general-purpose, high bandwidth
interface standard for serial and parallel data interfaces that require increased
bandwidth at high speed, with low noise and power consumption.
• Progressive scanning
Describes a transfer of data in which the lines of the source are written sequentially
into the destination buffer.
See also interlaced scanning.
• QDRII SRAM
Quad Data Rate II Static Random Access Memory. A type of memory used for
processing. QDRII SRAM allows the Processing FPGA to access data faster than
with DDR SDRAM.
• Real-time processing
The processing of an image as quickly as the next image is grabbed.
Also known as live processing.
• Reference levels
The zero and full-scale levels of an analog-to-digital converter. Voltages below a
black reference level are converted to a zero pixel value; voltages above a white
reference level are converted to the maximum pixel value. Together with the analog
gain factor, the reference levels affect the brightness and contrast of the resulting
image.
• Rotary encoder
A device used to convert the angular position of a shaft or axle to an analog or
digital code.
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