Specifications

Glossary 95
•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.
•Saturate
To replace overflows (or underflows) in an operation with the highest (or lowest)
possible value that can be held in the destination buffer of the operation.