National Instruments IMAQ PCI-1407 User Manual page 48

Glossary
N
NI-IMAQ
noninterlaced
NVRAM
O
operating system
P
PCI
PCLK
picture aspect ratio
pixel
pixel aspect ratio
pixel clock
pixel count
progressive scan
IMAQ PCI/PXI-1407 User Manual
Driver software for National Instruments IMAQ hardware.
A video frame where all the lines are scanned sequentially, instead of
divided into two frames as in an interlaced video frame.
Nonvolatile RAM. RAM that is not erased when a device loses power or is
turned off.
Base-level software that controls a computer, runs programs, interacts with
users, and communicates with installed hardware or peripheral devices.
Peripheral Component Interconnect. A high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA. PCI
offers a theoretical maximum transfer rate of 132 Mbytes/s.
Pixel clock signal. Times the sampling of pixels on a video line.
The ratio of the active pixel region to the active line region; for standard
video signals like RS-170 or CCIR, the full-size picture aspect ratio
normally is 4/3 (1.33).
Picture element. The smallest division that makes up the video scan line;
for display on a computer monitor, a pixel's optimum dimension is square
(aspect ratio of 1:1, or the width equal to the height).
The ratio between the physical horizontal size and the vertical size of the
region covered by the pixel; an acquired pixel should optimally be square,
thus the optimal value is 1.0, but typically it falls between 0.95 and 1.05,
depending on camera quality.
Divides the incoming horizontal video line into pixels.
The total number of pixels between two horizontal synchronization signals.
The pixel count determines the frequency of the pixel clock.
non-interlaced format video
G-8 ni.com