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NI-IMAQ for IEEE 1394 Cameras User Manual G-4 ni.com
P
page-locked buffer Memory page that is marked as non-pagable by the virtual file system.
Page-locked buffers remain in physical memory and do not cause page
faults
pixel 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).
process-safe handle A handle that allows only one process to access a camera at any given time.
protocol The exact sequence of bits, characters, and control codes used to transfer
data between computers and peripherals through a communications
channel.
Q
quadlet A 32-bit (four-byte) word.
R
real time A property of an event or system in which data is processed as it is acquired
instead of being accumulated and processed at a later time.
resolution (1) The number of rows and columns of pixels. An image composed of
m rows and n columns has a resolution of n × m. This image has n pixels
along its horizontal axis and m pixels along its vertical axis; (2) The
smallest signal increment that can be detected by a measurement system.
Resolution can be expressed in bits, proportions, or a percentage of
full scale. For example, a system has 12-bit resolution, one part in
4,096 resolution, and 0.0244 percent of full scale.
RGB Color encoding scheme using red, green, and blue (RGB) color information
where each pixel in the color image is encoded using 32 bits: 8 bits for red,
8 bits for green, 8 bits for blue, and 8 bits for the alpha value (unused).
ROI Region of Interest—(1) An area of the image that is graphically selected
from a window displaying the image. This area can be used focus further
processing; (2) A hardware-programmable rectangular portion of the
acquisition window.