Справочник Пользователя для National Instruments IEEE 1394

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.

quadlet

A 32-bit (four-byte) word.

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.