National Instruments IMAQTM 用户手册

barycenter

The grayscale value representing the centroid of the range of an image’s 
grayscale values in the image histogram.

binary image

An image in which the objects usually have a pixel intensity of 1 (or 255) 
and the background has a pixel intensity of 0.

binary morphology

Functions that perform morphological operations on a binary image.

binary threshold

The separation of an image into objects of interest (assigned a pixel value 
of 1) and background (assigned pixel values of 0) based on the intensities 
of the image pixels.

bit depth

The number of bits (n) used to encode the value of a pixel. For a given n, 
a pixel can take 2

 different values. For example, if n equals 8, a pixel can 

take 256 different values ranging from 0 to 255. If n equals 16, a pixel can 
take 65,536 different values ranging from 0 to 65,535 or –32,768 to 32,767.

blurring

Reduces the amount of detail in an image. Blurring commonly occurs 
because the camera is out of focus. You can blur an image intentionally by 
applying a lowpass frequency filter.

BMP

Bitmap. An image file format commonly used for 8-bit and color images. 
BMP images have the file extension BMP.

border function

Removes objects (or particles) in a binary image that touch the image 
border.

brightness

(1) A constant added to the red, green, and blue components of a color pixel 
during the color decoding process. 

(2) The perception by which white objects are distinguished from gray and 
light objects from dark objects.

buffer

Temporary storage for acquired data.