National Instruments IMAQTM 用户手册

spatial filters

Alter the intensity of a pixel relative to variations in intensities of its 
neighboring pixels. You can use these filters for edge detection, image 
enhancement, noise reduction, smoothing, and so forth.

spatial resolution

The number of pixels in an image, in terms of the number of rows and 
columns in the image.

square function

square root function

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standard representation

Contains the low-frequency information at the corners and high-frequency 
information at the center of an FFT-transformed image.

structuring element

A binary mask used in most morphological operations. A structuring 
element is used to determine which neighboring pixels contribute in the 
operation.

subpixel analysis

Finds the location of the edge coordinates in terms of fractions of a pixel.

template

A color, shape, or pattern that you are trying to match in an image using the 
color matching, shape matching, or pattern matching functions. A template 
can be a region selected from an image or it can be an entire image.

threshold

Separates objects from the background by assigning all pixels with 
intensities within a specified range to the object and the rest of the pixels to 
the background. In the resulting binary image, objects are represented with 
a pixel intensity of 255 and the background is set to 0.

threshold interval

Two parameters, the lower threshold gray-level value and the upper 
threshold gray-level value.

TIFF

Tagged Image File Format. An image format commonly used for encoding 
8-bit, 16-bit, and color images. TIFF images have the file extension TIF.

time-bounded

Describes algorithms that are designed to support a lower and upper bound 
on execution time.

tools palette

A collection of tools that enable you to select regions of interest, zoom in 
and out, and change the image palette.