National Instruments IMAQ Vision for Measurement Studio - Manual (Page 99)

Glossary
IMAQ Vision for LabWindows/CVI User Manual G-12 ni.com
logic operators The image operations AND, NAND, OR, XOR, NOR, XNOR, difference,
mask, mean, max, and min.
lossless compression Compression in which the decompressed image is identical to the original
image.
lossy compression Compression in which the decompressed image is visually similar but not
identical to the original image.
lowpass attenuation Applies a linear attenuation to the frequencies in an image, with no
attenuation at the lowest frequency and full attenuation at the highest
frequency.
lowpass FFT filter Removes or attenuates high frequencies present in the FFT domain of an
image.
lowpass filter Attenuates intensity variations in an image. You can use these filters to
smooth an image by eliminating fine details and blurring edges.
lowpass frequency filter Attenuates high frequencies present in the frequency domain of the image.
A lowpass frequency filter suppresses information related to fast variations
of light intensities in the spatial image.
lowpass truncation Removes all frequency information above a certain frequency.
LSB Least significant bit.
L-skeleton function Uses an L-shaped structuring element in the skeleton function.
luma The brightness information in the video picture. The luma signal amplitude
varies in proportion to the brightness of the video signal and corresponds
exactly to the monochrome picture.
luminance See luma.
LUT Lookup table. Table containing values used to transform the gray-level
values of an image. For each gray-level value in the image, the
corresponding new value is obtained from the lookup table.
M
machine vision An automated application that performs a set of visual inspection tasks.
mask FFT filter Removes frequencies contained in a mask (range) specified by the user.