National Instruments IMAQ Vision for Measurement Studio - Manual (Page 95)

Glossary
IMAQ Vision for LabWindows/CVI User Manual G-8 ni.com
H
highpass attenuation Applies a linear attenuation to the frequencies in an image, with no
attenuation at the highest frequency and full attenuation at the lowest
frequency.
highpass FFT filter Removes or attenuates low frequencies present in the FFT domain of an
image.
highpass filter Emphasizes the intensity variations in an image, detects edges (or object
boundaries), and enhances fine details in an image.
highpass frequency
filter Attenuates or removes (truncates) low frequencies present in the frequency
domain of the image. A highpass frequency filter suppresses information
related to slow variations of light intensities in the spatial image.
highpass truncation Removes all frequency information below a certain frequency.
histogram Indicates the quantitative distribution of the pixels of an image per
gray-level value.
histogram
equalization Transforms the gray-level values of the pixels of an image to occupy the
entire range (0 to 255 in an 8-bit image) of the histogram, increasing the
contrast of the image.
histogram inversion Finds the inverse of an image. The histogram of a reversed image is equal
to the original histogram flipped horizontally around the center of the
histogram.
hit-miss function Locates objects in the image similar to the pattern defined in the structuring
element.
hole filling function Fills all holes in objects that are present in a binary image.
HSI Color encoding scheme in Hue, Saturation, and Intensity.
HSL Color encoding scheme using Hue, Saturation, and Luma information
where each image in the pixel is encoded using 32 bits: 8 bits for hue,
8 bits for saturation, 8 bits for luma, and 8 bits for the alpha channel.
HSV Color encoding scheme in Hue, Saturation, and Value.
hue Represents the dominant color of a pixel. The hue function is a continuous
function that covers all the possible colors generated using the R, G, and
B primaries. See also
RGB .