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Chapter 4 Blob Analysis
© National Instruments Corporation 4-7 IMAQ Visionfor LabWindows/CVIUser Manual
Convert Pixel Coordinates to Real-World Coordinates
If you need to find the location of the center of mass or the bounding
rectangle of the blobs in real-world units, use
imaqTransformPixelToRealWorld()
.
IMAQ_ELLIPSE_MAJOR
total length of the major axis of the ellipse having the
same area and perimeter as the particle in user-defined
units
IMAQ_ELLIPSE_MINOR
total length of the minor axis of the ellipse having the
same area and perimeter as the particle in user-defined
units
IMAQ_ELLIPSE_RATIO
fraction of the length of the major axis to the length of
the minor axis of the ellipse having the same area and
perimeter as the particle in user-defined units
IMAQ_RECT_LONG_SIDE
length of the long side of a rectangle having the same
area and perimeter as the particle in user-defined units
IMAQ_RECT_SHORT_SIDE
length of the short side of a rectangle having the same
area and perimeter as the particle in user-defined units
IMAQ_RECT_RATIO
ratio of rectangle long side to rectangle short side
IMAQ_ELONGATION
max intercept/mean perpendicular intercept
IMAQ_COMPACTNESS
particle area/(height × width)
IMAQ_HEYWOOD
particle perimeter/perimeter of circle having same area
as the particle
IMAQ_TYPE_FACTOR
complexfactor relatingthe surfacearea tothe moment of
inertia
IMAQ_HYDRAULIC
particle area/particle perimeter
IMAQ_WADDLE_DISK
diameter of the disk having the same area as the particle
in user-defined units
IMAQ_DIAGONAL
diagonal of an equivalent rectangle in user-defined units
Table 4-1. Particle Measurements (Continued)
Measurement Description