National Instruments IMAQ Vision for LabWindows TM /CVI User Manual

Page 49

Chapter 4

Performing Particle Analysis

4-7

IMAQ_MT_HU_MOMENT_5

Fifth Hu moment

IMAQ_MT_HU_MOMENT_6

Sixth Hu moment

IMAQ_MT_HU_MOMENT_7

Seventh Hu moment

IMAQ_MT_HEYWOOD_CIRCULARITY_FACTOR

Perimeter divided by the
circumference of a circle
with the same area

IMAQ_MT_HOLES_PERIMETER

Sum of the perimeters of each hole in
the particle

IMAQ_MT_HYDRAULIC_RADIUS

Particle area divided by the particle
perimeter

IMAQ_MT_HOLES_AREA

Sum of the areas of each hole in the
particle

IMAQ_MT_IMAGE_AREA

Area of the image

IMAQ_MT_MAX_FERET_DIAMETER

Distance between the start and end of
the line segment connecting the two
perimeter points that are the furthest
apart

IMAQ_MT_MAX_FERET_DIAMETER_END_X

X-coordinate of the end of the
line segment connecting the two
perimeter points that are the furthest
apart

IMAQ_MT_MAX_FERET_DIAMETER_END_Y

Y-coordinate of the end of the
line segment connecting the two
perimeter points that are the furthest
apart

IMAQ_MT_MAX_FERET_DIAMETER_ORIENTATION

Angle of the line segment connecting
the two perimeter points that are the
furthest apart

IMAQ_MT_MAX_FERET_DIAMETER_START_X

X-coordinate of the start of the
line segment connecting the two
perimeter points that are the furthest
apart

Table 4-1. Particle Measurements (Continued)

Measurement

Description