5.2 Physical Anti-Collision Based on Support Vector Machine (SVM)
177
sends a hopping signal to activate the laser ranging sensor. Consequently, we could
calculate the average reading distance of RFID antenna to tags when the cycle index
reaches the set value. Eventually, the tray returns to initial point and repeats the above
operation in the case of changing the distribution of tags.
The measurement of reading distance is indirect to the survey. Adjusting the
optical lifting platform to ensure the laser beam of laser ranging sensor aiming at the
boxes, we define the intersections of laser ranging sensor’s beam and antenna stand
plane to reference point.
The distance of tags to reference point is
T = S − L
(5.30)
where L is the deterministic distance of laser ranging sensor to reference point and
S is the distance of laser ranging sensor to tags.
The distance of ith RFID antenna to tag is
R i =
T
2
+ H
2
i
1/2
(5.31)
where H i is the distance of ith RFID antenna to reference point. Once the antennas of
reader are fixed on the antenna stand, the distance of ith RFID antenna to reference
point is measured manually and then input to the main program. In whole measurement, the distance is constant. In practice, the boxes are set to the same and the tags
are on the front of the boxes.
5.2.2 Position Location of Tags
The purpose of image recognition is to identify target automatically. In image recognition system, the quality of images is improved and the target is identified or classified.
The mathematical morphology is used to extract image components that are useful
in the representation and description of region shape (such as boundaries, skeletons,
and convex hull).
Dilation and erosion are the basic elements of mathematical morphology. In this
paper, we use dilation and erosion to remove the noise of image. With A and B as
sets in Z
2 , the dilation of A by B, denoted A ⊕ B, is defined as [30]
A ⊕ B = {z|(B) z ∩ A = ∅}
(5.32)
For sets A and B in Z
2 , the erosion of AB is defined as
AB = {z|(B) z ⊆ A }
(5.33)
177
sends a hopping signal to activate the laser ranging sensor. Consequently, we could
calculate the average reading distance of RFID antenna to tags when the cycle index
reaches the set value. Eventually, the tray returns to initial point and repeats the above
operation in the case of changing the distribution of tags.
The measurement of reading distance is indirect to the survey. Adjusting the
optical lifting platform to ensure the laser beam of laser ranging sensor aiming at the
boxes, we define the intersections of laser ranging sensor’s beam and antenna stand
plane to reference point.
The distance of tags to reference point is
T = S − L
(5.30)
where L is the deterministic distance of laser ranging sensor to reference point and
S is the distance of laser ranging sensor to tags.
The distance of ith RFID antenna to tag is
R i =
T
2
+ H
2
i
1/2
(5.31)
where H i is the distance of ith RFID antenna to reference point. Once the antennas of
reader are fixed on the antenna stand, the distance of ith RFID antenna to reference
point is measured manually and then input to the main program. In whole measurement, the distance is constant. In practice, the boxes are set to the same and the tags
are on the front of the boxes.
5.2.2 Position Location of Tags
The purpose of image recognition is to identify target automatically. In image recognition system, the quality of images is improved and the target is identified or classified.
The mathematical morphology is used to extract image components that are useful
in the representation and description of region shape (such as boundaries, skeletons,
and convex hull).
Dilation and erosion are the basic elements of mathematical morphology. In this
paper, we use dilation and erosion to remove the noise of image. With A and B as
sets in Z
2 , the dilation of A by B, denoted A ⊕ B, is defined as [30]
A ⊕ B = {z|(B) z ∩ A = ∅}
(5.32)
For sets A and B in Z
2 , the erosion of AB is defined as
AB = {z|(B) z ⊆ A }
(5.33)