team4 final presentation2 -...
TRANSCRIPT
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The Visual Targeting TurretFinal Presentation
Jason Lam
John Lee
Jonathan Rothberg
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Overview
Objectives and Motivation Design SpecificationsDesign Approach, Validation and Obstacles
HardwareMathematical ModelingImage ProcessingParameter IdentificationControl Design
Results / Demonstration AssessmentConclusions
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Objectives
Visually track a moving target on the floor in various lighting conditions
Infrared spectrum Targeting via webcam and laser pointerMATLAB image processing
Target travels freely around the visual systemMust be within the camera’s range of view (180° Pan)
Shoot Target (RC Car)Target has laser detection capabilityTarget signals a hit with a buzzer and LED
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Motivation
Defense systemsNeutralizing threats without risking human lifeNighttime operation
Civilian and commercial applicationsTraffic controlSecurity systems
EntertainmentAutomated Laser-Tag player
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SpecificationsCar Velocity: 0.684788 m/s (weighted car), 1.3252 m/s (non-weighted car)Height
Tilt Axle: 0.92 m Tilt Axle to camera: 3.4 cmTilt Axle to laser pointer: 5.7 cm
Motion range: Tilt: 30.5° to 68.5° (from the horizontal plane)Pan: 180°
Degree of view:Pan: 18.05° from centerTilt: 27.5345° from center
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Specifications (Controller)
Settling time = 0.17 sec Less than average image processing time
Overshoot < 1%Slight overshoot may behave as a “predictive”algorithm
Steady State Error = 0
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Design Approach: HardwareLaser Detection Circuit
Infrared emitters and red laser photodiodes
Variable SensitivityStatus LED and buzzerLayout
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Design Approach: Hardware
Mounting System to Pan-Tilt Assembly
Minimize inertiaRigid mount to maintain geometry
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Obstacles: Hardware
Target:Target speedLight reflection
Mounting:FabricationPrecision
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Obstacles: Hardware
Proposed Design Implemented Design
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Obstacles: Hardware
Maintaining the geometry of implemented design
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Design Approach: Mathematical Modeling
Coordinate System TranslationsNon-linear relationship between tilt and actual distanceDegrees per pixel is linear
Parallax IssuesLaser pointer is above the cameraConvergence point depends on distance from assemblyVirtual Centerpoint System
Tilt compensation
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Design Approach: Image Processing
Maximize frames per secondMinimize distance car travels between framesProvide fast processing of images
Robust and reliableAccurately find moving car 90% - 100% of the time
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Design Approach: Image Processing Design
Direct search of image’s pixel values Collect locations of pixel values above a specified threshold Mean of selected pixel locations determines centroid of target
Target detection accuracy and performanceDetect target based on colorDetect target in dim lighting conditionsCorrectly detect car in noisy environmentOmit slow MATLAB sub-routines
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Design Approach: Image Processing
Streamlined algorithmFrames per second: 10Image processing time: 0.1 seconds on averageAccurately detects target in normal or dim lighting conditions
The elapsed time is 0.151 seconds
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Obstacles: Image Processing
Adequate performanceSlow MATLAB functionsCamera performance under dim lighting conditions
Erroneously tracked laser pointer instead of actual target
Color processing included RedIR LED’s emit blue colorNeed to be only concerned with blue and green
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Modeling and Verificationvia Friction Identification
LLcMLMLLMLLML mglNBNBBNBJNJCCVV
ττ −Θ+=Θ′++Θ′++Θ′′+ )sin(*)sgn()*(*)*(*)*( 2
MLLL NaaI τ=Θ′+Θ′+Θ′′ )sgn(*** 21
12 /))0699.0(( aaVNL −=Θ′
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Pan Friction Identification
Velocity vs. Time
Pan Negative Range:-2.6 V to -1.85 V (impulse of -3 V)
Pan Positive Range:
2.4 V to 1.75 V (impulse of 3 V)
Increments of 0.05 V
0 5 10 15 20 25 30-40
-30
-20
-10
0
10
20
30
40Velocity vs. Time Family of Curves
Time (sec)
Vel
ocity
(rad
/sec
)
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Pan Friction Identification
Viscous Friction:Positive:0.0010 Nm*s/rad
Negative:0.0013 Nm*s/rad
Coulomb Friction:Positive:0.1341 Nm
Negative:-0.1345 Nm
-40 -30 -20 -10 0 10 20 30 40-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2Friction Identification Data
Steady State Theta Dot (rad/sec)
App
lied
Torq
ue (N
-m)
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Tilt Friction Identification
Velocity vs. Time
Tilt Negative Range:-2.3 V to -1.5 V (impulse of -2.5 V)
Tilt Positive Range:
1.9 V to 1.4 V (impulse of 2.1 V)
Increments of 0.05 V
0 5 10 15 20 25 30-40
-30
-20
-10
0
10
20
30
40Velocity vs. Time Family of Curves
Time (sec)
Vel
ocity
(rad
/sec
)
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Tilt Friction Identification
Viscous Friction:Positive:0.0008 Nm*s/rad
Negative:0.0014 Nm*s/rad
Coulomb Friction:Positive:0.1030 Nm
Negative:-0.1159 Nm
-40 -30 -20 -10 0 10 20 30 40-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15Friction Identification Data
Steady State Theta Dot (rad/sec)
App
lied
Torq
ue (N
-m)
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Modeling and Verificationvia Friction Identification
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Modeling and Verificationvia Friction Identification
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Modeling and Verificationvia Parameter Identification
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Modeling and Verificationvia Parameter Identification
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Modeling and Verificationvia Parameter Identification
0 5 10 15 20 25 30-50
-40
-30
-20
-10
0
10
20
30
40
50
Time (sec)
Vel
ocity
(rad
/sec
)
Open-Loop Response (Chirp) - Actual and Simulated
Simulated
Actual
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Controller Design
Pan Axis
Mo = 0.3906tp = 0.1850tr = 0.0680ts = 0.1160ess = 0.3906
0 0.5 1 1.5 2 2.5 3 3.50
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
time (s)
Vol
tage
(V)
Closed loop system response to pi/4 step input
actualdesired
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Controller Design
Tilt Axis
Mo = []tp = 2.3950tr = 0.0868ts = 0.1750ess = 0.3906
0 500 1000 1500 2000 2500 3000 35000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
time (s)
Vol
tage
(V)
Closed loop system response to a pi/4 step input - tilt
actualdesired
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Response to a Moving Target Demonstration Run
0 1 2 3 4 5 6 7 8-1.6
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
time (s)
posi
tion
(thet
a)
Desired vs Actual Response to a Demo Run - Pan
actualdesired
0 1 2 3 4 5 6 7 8-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4Desired vs. Actual Response to a Demo Run - Tilt
posi
tion
(thet
a)
time (s)
actualdesired
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The Current vs. Past System Implementation
CurrentAble to achieve more than 5 frames/sec
PastTarget needs to stop between iterations to allow the camera to capture the current target position
The Difference – memory storageNew implementation integrates system into one Simulink model, excluding the image processing functionOld implementation runs the system in two models in order to store telemetry values
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New System Implementation
6pan angle input
5ti l t angle input
4pan thetadot
3ti lt thetadot
2current pan angle
1current ti lt angle
127
yLoc on screen
160
xLoc on screen
In1 Out1
ti l t PID controller
In1 Out1
pan PID controller
In1 Out1
hold pan angle
1
flag
z
1
Unit Delay1
z
1
Unit Delay
PCIM-DAS1602/16ComputerBoardsAnalog Output
1
2
PCIM-DAS1602 16
PCI-QUAD04Comp. BoardsInc. Encoder
Count
PCI-QUAD04 1
PCI-QUAD04Comp. BoardsInc. Encoder
Count
PCI-QUAD04
1/0.001
Gain3
2*pi/(1024*4)
Gain2
1/0.001
Gain1
2*pi/(1024*4)
Gain
tilt_angle
x_px
y _px
pan_angle
desired_tilt
desired_pan
fcn
Desired Pan-Tilt Angles for (x, y) px on Screen
In1 Out1
hold ti l t angle
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Old Implementation – part 1
6tilt angle input
5pan angle input
4Out5
3Out4
2current pan angle
1current ti lt angleIn1 Out1
tilt PID controller
In1 Out1
pan PID controller
desired ti lt angle difference
desired pan angle difference
z
1
Unit Delay1
z
1
Unit Delay
PCIM-DAS1602/16ComputerBoardsAnalog Output
1
2
PCIM-DAS1602 16
PCI-QUAD04Comp. BoardsInc. Encoder
Count
PCI-QUAD04 1
PCI-QUAD04Comp. BoardsInc. Encoder
Count
PCI-QUAD04
1/0.001
Gain3
2*pi/(1024*4)
Gain2
1/0.001
Gain1
2*pi/(1024*4)
Gain
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Old Implementation – part 2
The old tilt angle is stored in MATLABThe desired pan and tilt is dependent on the current tilt angle, and it is necessary to stop (tg) before that value can be stored
2Out2
1Out1
yLoc
y px
xLoc
x px
old_ti lt
old ti l t angle
0
object distance
0
desired tilt rad
0
desired pan rad
current_til t
current ti l t angle
current_pan
current pan angle
old_tilt
tilt_angle
x_px
y _px
pan_angle
desired_tilt_dif f
desired_pan_dif f
camera_dist
fcn
Desired Pan-Tilt Angles for (x, y) px on Screen
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Results / Demonstration
Stationary Demo
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Results / Demonstration
Stationary Demo: Camera screenshots
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Results / Demonstration
Initial System Implementation (Slow)
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Results / Demonstration
Initial System Implementation (Slow): Camera Screenshots
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Results / Demonstration
Final System Implementation (Fast)
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Assessment
The target is no longer necessary to be weighted down for the system to trackController and image processing is robust enough to hit the targetThe mathematical model accurate enough to hit target within 2 screen captures
Self corrects to the hit the target
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Future Enhancements
A true predictive algorithmAchieve a more continuous camera feedbackEnabling laser to shoot pulses