ted hench imaging. objectives determine target locations to within 50 feet targets are all unique,...
TRANSCRIPT
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Ted Hench
Imaging
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Objectives
Determine target locations to within 50 feetTargets are all unique, but similarLarge area to searchLimited time
How are we going to do this?
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Image of plane flyingLive Video
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Image of camera being controlled
Control
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Image of picture being taken
Storage
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Retrieval
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Analysis
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Why are we doing things this way?
Low Cost
FeasibilityIsolated aircraft subsystemItself composed of isolated subsystems
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Why do we need to analyze pictures on the ground?
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Alternatives to human analysis? Computer Image Recognition
Extremely Hard to implementUnreliableWeight and Cost of Computer
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Why are we waiting for the plane to land get our images back?
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Alternatives to Image Storage Transmitting Images Back
The digital radios (modems) are too slow○ Also unreliable
Wi-Fi links are expensive○ Require a network-able computer or camera○ Even less reliable
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Why do we need to store digital images?
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Why do we need to store digital images?
Analog video transmission has limited resolution
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Image of plane flyingWhy should the aircraft transmit live video then?
What does it require?
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Alternatives to Video Transmission
Pattern Recognition ( Cueing )Hard to implementUnreliable
Take Constant PicturesTakes time to sift throughTeam doesn’t have much to do while the
plane is airborne anyway○ Can try to identify targets
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What Does Transmission Require?
Not MuchRadio
○ Small○ Inexpensive
Camera○ Re-using digital camera
Power○ Shared with other devices
100 grams of additional lift
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Why is a pivoting camera necessary?
What does it require?
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Area Viewed vs. Resolution How do we cover more ground?
Fly higher or use a lens with a wider field of view○ Targets represented by fewer pixels - harder to identify
Flying faster○ Images are blurred○ Constraints on aircraft design
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Alternatives to manual control? Fixed Camera Position
Area being photographed depends on the plane’s orientation
Requires that the aircraft sweep the area○ Takes time
Pattern Recognition and TrackingHard to implementUnreliable
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What Does Manual Control Require?
Servos for panning Gimbal or mounting that allows for 1-2
axes of rotation System/Radio for controlling the servos
Direct RC controllerControlled by onboard processor
Minimal cost and weight regardless
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What We’ve Done This Semester
Video/analog radios picked out Control servos and camera with a
microcontroller or RC controller Can sample aircraft orientation and
transmit to base for use with images Calculate the GPS location of object given
camera orientation and location of object in picture
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What’s yet to be done
Control servos via digital communicationRequires fewer servosCan more accurately determine camera
orientation
Store sensor data onboardFrees up one radio
Create a proper mount for the camera
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Questions?
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Gimbaled Camera