WEBVTT

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In my lab, we build
autonomous aerial robots

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like the one you see flying here.

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Unlike the commercially available drones
that you can buy today,

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this robot doesn't have any GPS on board.

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So without GPS,

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it's hard for robots like this
to determine their position.

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This robot uses onboard sensors,
cameras and laser scanners,

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to scan the environment.

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It detects features from the environment,

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and it determines where it is
relative to those features,

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using a method of triangulation.

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And then it can assemble
all these features into a map,

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like you see behind me.

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And this map then allows the robot
to understand where the obstacles are

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and navigate in a collision-free manner.

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What I want to show you next

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is a set of experiments
we did inside our laboratory,

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where this robot was able
to go for longer distances.

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So here you'll see, on the top right,
what the robot sees with the camera.

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And on the main screen...

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And of course this is sped up
by a factor of four...

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On the main screen you'll see
the map that it's building.

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So this is a high-resolution map
of the corridor around our laboratory.

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And in a minute
you'll see it enter our lab,

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which is recognizable
by the clutter that you see.

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(Laughter)

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But the main point I want to convey to you

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is that these robots are capable
of building high-resolution maps

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at five centimeters resolution,

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allowing somebody who is outside the lab,
or outside the building

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to deploy these
without actually going inside,

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and trying to infer
what happens inside the building.

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Now there's one problem
with robots like this.

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The first problem is it's pretty big.

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Because it's big, it's heavy.

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And these robots consume
about 100 watts per pound.

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And this makes for
a very short mission life.

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The second problem

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is that these robots have onboard sensors
that end up being very expensive...

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A laser scanner, a camera
and the processors.

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That drives up the cost of this robot.

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So we asked ourselves a question:

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what consumer product
can you buy in an electronics store

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that is inexpensive, that's lightweight,
that has sensing onboard and computation?

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And we invented the flying phone.

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(Laughter)

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So this robot uses a Samsung Galaxy
smartphone that you can buy off the shelf,

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and all you need is an app that you
can download from our app store.

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And you can see this robot
reading the letters, "TED" in this case,

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looking at the corners
of the "T" and the "E"

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and then triangulating off of that,
flying autonomously.

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That joystick is just there
to make sure if the robot goes crazy,

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Giuseppe can kill it.

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(Laughter)

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In addition to building
these small robots,

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we also experiment with aggressive
behaviors, like you see here.

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So this robot is now traveling
at two to three meters per second,

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pitching and rolling aggressively
as it changes direction.

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The main point is we can have
smaller robots that can go faster

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and then travel in these
very unstructured environments.

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And in this next video,

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just like you see this bird, an eagle,
gracefully coordinating its wings,

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its eyes and feet
to grab prey out of the water,

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our robot can go fishing, too.

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(Laughter)

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In this case, this is a Philly cheesesteak
hoagie that it's grabbing out of thin air.

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(Laughter)

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So you can see this robot
going at about three meters per second,

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which is faster than walking speed,
coordinating its arms, its claws

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and its flight with split-second timing
to achieve this maneuver.

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In another experiment,

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I want to show you
how the robot adapts its flight

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to control its suspended payload,

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whose length is actually larger
than the width of the window.

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So in order to accomplish this,

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it actually has to pitch
and adjust the altitude

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and swing the payload through.

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But of course we want
to make these even smaller,

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and we're inspired
in particular by honeybees.

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So if you look at honeybees,
and this is a slowed down video,

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they're so small,
the inertia is so lightweight...

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(Laughter)

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that they don't care...

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They bounce off my hand, for example.

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This is a little robot
that mimics the honeybee behavior.

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And smaller is better,

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because along with the small size
you get lower inertia.

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Along with lower inertia...

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(Robot buzzing, laughter)

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along with lower inertia,
you're resistant to collisions.

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And that makes you more robust.

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So just like these honeybees,
we build small robots.

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And this particular one
is only 25 grams in weight.

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It consumes only six watts of power.

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And it can travel
up to six meters per second.

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So if I normalize that to its size,

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it's like a Boeing 787 traveling
ten times the speed of sound.

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(Laughter)

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And I want to show you an example.

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This is probably the first planned mid-air
collision, at one-twentieth normal speed.

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These are going at a relative speed
of two meters per second,

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and this illustrates the basic principle.

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The two-gram carbon fiber cage around it
prevents the propellers from entangling,

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but essentially the collision is absorbed
and the robot responds to the collisions.

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And so small also means safe.

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In my lab, as we developed these robots,

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we start off with these big robots

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and then now we're down
to these small robots.

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And if you plot a histogram
of the number of Band-Aids we've ordered

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in the past, that sort of tailed off now.

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Because these robots are really safe.

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The small size has some disadvantages,

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and nature has found a number of ways
to compensate for these disadvantages.

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The basic idea is they aggregate
to form large groups, or swarms.

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So, similarly, in our lab,
we try to create artificial robot swarms.

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And this is quite challenging

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because now you have to think
about networks of robots.

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And within each robot,

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you have to think about the interplay
of sensing, communication, computation...

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And this network then becomes
quite difficult to control and manage.

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So from nature we take away
three organizing principles

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that essentially allow us
to develop our algorithms.

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The first idea is that robots
need to be aware of their neighbors.

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They need to be able to sense
and communicate with their neighbors.

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So this video illustrates the basic idea.

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You have four robots...

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One of the robots has actually been
hijacked by a human operator, literally.

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But because the robots
interact with each other,

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they sense their neighbors,

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they essentially follow.

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And here there's a single person
able to lead this network of followers.

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So again, it's not because all the robots
know where they're supposed to go.

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It's because they're just reacting
to the positions of their neighbors.

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(Laughter)

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So the next experiment illustrates
the second organizing principle.

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And this principle has to do
with the principle of anonymity.

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Here the key idea is that

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the robots are agnostic
to the identities of their neighbors.

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They're asked to form a circular shape,

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and no matter how many robots
you introduce into the formation,

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or how many robots you pull out,

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each robot is simply
reacting to its neighbor.

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It's aware of the fact that it needs
to form the circular shape,

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but collaborating with its neighbors

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it forms the shape
without central coordination.

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Now if you put these ideas together,

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the third idea is that we
essentially give these robots

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mathematical descriptions
of the shape they need to execute.

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And these shapes can be varying
as a function of time,

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and you'll see these robots
start from a circular formation,

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change into a rectangular formation,
stretch into a straight line,

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back into an ellipse.

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And they do this with the same
kind of split-second coordination

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that you see in natural swarms, in nature.

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So why work with swarms?

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Let me tell you about two applications
that we are very interested in.

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The first one has to do with agriculture,

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which is probably the biggest problem
that we're facing worldwide.

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As you well know,

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one in every seven persons
in this earth is malnourished.

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Most of the land that we can cultivate
has already been cultivated.

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And the efficiency of most systems
in the world is improving,

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but our production system
efficiency is actually declining.

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And that's mostly because of water
shortage, crop diseases, climate change

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and a couple of other things.

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So what can robots do?

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Well, we adopt an approach that's
called Precision Farming in the community.

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And the basic idea is that we fly
aerial robots through orchards,

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and then we build
precision models of individual plants.

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So just like personalized medicine,

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while you might imagine wanting
to treat every patient individually,

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what we'd like to do is build
models of individual plants

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and then tell the farmer
what kind of inputs every plant needs...

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The inputs in this case being water,
fertilizer and pesticide.

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Here you'll see robots
traveling through an apple orchard,

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and in a minute you'll see
two of its companions

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doing the same thing on the left side.

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And what they're doing is essentially
building a map of the orchard.

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Within the map is a map
of every plant in this orchard.

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(Robot buzzing)

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Let's see what those maps look like.

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In the next video, you'll see the cameras
that are being used on this robot.

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On the top-left is essentially
a standard color camera.

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On the left-center is an infrared camera.

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And on the bottom-left
is a thermal camera.

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And on the main panel, you're seeing
a three-dimensional reconstruction

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of every tree in the orchard
as the sensors fly right past the trees.

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Armed with information like this,
we can do several things.

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The first and possibly the most important
thing we can do is very simple:

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count the number of fruits on every tree.

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By doing this, you tell the farmer
how many [fruits] she has in every tree

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and allow her to estimate
the yield in the orchard,

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optimizing the production
chain downstream.

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The second thing we can do

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is take models of plants, construct
three-dimensional reconstructions,

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and from that estimate the canopy size,

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and then correlate the canopy size
to the amount of leaf area on every plant.

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And this is called the leaf area index.

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So if you know this leaf area index,

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you essentially have a measure of how much
photosynthesis is possible in every plant,

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which again tells you
how healthy each plant is.

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By combining visual
and infrared information,

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we can also compute indices such as NDVI.

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And in this particular case,
you can essentially see

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there are some crops that are
not doing as well as other crops.

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This is easily discernible from imagery,

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not just visual imagery but combining

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both visual imagery and infrared imagery.

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And then lastly,

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one thing we're interested in doing is
detecting the early onset of chlorosis...

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And this is an orange tree...

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Which is essentially seen
by yellowing of leaves.

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But robots flying overhead
can easily spot this autonomously

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and then report to the farmer
that he or she has a problem

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in this section of the orchard.

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Systems like this can really help,

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and we're projecting yields
that can improve by about ten percent

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and, more importantly, decrease
the amount of inputs such as water

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by 25 percent by using
aerial robot swarms.

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A second application area
is in first response.

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This is a picture of the Penn campus,

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actually south of the Penn campus,
the South Bank.

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I want you to imagine a setting

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where there might be an emergency call
from a building,

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a 911 call.

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By the time the police get there,
it might take a valuable 5-10 minutes.

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But imagine now, robots respond.

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And you have a whole swarm of them,

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flying to the scene autonomously,
just triggered by a 911 call

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or by a dispacher.

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By the way, if someone is here
from the FAA,

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this was actually shot in South America.

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(Laughter)

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So, robots arrive at the scene,

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and they're all equipped
with downward facing cameras,

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and they can monitor the scene.

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And they do this autonomously,

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so by the time a human first responder
or a police officer gets there,

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they have access
to all kinds of information.

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So on the top left,
you see the central screen

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that a dispacher might see,

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which is telling her
where the robots are flying

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and how they're encircling the building.

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And the robots are autonomously deciding
which ingress poins

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should be assigned to what robot.

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On the top right, you essentialy see
images from the robots

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being assembled into a mosaic.

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Which again, gives the first responder
some idea

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of what activity is going on at the scene.

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And on the bottom, you can see
a three-dimensional reconstruction

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that we developed on the fly.

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In addition to working outside buidlings,

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we're also interested
in going inside buidlings,

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and I want to show you
an experiment we did three years ago

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where our aerial robot -
one exactly like this one -

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is collaborating with a ground robot,

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in this case it's actually hitching a ride
with a ground robot,

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because it's programmed to be lazy,
to save power.

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So, as it goes up,
the two travel in tandem,

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and this is a collapsed building
after an earthquake,

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this is shortly after the 2011 earthquake
in Fukushima.

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When the robots get stuck
in front of a collapsed doorway,

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our tobot takes off
and is able to fly over the obstacles

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around the obstacles,

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and generate a three-dimensional map,
in this case of a bookcase.

00:15:39.072 --> 00:15:41.436
And it's able to see
what's on the other side.

00:15:41.458 --> 00:15:45.513
Something fairly simple,
but it's hard to do with ground robots,

00:15:45.530 --> 00:15:49.045
and certainly hard to do with humans
when there's potential for harm.

00:15:50.151 --> 00:15:54.085
So these two robots
are collaboratively building these maps,

00:15:54.617 --> 00:15:57.188
and, again,
when the first responders come,

00:15:57.213 --> 00:15:59.480
they can be quick with these maps.

00:15:59.630 --> 00:16:02.630
So let me show you
what some of these maps look like.

00:16:02.720 --> 00:16:04.545
So this is a three storey building,

00:16:04.570 --> 00:16:07.537
the seventh, eighth and what remains
of the ninth floor on top,

00:16:07.562 --> 00:16:11.164
and we were able to construct this map
using this team of two robots,

00:16:11.188 --> 00:16:13.455
operating in tandem, autonomously.

00:16:14.032 --> 00:16:17.528
However, this experiment took us
two and a half hours to complete.

00:16:18.569 --> 00:16:20.751
Now, no first responder
is going to give you

00:16:20.776 --> 00:16:23.124
two and a half hours
to do this experiment,

00:16:23.149 --> 00:16:25.228
before he or she wants to rush in.

00:16:25.252 --> 00:16:27.283
They might give you
two and a half minutes,

00:16:27.292 --> 00:16:29.684
you'll be lucky if you get
two and a half seconds.

00:16:29.700 --> 00:16:31.874
But now that's where robot swarms
come in.

00:16:31.883 --> 00:16:34.533
Imagine if you could send in
a hundred of these robots,

00:16:34.538 --> 00:16:36.711
like the little ones
that we were just flying,

00:16:36.711 --> 00:16:39.625
and imagine they went in
and generated maps like this

00:16:39.649 --> 00:16:42.649
well before humans actually arrived
on the scene.

00:16:43.189 --> 00:16:46.189
And that's the vision
we're working towards.

00:16:47.570 --> 00:16:48.837
So, let me conclude

00:16:49.994 --> 00:16:52.993
with a movie -
a Warner brothers movie -

00:16:53.228 --> 00:16:56.228
of an upcoming -
right next in your theatre,

00:16:57.138 --> 00:16:59.082
The Swarm!
The Swarm is coming!

00:16:59.098 --> 00:17:01.934
And I love this poster,
actually if you've seen the movie,

00:17:01.990 --> 00:17:04.057
you're probably dating yourself

00:17:04.738 --> 00:17:07.689
if you have not seen the movie,
I encourage you not to see it,

00:17:07.689 --> 00:17:08.836
it's a terrible movie,

00:17:08.836 --> 00:17:09.885
(Laughter)

00:17:09.885 --> 00:17:13.347
It's about killer bees, attacking men
and killing them and so on.

00:17:13.363 --> 00:17:16.490
But everything about this poster is true,
which is why I like it.

00:17:16.498 --> 00:17:19.369
"Its size is immeasurable" -
I hope I've convinced you

00:17:19.369 --> 00:17:21.237
that "its power is limitless",

00:17:21.307 --> 00:17:22.917
and even this last bit is true,

00:17:22.934 --> 00:17:25.862
"its enemy is man",
the technology is here today

00:17:25.862 --> 00:17:27.905
and it's people like us that are standing

00:17:27.905 --> 00:17:30.605
between this technology
and its applications.

00:17:30.625 --> 00:17:33.625
The swarm is coming,
this is not science fiction,

00:17:34.109 --> 00:17:36.309
in fact, this is what lies ahead.

00:17:36.734 --> 00:17:42.299
Lastly, I want you to applaud
the people who actually create the future,

00:17:42.647 --> 00:17:47.328
Yash Mulgaonkar, Sikang Liu
and Giuseppe Loianno,

00:17:47.416 --> 00:17:50.416
who are responsible for the three
demonstrations that you saw.

00:17:51.103 --> 00:17:52.279
Thank you.

00:17:52.328 --> 00:17:55.328
(Applause)