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How Augmented Reality Works // A Beginner鈥檚 Guide to AR - YouTube
Channel: Reality School
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So you want to become an augmented
reality content creator or maybe you
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want to design or develop custom AR apps.
The only problem is you just don't
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understand how AR works. Well, this video
is for you. Before we get started, I
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actually want to clarify something.
Augmented reality can be subdivided in
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different modalities such as visual,
auditory or haptics. In this video, we're
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going to focus on visual-based AR. If
someone asked you what augmented reality
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was, how would you define it in one
sentence? Pause the video and submit your
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answer in the comments below. This is how
I define augmented reality: AR is a
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digital medium that allows you to
overlay
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virtual content into the physical world
in a way that makes it seem like the
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content is physically there. AR
essentially allows us to merge the
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digital and physical worlds. I bet you're
curious to know how this magical
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technology actually works. It all starts
with AR enabled hardware such as a phone
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or glasses. Most importantly, AR uses a
system of cameras and in some devices
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also time-of-flight 3d depth sensors to
see and understand the physical world
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around you. Imagine entering a room
you've never ever been in, what do you
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tend to do? You look around and make
sense of your surroundings. Your mind
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builds a mental model of the space so
that you can memorize it and recall it
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the next time you enter the same space.
The processor in your head mapped the
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environment using images from the dual
camera system on your face. Similarly,
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your phone or glasses also map your
surrounding environment and build a
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model of it using hardware sensors and
specialized software, in this case
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computer vision and machine learning
software. Now imagine this room again,
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when we move around the room we can
pretty accurately estimate our location
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within it.
This is possible because we take into
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account our relative position to
important features in the room, such as
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the walls, the desk and ultra-wide monitor.
In AR this is referred to as tracking or
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localization. The research community has
a fun word called SLAM which stands for
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Simultaneous Localization and Mapping.
This is what your phone or glasses do
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many times a second.
They map your environment but also keep
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track of where you are in relation to it.
This is so important to understand. Once
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mapping and localization are working
well for a new environment, an AR
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experience can begin. But how does the
placement of AR content actually work?
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When placing AR content, your phone or
glasses really place them in the virtual
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map of the environment. The virtual map, however, is invisible. So that's why it
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looks like the digital content is placed
in the physical world. It is therefore
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really important that our virtual map is
accurate and aligned with its physical
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counterpart. In addition to mapping and
localization, your AR device also senses
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other characteristics of the environment, for example the light intensity and
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color temperature. To make things appear
as realistic as possible, our AR devices
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sense the conditions of our environment
and project that onto our digital
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content as well. And that is how AR works.
It maps your environment and tracks your
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location within it. By doing that, it
allows you to place digital content into
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the physical world in a way that makes
you and those around you believe that it
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is actually there. I hope that you're
super stoked to get started with
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augmented reality. The technology feels
magical and AR has a true potential to
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disrupt every single industry on earth.
I'm willing to bet it'll even spawn new
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industries we haven't yet imagined.
Now I know AR is still very new and
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uncertain, so where do you get started?
Well I'm glad you asked.
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Subscribe to my channel and I will guide
you along the way.
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I will regularly upload content for my
new series AR for Beginners. So tell me,
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what will you create?
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