6.870 Object Recognition and Scene Understanding
Lecture 12
What happens if we solve object
Do we really need computer vision? We can put
RFID tags to all objects, we can use GPS, …
Sure, we also do not need to understand
locomotion if we are happy being plants.
Some objects might not like to have RFID tags
attached to them. The goal of Vision is to
understand the world, whether the world wants
or not.
Imagine that object recognition and segmentation is solved, so, now what?
Polygons world
Blocks world
“I went to the airport by car, but it took me
a very long time because of the traffic.”
Here word recognition is solved, we can access the meaning of the words. But yet, we are
far from having solved language understanding. Detecting objects is just one small piece of
understanding scenes (it might not even be the hardest). Images and sequence tell stories,
and the structure of those stories are as complex as sentences, paragraphs and books.
Images, with our current set of features,
look more like strange sentences:
I performed the action of going from one place to another in order to reach
the point from where there are devices with wings in which people can get
inside and perform the action of going from one place to another even when
the other place is really far away. To perform the first action, I used another
device that lacks wings and that, instead, has four round things attached to
the sides. It took me a long time to complete the first action as there was
many other people using the same device-with-four-round-things attached to
them performing similar actions to me and trying to occupy the same space
as me.
How to give a talk
How to give a talk
It helps me to go to the conference room a
day earlier and get a sense of the
speakers viewpoint. This way, the day of
the talk it will not be the first time I am in
that situation. It removes uncertainty.
There are no unimportant talks. There are
no big or small audiences. Prepare each
talk with the same enthusiasm.
How to give a talk
Look at the audience! Try not to talk to your laptop
or to the screen. Instead, look at the other
humans in the room.
You have to believe in what you present, be
confident… even if it only lasts for the time of
your presentation.
Do not be afraid to acknowledge limitations of
whatever you are presenting. Limitations are
good. They leave job for the people to come.
Trying to hide the problems in your work will
make the preparation of the talk a lot harder and
your self confidence will be hurt.
How to give a talk
Talk organization: here there are as many theories as there are talks.
Here there are some extreme advices:
1. Go into details / only big picture
2. Go in depth on a single topic / cover as many things as you can
3. Be serious (never make jokes, maybe only one) / be funny (it is just
another form of theater)
Corollary: ask people for advice, but at the end, if will be just you and
the audience. Chose what fits best your style.
What everybody agree on is that you have to practice in advance (the
less your experience, the more you have to practice). Do it with an
audience or without, but practice.
The best advice I got came from Yair Weiss while preparing my job talk:
“just give a good talk”
How to give the project class talk
Initial conditions:
• I started with a great idea
• It did not work
• The day before the presentation I found 40
papers that already did this work
• Then I also realized that the idea was not
so great
How do I present?
• Just give a good talk
Next week
Alec Rivers
Scene Understanding Based on Object Relationships
Gokberk Cinbis
Category Level 3D Object Detection Using View-Invariant Representations
Hueihan Jhuang and Sharat Chikkerur
Video shot boundary detection using GIST representation
Jenny Yuen
Semiautomatic alignment of text and images
Nathaniel R Twarog
A Filtering Approach to Image Segmentation: Perceptual Grouping in Feature Space
Nicolas Pinto
Evaluating dense feature descriptor and multi-kernel learning for face detection/recognition
Tilke Judd and Vladimir Bychkovsky
Identify the same people in different photographs from the same event
Tom Kollar
Context-based object priors for scene understanding
Tom Ouyang
Hand-Drawn Sketch Recognition, A Vision-Based Approach
Papers due this Friday: send PDF by email

6.870 Object Recognition and Scene Understanding