[talks] Z Wang preFPO

Melissa Lawson mml at CS.Princeton.EDU
Mon May 23 16:35:17 EDT 2011


Zhe Wang will present his preFPO on Friday May 27 at 2PM in Room 402.  The 
members of his committee are:  Kai Li, advisor; Moses Charikar and Olga Troyanskaya, 
readers; Jennifer Rexford and Andrea LaPaugh; nonreaders.  Everyone is invited to 
attend his talk.  His abstract follows below.
--------------------------
Title: Designing similarity search systems for multimodal 
data                 
                                                                                

As images, videos and all kinds of non-text sensory data have 
taken            
the majority of the storage space, how to efficiently 
index                    
and search them becomes an issue. The query by example kind of 
content         
based search method has become more popular and often can be used 
to           
compliment the existing search method. We have designed 
multiple               
search system to demonstrate the content based search capability 
and           
would discuss our experience about building such 
systems.                      
                                                                                

First we describe VFerret system where we combine the image 
visual             
feature with audio features for personal video search. Second, 
we              
explore different aggregation methods to aggregate 
results                     
from multiple features in a system to detect image spam emails. In 
the         
last system, we design a new method to combine image similarity 
search         
with product navigation to help user to find desired product in 
the            
product category 
tree.                                                         
                                                                                

One of the common problem for the similarity search system is 
the              
space utilization for the feature vectors used to 
represent                    
objects. Our group had developed sketch as a compact data structure 
to         
alleviate such problem. In order to use the sketch 
effectively,                
I have worked out a method to model the sketch and predict the 
best            
parameters to use given a sample 
dataset.                                      
                                                                                

Our experience in integrating the similarity search capability 
into            
different kinds of system show that the content based search can 
be            
an effective method to enhance the existing systems. By 
creatively             
exploit multiple modality from the data, we demonstrate much 
better            
performance than the traditional systems.   




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