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Ph.D Dissertation Defense: Yaming Wang
Wednesday, April 25, 2018
12:00 p.m.-2:00 a.m.
AVW 2460
For More Information:
Maria Hoo
301 405 3681
mch@umd.edu

ANNOUNCEMENT:  Ph.D Dissertation Defense
 
Name: Yaming Wang
 
Committee:
Professor Larry Davis, Chair
Professor David Jacobs
Professor Joseph JaJa
Professor Min Wu
Professor Rama Chellappa, Dean’s Representative
 
Date/time:  Wednesday, April 25th, 2018 at  12:00 pm - 2:00 pm
 
Location: AVW 2460
 
Title: Discriminative Feature Learning with Application to Fine-grained Recognition
 
Abstract:
 
For various computer vision tasks, finding suitable feature representations is fundamental. Fine-grained recognition, distinguishing sub-categories under the same super-category (e.g., bird species, car makes and models etc.), serves as a good task to study discriminative feature learning for visual recognition task. The main reason is that the inter-class variations between fine-grained categories is very subtle and even much smaller than intra-class variations caused by pose and deformation. 
 
This thesis focuses on tasks mostly related to fine-grained categories. After briefly discussing our earlier attempt to capture subtle visual differences using sparse/low-rank analysis, the main part reflects the trends in the past a few years as deep learning prevails.
 
In the first part of the thesis, we address the problem of fine-grained recognition via a patch-based framework built upon Convolutional Neural Network (CNN) features. We introduce triplets of patches with two geometric constraints to improve the accuracy of patch localization, and automatically mine discriminative geometrically-constrained triplets for recognition.
 
In the second part we begin to learn discriminative features in an end-to-end fashion. We propose a supervised feature learning approach, Label Consistent Neural Network, which enforces direct supervision in late hidden layers. We associate each neuron in a hidden layer with a particular class and encourage it to be activated for input signals from the same class by introducing a label consistency regularization. This label consistency constraint makes the features more discriminative and tends to faster convergence.
 
The third part proposes a more sophisticated and effective end-to-end network specifically designed for fine-grained recognition, which learns discriminative patches within a CNN. We show that patch-level learning capability of CNN can be enhanced by learning a bank of convolutional filters that capture class-specific discriminative patches without extra part or bounding box annotations. Such a filter bank is well structured, properly initialized and discriminatively learned through a novel asymmetric multi-stream architecture with convolutional filter supervision and a non-random layer initialization. 
 
In the last part we goes beyond obtaining category label and study the problem of continuous 3D pose estimation for fine-grained object categories. We augment three existing popular fine-grained recognition datasets by annotating each instance in the image with corresponding fine-grained 3D shape and ground-truth 3D pose. We cast the problem into a detection framework based on Faster/Mask R-CNN. To utilize the 3D information, we also introduce a novel 3D representation, named as location field, that is effective for representing 3D shapes.



 


This Event is For: Graduate • Faculty

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