Overview
Syllabus
Intro
Difficulties: within class variations
Bag-of-features - Origin: texture recognition
Bag of Words Model
Bag-of-features - Origin: bag-of-words (text)
Bag-of-features for image classification
feature extraction
Dense features
Step 2: Quantization
K-means Clustering: Step 1 Algorithm: kmeans, Distance Metric Euclidean Distance
Example: 3-means Clustering
Examples for visual words
Training data Vectors are histograms, one from each training image
Examples for misclassified images
Evaluation of image classification
PASCAL 2007 dataset
Results for PASCAL 2007
Step 3: Classification
Image representation
Spatial pyramid matching
Spatial pyramid representation
Scene classification
Retrieval examples
Category classification - CalTech 101
Discussion
Weizmann Action Dataset
KTH Data Set
UCF Sports Action Dataset
IXMAS Multi-view Data Set
UCF YouTube Action Dataset (UCF-11)
Bag of Visual Words model (II)
Histogram of Optical flow (HOF)
HOF Steps
Taught by
UCF CRCV