How to proceed for BOW creation From sift features I extracted sift feature to construct a bag-of-words model. I did the following to extract the feature vector:


Extracted features from the key frames.
After the feature extraction I tried using Principle Component Analysis to reduce the size of my features.


Query: What further pre-processing steps should I take before creating a codebook out of the set of features extracted ?
There is now support for the bag-of-words model in the Computer Vision System Toolbox for MATLAB.