Unsupervised Learning of Object Descriptors and Compositions
Xingyao Ye · eScholarship (California Digital Library) · 2012
This thesis presents methods and results to solve the problem of joint object recognition and reconstruction. The proposed solution is a dictionary of deformable image patches and a hierarchical model encoding spatial compositions. Both the dictionary and the composition model are learned from data without supervision. The patch dictionary is shown to achieve state-of-art performance on digit recognition while capable of high-quality reconstruction. The hierarchical model is shown to account for human chunk learning behavior not captured by previous theories. Both learning algorithms are significantly faster and easier to use than previous methods of similar purpose.