Comments on "A Separable Low Complexity 2D HMM with Application to Face Recognition
Lu Yu, Lenan Wu · IEEE Transactions on Pattern Analysis and Machine Intelligence · 2007
The separable low complexity 2D HMM proposed in [1] builds on the assumption of conditional independence in the relationship between adjacent blocks. The authors view this assumption as the key assumption to reduce the complexity. In this communication, we show that this key assumption is entirely unnecessary.