In the field of Gesture Recognition and Speech Recognition (using HMM classifiers), do multiple HMM classifiers (one for each class) share common Codebook (i.e common set of symbols) in Vector Quantization?
If that is not the case, how does the test/classification stage work?
To which Codebook the test input vector belongs to (we need this to determine the symbol, in turn which is fed to the HMM for classification)?
Some background info:
- One of the most earliest works done in Action Recognition used different set of symbols for each of the HMM classifier.
- This journal in speech recognition by Rabiner suggest using common Codebook (with different HMM classifiers) for identifying 10 digits uttered by large number of users (in page 12),