Reading two Patents about Chinese Query Refinement by Google Inc.

1. Systems and methods for translating Chinese pinyin to Chinese characters [Link]
       a). Systems and methods to process and translate pinyin to Chinese characters and words are disclosed.
       b). 2. Systems and methods for spell correction of non-roman characters and words[Link];
      a). Systems and methods to process and correct spelling errors for non-Roman based words such as in Chinese, Japanese, and Korean languages using a rule-based classifier and a hidden Markov model are disclosed.


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