These Perl modules parse CJK characters and generate roman letteres.

Lingua::ZH::Romanize::Pinyin

This romanizes Chinese characters, both of Mandarin and Cantonese.

http://search.cpan.org/dist/Lingua-ZH-Romanize-Pinyin/lib/Lingua/ZH/Romanize/Pinyin.pm

Lingua::JA::Romanize::Japanese

This romanizes Japanese characters, both of Kanji and Kana.

http://search.cpan.org/dist/Lingua-JA-Romanize-Japanese/lib/Lingua/JA/Romanize/Japanese.pm

Lingua::KO::Romanize::Hangul

This romanizes Korean characters, Hangul.

http://search.cpan.org/dist/Lingua-KO-Romanize-Hangul/lib/Lingua/KO/Romanize/Hangul.pm