Pinyi : A Chinese Romanization System | pizin yi ： yi zhozeng han zih la direireng huazei fang ahn

Goal

One-to-one mapping between a Chinese character and a code

Based on Pinyin system

Add additional letters with sounds like "yi" or "ee" after the vowel, so as to make less impact to spelling

Use Wubi to generate the additional letters

Chinese characters with higher frequency should have zero or less additional letters

Generate a unique Wubi for each character, using the data source A.

For characters with the same Wubi code, add extra string in the order as:

a;b;c;d;e;f;g;h;i;j;k;l;m;n;o;p;q;r;s;t;u;v;w;x;y;aa;ba;ca;da;ea;fa;ga;ha;ia;ja;ka;la;ma;na;oa;pa;qa;ra;sa;ta;ua;va;wa;xa;ya

Choose a Pinyin for each character, using the data source B and data source C.

If a character is in data source C, choose the first Pinyin.

If a character is not in data source C, and has a Pinyin using tone 5, chose the one with tone 5

Otherwise, choose the first PinYin in alphabetical order

Go through each characters in the order of data source B:

Define prefix the leading consonant and the vowel of Pinyin

Define suffix the trailing consonant ("n", "ng", "r"), and convert "r" to "l" (for avoid later conflicts).

Try each possible candidate code for the character, to pick the first one which has not been used before it.

The order of candidate are:

prefix + suffix	Pinyin without tone
prefix + encoded[wubi[0]] + suffix	Pinyin without tone, inserted the "yi"-code of one Wubi letter
prefix + encoded[wubi[0]] + encoded[wubi[1]] + suffix	Pinyin without tone, inserted the "yi"-codes of two Wubi letters
prefix + encoded[wubi[0]] + encoded[wubi[1]] + ... + suffix	Pinyin without tone, inserted the "yi"-codes of more Wubi letters
prefix + encoded[wubi[0]] + encoded[wubi[1]] + ... + encoded[extra] + suffix	Pinyin without tone, inserted the "yi"-codes of all Wubi letters, and extra string

Encode Table

Extra strings are:

a;b;c;d;e;f;g;h;i;j;k;l;m;n;o;p;q;r;s;t;u;v;w;x;y;aa;ba;ca;da;ea;fa;ga;ha;ia;ja;ka;la;ma;na;oa;pa;qa;ra;sa;ta;ua;va;wa;xa;ya

B. Frequency and Pinyin of Chinese characters from http://lingua.mtsu.edu/chinese-computing/statistics/char/list.php?Which=MO (Modern Chinese Character Frequency List by Jun Da (jda@mtsu.edu))