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The types of characters to include in the character set used for recognition. Specify the types of characters that you expect to appear in your media. If you know that your media only contains certain types of characters, such as uppercase characters, limit recognition to these characters because this can increase accuracy.
You can specify a list of types that includes one or more of the following values.
alpha- includes both lower case and upper case
special- includes currency, mathematical, and other non-punctuation symbols
symbol- includes anything that the
digitoptions do not include. This is equivalent to
Separate multiple values with commas (there must be no space before or after a comma).