Specifies precision of outline detection.

Values of this enumeration:

• SuperFast - Very fast outline detection. Useful for very good quality codes.
• Fast - Fast outline detection. Good enough when Quite Zone is not contaminated.
• Precise - Precise outline detection. Also requires clean Quite Zone, but produces more precise outline.
• Strict - Combines Fast and Precise methods.
• Extended - As Strict, but also adds a method for contaminated Quite Zone.