This cleanup method smooths the edges of characters to they are easier to recognize. It is common for character sharpness to be lost when a document is faxed or printed on a printer that is low in ink.
As a result, this cleanup method looks at the characters and intelligently fills in blank areas, removes jagged corners, and removes some background debris before recognition is performed. This can improve recognition and extraction results.
Use this method for documents that contain machine printed text that returns poor recognition results. This is commonly used with the Smooth and Clean or the Smooth + Clean + Preserve cleanup methods.