Forms often contain preprinted elements as field rakes (or combs) or character rakes (or combs).

Scanned document in some cases, also have horizontal or vertical lines due to the banding or folding of papers.

Dealing with those artifacts is a challenging task for a system that tries to detect rakes during processing business documents.

The document structure analysis and character recognition are usually done in several phases: scanning thresholding skew detection and correction despeckle or speckle removal line removal border removal detection of preprinted elements (like boxes or rakes) page orientation detection and correction layout analysis classification character recognitionEach step must be completed well enough for the performance of the sequence and result to be successful.

RakeHelper searches for rakes the aim being the extraction and recognition of the characters.

Also rakes can be used as features in the step of form identification and recognition as anchor elements.