Workflow Guide deskewing

In this processing step, a document image is taken as input and the skew of that page is corrected by annotating the detected angle (-45° .. 45°) and rotating the image. Optionally, also the orientation is corrected by annotating the detected angle (multiples of 90°) and transposing the image. The input images have to be binarized for this module to work.

Available processors

Processor	Parameter	Remarks	Call
ocrd-cis-ocropy-deskew	-P level-of-operation page	Recommended	ocrd-cis-ocropy-deskew -I OCR-D-DENOISE -O OCR-D-DESKEW-PAGE -P level-of-operation page
ocrd-tesserocr-deskew	-P operation_level page	Fast, also performs a decent orientation correction	ocrd-tesserocr-deskew -I OCR-D-DENOISE -O OCR-D-DESKEW-PAGE -P operation_level page

Notes on parameter usage

E.g.

• which parameters do you use with what values?
• which parameters are insufficiently documented?
• which aspects of a processor should be parameterizable but are not?

Notes on document-specific usage

E.g. which processors worked best with what material? -- feel free to post sample images here, too.