CONSTANT

VALUE

MEANING OF dwLEVEL

OCR_Image_NoRotate

0x0000

This constant prevents automatic page rotation and performs OCR on documents in their original state.

OCR_Image_Autorotate

0x0001

This constant rotates input images automatically in order to correct minor skews (up to 45 degrees) that can occur when documents are not correctly scanned.

OCR_Image_EdgeRefine

0x0002

This constant is a smart blur method that reduces letter edge artifacts and is useful for unsampled images. A DPI of at least 300 is recommended for this constant.

OCR_Image_GaussianBlur

0x0004

This constant is a simple blur method that reduces letter edge artifacts.

OCR_Content_Original

0x0040

This custom flag overlays recognized text over the original content.