Cleaning Up 1-Bit Images

(Document/Medical) Scanned documents often contain a number of undesirable elements, including dots, blobs, lines, borders and hole punches. LEADTOOLS provides a number of classes that will improve the appearance of scanned documents by removing dots, blobs, lines, borders, hole punches, inverted page, inverted text, bumps and nicks. These classes are listed in the following table:

Leadtools.ImageProcessing.Core Class	WCF Support	WF Support	Description
SmoothCommand	Smooth	SmoothActivity	Smooths the bumps and fills in the nicks of a 1-bit black and white image.
BorderRemoveCommand	BorderRemove	BorderRemoveActivity	Removes the black borders in a 1-bit black and white image.
LineRemoveCommand	LineRemove	LineRemoveActivity	Removes horizontal and vertical lines in a 1-bit black and white image.
DotRemoveCommand	DotRemove	DotRemoveActivity	Finds and removes dots and specks of various sizes.
HolePunchRemoveCommand	HolePunchRemove	HolePunchRemoveActivity	Finds and removes hole punches.
InvertedTextCommand	InvertedText	InvertedTextActivity	Finds and modifies areas of inverted text in a 1-bit black and white image.
InvertedPageCommand	InvertedPage	InvertedPageActivity	Checks and auto-correct an inverted image (1-bit or color).
HighQualityRotateCommand	HighQualityRotate	HighQualityRotateActivity	Perform high quality rotation on a 1-bit black and white image.

Each of these classes utilizes flags that allow you to obtain a LEAD region (Leadtools.ImageProcessing.Core only) or a Windows region (all three) that contains all the elements removed from a document. In addition, event handlers allow you to provide customized region processing, as well as create your own composite of the removed regions.

Images can be straightened by using the following commands:

Leadtools.ImageProcessing.Core Class	WCF Support	WF Support	Description
			Deskewing.

For information about pre-processing color images, see Pre-processing Images for OCR.