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 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	Description
SmoothCommand	Smooths the bumps and fills in the nicks of a 1-bit black and white image.
BorderRemoveCommand	Removes the black borders in a 1-bit black and white image.
LineRemoveCommand	Removes horizontal and vertical lines in a 1-bit black and white image.
DotRemoveCommand	Finds and removes dots and specks of various sizes.
HolePunchRemoveCommand	Finds and removes hole punches.
InvertedTextCommand	Finds and modifies areas of inverted text in a 1-bit black and white image.
InvertedPageCommand	Checks and auto-corrects an inverted image (1-bit or color).
HighQualityRotateCommand	Performs 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: