Member

Description

uStructSize

Structure size. It should be equal to sizeof(DOC2PREPROCESSINGOPTIONS).

BinarizationMode

This member will influence how a non-B/W image, which is stored in the engine, will be converted to a B/W image. For a list of possible values, refer to DOC2_CONVERSIONMODE.

InvertMode

This member specifies which image inversion mode will be used during the forthcoming image processing processes. The image inversion mode can be either automatic, switched on, or switched off (white-on-black to black-on-white). For a list of possible values, refer to DOC2_INVERTMODE.

RotationMode

This member specifies which image rotation mode will be used during a forthcoming image processing process. The image rotation mode can be automatic, switched off, or programmable. For a list of possible values, refer to DOC2_ROTATEMODE.

EnableDespeckleMode

This member specifies the engine’s image despeckle mode, i.e. whether the adaptive noise removal algorithm is to be activated implicitly when the current image is a B/W image. The noise removal algorithm runs only on B/W images with a resolution of 280 DPI or higher. This setting might influence the recognition accuracy. Possible values are:

Value

Meaning

TRUE

Activate the adaptive noise removal algorithm.

FALSE

Deactivate the adaptive noise removal algorithm.

nBrightness

This member fine tunes the threshold calculation in the automatic adaptive image conversion mode when the BinarizationMode member  is set to DOC2_CONVERSION_AUTO. This will influence the brightness/darkness of the resulting B/W image during the forthcoming image processing process. Valid values are range between 0 to 100.

nThreshold

This member specifies the threshold parameter of an image conversion to a B/W image. The parameter has an effect only when the BinarizationMode member  is set to DOC2_CONVERSION_SET. This setting is used during a forthcoming image processing process.