LBitmap::AdaptiveContrast

#include "ltwrappr.h"

virtual L_INT LBitmap::AdaptiveContrast (uDim, uAmount, uFlag)

L_UINT uDim;	/* dimensions of the neighborhood (uDim x uDim), in pixels */
L_UINT uAmount;	/* adjustment factor */
L_UINT uFlag;	/* flag */

Performs adaptive contrast enhancement (ACE) to regions that are originally low in contrast. This function is available in the Medical and above toolkits.

Parameter	Description
uDim	Dimensions of the neighborhood used for filtering (uDim x uDim), in pixels.
uAmount	Value that represents an adjustment factor. Its range starts from 100 and has no upper limit.
uFlag	Value that indicates the adjustment method. Possible values are:
	Value	Meaning
	ACE_EXP	[0x0001] Apply exponential adjustment.
	ACE_LIN	[0x0002] Apply linear adjustment.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

Adaptive contrast enhancement (ACE) adjusts bitmap contrast by giving more contrast to areas which are originally low in contrast. This is different from histogram-based techniques which are based on all bitmap pixels (the histogram itself).

Local histogram equalization is another technique that can be used to reveal detail of areas, since it depends on area pixels only. Use LBitmap::LocalHistoEqualize to perform a local histogram equalization.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

Required DLLs and Libraries

LTIMG

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Functions:	LBitmap::AdjustTint, LBitmap::GammaCorrectExt, LBitmap::HistoEqualize, LBitmap::ChangeContrast, LBitmap::ChangeIntensity, LBitmap::GammaCorrect, LBitmap::HistoContrast, LBitmap::StretchIntensity, LBitmap::Invert, LBitmap::ChangeHue, LBitmap::ChangeSaturation, LBitmapBase::Fill, LBitmapBase::GetPixelColor, LBitmapBase::PutPixelColor, LBitmap::GetHistogram, LBitmap::WindowLevel, LBitmap::LocalHistoEqualize, LBitmap::ChangeHueSatIntBitmap
Topics:	Raster Image Functions: Modifying Intensity Values
	Changing Brightness and Contrast
	Raster Image Functions: Changing Brightness and Contrast