L_ContourFilterBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_ContourFilterBitmap(pBitmap, nThreshold, nDeltaDirection, nMaximumError, nOption)

pBITMAPHANDLE pBitmap;	/* pointer to a bitmap handle */
L_INT16 nThreshold;	/* threshold value */
L_INT16 nDeltaDirection;	/* maximum angle */
L_INT16 nMaximumError;	/* maximum error */
L_INT nOption;	/* flag that controls the resulting image */

Performs a contour segment filter on the source bitmap. This function is available in the Medical Toolkits.

Parameter	Description
pBitmap	Pointer to a bitmap handle that references the bitmap that will be affected.
nThreshold	Threshold of the gradient magnitude. Values below this will be considered as background, and will be set to 0. Values can be from 1 to 254. A lower threshold provides a better quality image. Default is 15.
nDeltaDirection	Maximum angle for the thinning algorithm. Values can be from 1 to 64. Default is 35.
nMaximumError	Maximum error for approximation algorithm. Values can be from 0 to 255. Default is 5. This parameter is only valid if nOption is CONTOUR_APPROX_COLOR.
nOption	Flag that controls the resulting image. This value tells the method what process to complete before returning. Possible values are:
	Value	Meaning
	CONTOUR_THIN	[0] return after the thinning algorithm
	CONTOUR_LINK_BLACKWHITE	[1] return after contour linking, using only black and white
	CONTOUR_LINK_GRAY	[2] return after contour linking, using 256 grayscale
	CONTOUR_LINK_COLOR	[3] return after contour linking, using colors
	CONTOUR_APPROX_COLOR	[4] return after line segment approximation, using colors

Returns

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

Comments

The bits per pixel of the affected bitmap will change according to the value of nOption.

If nOption is:	Bits per pixel will be:
CONTOUR_THIN	8 bits per pixel grayscale
CONTOUR_LINK_BLACKWHITE	1 bit per pixel
CONTOUR_LINK_GRAY	8 bits per pixel grayscale
CONTOUR_LINK_COLOR	8 bits per pixel color
CONTOUR_APPROX_COLOR	8 bits per pixel color

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Supportfor 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.

Platforms

Windows 95 / 98 / Me, Windows 2000 / XP.

Functions:	L_DlgColorRes, L_DlgOpen, L_DlgSave
	L_DlgContourFilter, L_DlgResize
	L_DlgGammaAdjustment, L_DlgAddNoise, L_DlgEmboss, L_BricksTextureBitmap, L_DeskewBitmap, L_DeskewBitmapExt, L_DiffuseGlowBitmap, L_GlowFilterBitmap, L_HalfTonePatternBitmap, L_HighPassFilterBitmap, L_MaskConvolutionBitmap, L_PerspectiveBitmap, L_PlasmaFilterBitmap, L_PointillistBitmap