L_SegmentBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_SegmentBitmap(pBitmap, uThreshold, uFlag)

pBITMAPHANDLE pBitmap;	/* pointer to bitmap */
L_UINT uThreshold;	/* threshold value */
L_UINT uFlags;	/* flag */

Divides the bitmap into segments where each segment’s pixels have approximately the same color (homogenous color). This function is available in the Raster Pro and above toolkits.

Parameter	Description
pBitmap	Pointer to the bitmap handle referencing the bitmap to be changed.
uThreshold	The tolerance value of each segment. Valid values for this parameter are: 0 to 255 for 1, 2, 3, 4, 5, 6, 7, 8, 24, and 32-bit bitmaps, 0 to 4095 for 12-bit bitmaps and 0 to 65535 for 16, 48, and 64-bit bitmaps.
uFlags	Flag that indicates the color space used in the segmentation. Possible values are:
	Value	Meaning
	SGM_RGB	[0x00001] Comparison done on red, green and blue difference.
	SGM_Y	[0x00002] Comparison done on Y channel difference of YUV space.
	SGM_U	[0x00003] Comparison done on U channel difference of YUV space.
	SGM_V	[0x00004] Comparison done on V channel difference of YUV space.
	SGM_UV	[0x00005] Comparison done on U and V channels difference of YUV space.
	SGM_NGTV_UV	[0x00010] Consider negative values of U and V of YUV color space. This flag is used only with the SGM_U or SGM_V flags.

Returns

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

Comments

This function divides the images into segments according to its pixel values. The segment shapes will be arbitrary. Adjacent pixels with approximately the same values are put together into homogenous segments. The function may be performed on the RGB and YUV color spaces.

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

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.

Platforms

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

See Also

Functions:	L_ChangeBitmapIntensity, L_GammaCorrectBitmap, L_ChangeBitmapContrast, L_HistoContrastBitmap, L_StretchBitmapIntensity, L_RemapBitmapIntensity, L_InvertBitmap, L_ChangeBitmapHue, L_ChangeBitmapSaturation, L_FillBitmap, L_GetPixelColor, L_PutPixelColor, L_GetBitmapHistogram, L_SharpenBitmap, L_MosaicBitmap, L_EmbossBitmap, L_AverageFilterBitmap, L_MedianFilterBitmap, L_AddBitmapNoise, L_IntensityDetectBitmap, L_SpatialFilterBitmap, L_BinaryFilterBitmap, L_MaxFilterBitmap, L_MinFilterBitmap, L_OilifyBitmap, L_SolarizeBitmap, L_WindowLevel, L_PosterizeBitmap, L_AddShadowBitmap, L_AllocFTArray, L_ChangeHueSatIntBitmap, L_ColorReplaceBitmap, L_ColorThresholdBitmap, L_DFTBitmap, L_DirectionEdgeStatisticalBitmap, L_FFTBitmap, L_FreeFTArray, L_FrqFilterBitmap, L_FrqFilterMaskBitmap, L_FTDisplayBitmap, L_GetBitmapStatisticsInfo, L_GetFeretsDiameter, L_GetObjectInfo, L_GetRgnContourPoints, L_GetRgnPerimeterLength, L_MathFunctionBitmap, L_RevEffectBitmap, L_SubtractBackgroundBitmap, L_UserFilterBitmap, L_HighPassFilterBitmap, L_BricksTextureBitmap, L_CanvasBitmap, L_CloudsBitmap, L_ColoredBallsBitmap, L_DiffuseGlowBitmap, L_DisplaceMapBitmap, L_FragmentBitmap, L_HalfTonePatternBitmap, L_MaskConvolutionBitmap, L_MosaicTilesBitmap, L_OffsetBitmap, L_PerspectiveBitmap, L_PlasmaFilterBitmap, L_PointillistBitmap, L_RomanMosaicBitmap, L_VignetteBitmap, L_ZigZagBitmap
Topics:	Raster Image Functions: Modifying Intensity Values
	Raster Image Functions: Artistic Effects
	Applying Artistic Effects

Example

/* This example loads a bitmap and segmentation function. */
BITMAPHANDLE LeadBitmap; /* Bitmap handle to hold the loaded image. */
/* Load the bitmap, keeping the bits per pixel of the file */
L_LoadBitmap (TEXT("IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
/* segment the bitmap */
L_SegmentBitmap (&LeadBitmap, 20, SGM_RGB);