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LEADTOOLS Raster Imaging C DLL Help

L_ContourFilterBitmap

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#include "l_bitmap.h"

L_LTIMGEFX_API L_INT L_ContourFilterBitmap(pBitmap, nThreshold, nDeltaDirection, nMaximumError, nOption, uFlags)

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 */

L_UINT32 uFlags;

/* flags */

Performs a contour segment filter on the source bitmap.

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

uFlags

Reserved for future use. Must be 0.

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 in the Document and Medical Imaging toolkits.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTIMGEFX

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

Win32, x64.

See Also

Functions:

L_DlgColorRes, L_DlgOpen, L_DlgSave

 

L_DlgContourFilter, L_DlgResize

 

L_DlgGammaAdjustment, L_DlgAddNoise, L_DlgEmboss, L_BricksTextureBitmap, L_DeskewBitmap, L_DiffuseGlowBitmap, L_GlowFilterBitmap, L_HalfTonePatternBitmap, L_HighPassFilterBitmap, L_MaskConvolutionBitmap, L_PerspectiveBitmap, L_PlasmaFilterBitmap, L_PointillistBitmap

Example

For an example, refer to L_DlgContourFilter.

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