#include "l_bitmap.h"
L_LTIMGEFX_API L_INT L_ContourFilterBitmap(pBitmap, nThreshold, nDeltaDirection, nMaximumError, nOption, uFlags)
Performs a contour segment filter on the source bitmap.
Pointer to a bitmap handle that references the bitmap that will be affected.
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.
Maximum angle for the thinning algorithm. Values can be from 1 to 64. Default is 35.
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.
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 |
Reserved for future use. Must be 0.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
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. Support for 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
Win32, x64.
For an example, refer to L_DlgContourFilter.
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