virtual L_INT LBitmap::ContourFilter (nThreshold, nDeltaDirection, nMaximumError, nOption, uFlags = 0)
Performs a contour segment filter on the source bitmap.
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. |
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 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.
Win32, x64.
//ContourFilter
L_INT LBitmap__ContourFilterExample()
{
L_INT nRet;
LBitmap m_Bitmap;
nRet =m_Bitmap.Load(MAKE_IMAGE_PATH(TEXT("image1.cmp")), 0,ORDER_BGR);
if(nRet !=SUCCESS)
return nRet;
// Increase the Saturation
nRet =m_Bitmap.ContourFilter(5, 5, 5, CONTOUR_LINK_COLOR);
if(nRet !=SUCCESS)
return nRet;
return SUCCESS;
}
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