L_INT LBitmap::AutoBinarize(uFactor, uFlags)
Applies binary segmentation to a bitmap automatically. This function is useful for improving recognition results (OCR, Barcode, OMR, ICR). This feature is available in version 16 or higher.
Threshold Factor. The meaning of this factor depends on which type of thresholding is being used. For more information see the description of the uFlags parameter.
Flags that indicate the type of pre-processing to perform on the bitmap and the type of thresholding to use. You can use a bitwise OR ( | ) to specify one flag from each group.
|AUTO_BINARIZE_PRE_AUTO||[0x00000000] Perform automatic pre-processing. This is the default value.|
|AUTO_BINARIZE_NO_PRE||[0x00000001] Do not perform pre-processing.|
|AUTO_BINARIZE_PRE_BG_ELIMINATION||[0x00000002] Eliminate the background of the bitmap but keep the key features, such as text.|
|AUTO_BINARIZE_PRE_LEVELING||[0x00000004] Perform automatic color leveling.|
|AUTO_BINARIZE_THRESHOLD_AUTO||[0x00000000] Perform automatic thresholding. This is the default value.|
|AUTO_BINARIZE_THRESHOLD_USER||[0x00000010] Let the user choose the threshold value, to be passed in uFactor. Valid values range from 0 to 255.|
|AUTO_BINARIZE_THRESHOLD_PERCENTILE||[0x00000020] Perform percentile thresholding. In this case uFactor is the percentage of black pixels at which to perform thresholding, expressed in hundredths of a percent. For example, 500 means 5 percent. Valid values range from 0 to 10000|
|AUTO_BINARIZE_THRESHOLD_MEDIAN||[0x00000040] Perform median thresholding.|
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
This function is useful for improving recognition results (OCR, Barcode, OMR, ICR).
Pre-processing using background elimination
Pre-processing using color leveling
Perform automatic, percentile or median threshold
Manually specify a threshold value
To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.
This function does not support 12 and 16-bit grayscale and 48 and 64-bit color images. If the image is 12 and 16-bit grayscale and 48 and 64-bit color, the function will not return an error.
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.
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.
nRet = LeadBitmap.Load(MAKE_IMAGE_PATH(TEXT("cannon.jpg")), 0,ORDER_BGR);
nRet = LeadBitmap.AutoBinarize (0, AUTO_BINARIZE_PRE_AUTO | AUTO_BINARIZE_THRESHOLD_AUTO);
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