L_INT LBitmap::BlankPageDetector(bIsBlank, pAccuracy, PMargins, uFlags)
Determines whether the scanned image is a blank page or not.
Address of the variable to be updated with image status indicating whether it is a blank page. Possible values are:
Address of the variable to be updated with the accuracy percentage of the result. Possible values range from 0 to 10000. This value is divided internally by the value 100.
Pointer to the PAGEMARGINS structure that contains information about excluded margins. Pass NULL as no margins to exclude.
Flags that indicate how to consider blank pages and the function behavior. You can combine values when appropriate by using a bitwise OR ( | ). Possible values are:
|BLANK_DETECT_EMPTY||[0x00000000] A page must be totally blank.|
|BLANK_DETECT_NOISY||[0x00000001] A page may have some noise. This is the default value.|
|BLANK_NOT_BLEED_THROUGH||[0x00000000] Don't ignore bleed through from the page.|
|BLANK_BLEED_THROUGH||[0x00000010] Ignore bleed through from the page. This is the default value.|
|BLANK_DONT_DETECT_LINES||[0x00000000] Don't consider lined page as a blank page. This is the default value.|
|BLANK_DETECT_LINES||[0x00000100] Consider lined page as a blank page.|
|BLANK_DONT_USE_ACTIVE_AREA||[0x00000000] Don't ignore blank spaces around the page edges. This is the default value.|
|BLANK_USE_ACTIVE_AREA||[0x00001000] Ignore blank spaces around the page edges.|
|BLANK_DEFAULT_MARGIN||[0x00000000] Use default margins, which are computed automatically by the function based on the page dimensions. This is the default value.|
|BLANK_USER_MARGIN||[0x00010000] Use the user-specified margins, which are specified in PMargins.|
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
Scanned image could contain few blank (empty) pages used as separators, or just empty pages. This function determines whether the scanned image is a blank page or not, and gives an accuracy percentage of the result. It detects noisy, bleed through, and lined blank pages with high precision and speed. This function helps in reducing disk storage of scanned images.
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("Image4.cmp")), 0,ORDER_BGR);
nRet = LeadBitmap.BlankPageDetector(&bIsBlank, &uAccuracy, NULL, BLANK_DETECT_NOISY|BLANK_BLEED_THROUGH|BLANK_DEFAULT_MARGIN);
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