Detects whether the specified image (page) is inverted (white text and black background). Can invert it if it is not.
#include "l_bitmap.h"
L_LTIMGCOR_API L_INT EXT_FUNCTION L_InvertedPageBitmap(pBitmap, bIsInverted, uFlags)
Pointer to the bitmap handle that references the bitmap.
Address of a variable to be updated with the detection result. Possible values are:
Value | Meaning |
---|---|
TRUE | The image is inverted. |
FALSE | The image is not inverted. |
Flags that indicate whether to invert the image and how to do it. Possible values are:
Value | Meaning |
---|---|
INVERTEDPAGE_PROCESS | [0x00000000] Invert the image. |
INVERTEDPAGE_NOPROCESS | [0x00000001] Do not invert the image. Generally this flag is used to find whether the image is inverted. |
INVERTEDPAGE_EXCLUDE_BORDER | [0x00000002] Excludes White or Black borders from the calculations. |
INVERTEDPAGE_USE_ZONES | [0x00000004] An advanced version that is able to detect figure images before inverting them. This option is slower than the other options. This flag cannot be used with INVERTEDPAGE_EXCLUDE_BORDER. |
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
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.
If uFlags
contains INVERTEDPAGE_NOPROCESS, the function will update bIsInverted
with the result, without inverting the image.
To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.
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 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, Linux.
L_INT InvertedPageBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap; /* Bitmap handle to hold the loaded image. */
L_BOOL IsInverted; /* the boolean that will hold the value of (Is the page inverted or not) */
/* Load the bitmap, keeping the bits per pixel of the file */
nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("OCR1.TIF")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if (nRet != SUCCESS)
return nRet;
nRet = L_InvertedPageBitmap(&LeadBitmap, &IsInverted, INVERTEDPAGE_PROCESS);
if (nRet != SUCCESS)
return nRet;
nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
if (nRet != SUCCESS)
return nRet;
//free bitmap
if (LeadBitmap.Flags.Allocated)
L_FreeBitmap(&LeadBitmap);
return SUCCESS;
}
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