Detects and automatically deskews a 3D document image, with specifying the detection options.
#include "Ltimgcor.h"
L_LTIMGCOR_API L_INT L_PerspectiveDeskewExt(pBitmap, pOptions, uFlags)
Pointer to the bitmap handle referencing the bitmap to be deskewed.
Pointer to a structure specifying the options for the detection.
Reserved for future used. Pass 0.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
This function can change the specified image. To keep the original image unchanged, use this function on a copy.
For the best results, the document's boundaries should be inside the captured view and have a different background color than the background of the captured view.
Use the L_PerspectiveDeskewExt function if there is depth (z-axis) deformation as well as deformation along the x- and y- axes. Use the L_DeskewBitmap function to fix 2D orientation.
Unlike the L_DeskewBitmap function, the L_PerspectiveDeskewExt does not look at the content of the captured document.
If the L_PerspectiveDeskewExt fails to correct the skew, the original image is not changed.
To detect and deskew the 3D document image without specifying the detection options, call L_PerspectiveDeskew.
This function can only process entire images. It does not support regions.
This function supports 24 and 32-bit color images.
Win32, x64, Linux.
This example loads a bitmap and applies perspective deskew filter.
L_INT PerspectiveDeskewExtFilterBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap; /* Bitmap handle to hold the loaded image. */
/* Load the bitmap, keeping the bits per pixel of the file */
nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("PerspectiveDeskew.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if (nRet != SUCCESS)
return nRet;
/* Apply a perspective deskew filter*/
PERSPECTIVEDESKEWOPTIONS options = { 0 };
options.uStructSize = sizeof(PERSPECTIVEDESKEWOPTIONS);
options.bDonotProcessBitmap = FALSE;
nRet = L_PerspectiveDeskewExt(&LeadBitmap, &options, 0);
if (nRet != SUCCESS)
{
//free bitmap
if (LeadBitmap.Flags.Allocated)
L_FreeBitmap(&LeadBitmap);
return nRet;
}
nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
//free bitmap
if (LeadBitmap.Flags.Allocated)
L_FreeBitmap(&LeadBitmap);
return nRet;
}
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