LBitmap::LineRemove

#include "ltwrappr.h"

virtual L_INT LBitmap::LineRemove(pLineRemove)

/* pointer to a structure */

Removes horizontal and vertical lines in a 1-bit black and white image. This function is available in the Document/Medical Toolkits.

Parameter	Description
pLineRemove	Pointer to the LINEREMOVE structure that LEADTOOLS uses to perform the line removal operation

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function removes horizontal and vertical lines from scanned text documents. If the lines pass through text, the pLineRemove parameter can be configured to remove or preserve the text.

This function works only on 1-bit black and white images.

If a region is selected, only the selected region will be changed by this function. If no region is selected, the whole image will be processed.

The behavior of this function can be further modified by overriding LBitmap::LineRemoveCallback.

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.

Required DLLs and Libraries

LTIMG

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	LBitmap::LineRemoveCallback, LBitmap::Smooth, LBitmap::BorderRemove, LBitmap::InvertedText, LBitmap::DotRemove, LBitmap::HolePunchRemove
Topics:	Cleaning Up 1-Bit Images

Example

//This example removes vertical lines that are at least 200 pixels in length
// and no more than 5 pixels in width
//The lines can have gaps up to two pixels in length.
//The derived class LMyBitmap is used to override the LineRemoveCallBack function.
//myBitmap is an object of class LMyBitmap.
//The callback member function is used to display information about each line removed.
//The callback member function does NOT receive a Windows region.

void CCleanv12Dlg::OnButtonLines()
{
   LINEREMOVE        lr;

   lr.uStructSize    = sizeof(LINEREMOVE);
   lr.uBitmapStructSize        = sizeof(BITMAPHANDLE);
   lr.iGapLength     = 2;
   lr.iMaxLineWidth  = 5;
   lr.iMinLineLength = 200;
   lr.iWall          = 7;
   lr.iMaxWallPercent   = 10;
   lr.uRemoveFlags   = LINEREMOVE_HORIZONTAL;
   lr.uFlags         = LINE_USE_GAP;

   m_Bitmap.LineRemove(&lr);
   Invalidate();
}

L_INT LMyBitmap::LineRemoveCallBack(
                                    HRGN           hRgn,
                                    L_INT32        iStartRow,
                                    L_INT32        iStartCol,
                                    L_INT32        iLength
                                    )
{
   CString strMsg;

   strMsg.Format(
      TEXT("RowCol[%d,%d] Length[%d]\n"),
      iStartRow,
      iStartCol,
      iLength
      );
   OutputDebugString(strMsg);
   return SUCCESS_REMOVE;
}