L_Doc2DetectOrientationDegree

#include "ltdoc2.h"

L_LTDOC2_API L_INT EXT_FUNCTION L_Doc2DetectOrientationDegree(hDoc, nPageIndex, pnRotate)

Determines the angle by which the specified page needs to be oriented.

Parameters

L_HDOC2 hDoc

Handle to the OCR document.

L_INT nPageIndex

Index of the page for which to get the orientation angle. This index is zero-based.

L_INT * pnRotate

Pointer to a variable to be updated with the orientation angle, in degrees. Possible values are: +90, +180, and +270. The rotation is clockwise.

Returns

Comments

The purpose of orientation is to make the page more readable during recognition by making sure the top of the page is positioned properly. That is, a page that is oriented correctly like this:

is much more readable than the same page oriented like this:

✎ NOTE

This function just provides the angle of orientation that is needed. It does not actually orient the page. To automatically orient the page, call the L_Doc2AutoOrientPage / L_Doc2AutoOrientPageExt function.

If the specified page does not need to be oriented the pnRotate parameter is updated with 0.

Required DLLs and Libraries

• LTDOC2
• For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

L_INT Doc2DetectOrientationDegreeExample(L_HDOC2 hDoc,L_INT nPageIndex) 
{ 
   L_INT nRet; 
   L_INT nRotate = 0; 
 
   nRet = L_Doc2DetectOrientationDegree(hDoc, nPageIndex, &nRotate); 
   if (nRet == SUCCESS) 
   { 
      L_TCHAR szBuffer[1024]; 
      wsprintf(szBuffer, TEXT("Orientation degree = %d"), nRotate); 
      MessageBox(NULL, szBuffer, TEXT("Notice!"), MB_OK); 
   } 
   else 
      return nRet; 
   return SUCCESS; 
}