Angle correction of each line in an article

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I want to correct each line in an article. if you have any idea please help me. i have used hough transformation to detect lines. but it doesn't work for all articles. so if you have any idea please help me...

#include "stdafx.h"
#include<opencv\cv.h>
#include<opencv\cxcore.h>
#include<opencv\highgui.h>
#include <math.h>
#include <stdlib.h>

int main(int argc, char** argv)
{
    IplImage* src = cvLoadImage("110.jpg");     
    IplImage* dst;
    IplImage* color_dst;
    IplImage* tempx = cvCreateImage(cvGetSize(src),IPL_DEPTH_16S,1);

    CvMemStorage* storage = cvCreateMemStorage(0);
    CvSeq* lines = 0;
    int i;

    if( !src )
        return -1;

    dst = cvCreateImage( cvGetSize(src), 8, 1 );
    color_dst = cvCreateImage( cvGetSize(src), 8, 3 );  
    cvCanny( src, dst, 50, 200, 3 );

    cvCvtColor( dst, color_dst, CV_GRAY2BGR );
    CvSize size = cvGetSize(dst);

    lines = cvHoughLines2( dst, storage, CV_HOUGH_PROBABILISTIC, 1, CV_PI/45, 50, 50, 10 );

    for( i = 0; i < lines->total; i++ )
    {
        CvPoint* line = (CvPoint*)cvGetSeqElem(lines,i);
        cvLine( color_dst, line[0], line[1], /*CV_RGB(255,0,0)*/cvScalar(255, 0 ,0), 4, CV_AA, 0 );
    }

    cvNamedWindow( "Source", 1 );
    cvShowImage( "Source", dst );
    cvNamedWindow( "Hough", 1 );
    cvShowImage( "Hough", color_dst );
    cvWaitKey(0);
    return 0;
}