to scan a image verically in oder to create its vertical histogram

[cindrella cradford]

hello frnds,
i have a image whose vertical histogram i hv to obtain in oder to do some other functioning but pixelgrabber scans the image horizontally by taking scan line width as an argument........i.e it scans the all the columns of first row of image and then it jumps to next row.......what i want is it should scan first all rows of first column and then all rows of second column and so on.
i am giving my code of horizontal histogram (which is working correctly)
and my code of vertical histogram.....
please help me in doing the task
"FOR CALCULATING HORIZONTAL HISTOGRAM"
w= width;
h = height;
linepixels = new int [w*h] ;
linepix = new int [h][w] ;
hHisto = new int[h] ;
PixelGrabber pg = new PixelGrabber (img,0,0,w,h,linepixels,0,w);
try
{ pg.grabPixels();
}
catch(InterruptedException ee){ }

for (int t = 0 ;t <h ; t++)
hHisto[t] = 0;
try{
for( int i=0;i<w*h;i++)
{ int p= linepixels[i] ;
int r = 0xff & (p>>16) ;
int g = 0xff & (p>>8);
int b = 0xff & (p);

if(r>=127 && g>=127&& b>=127)
linepixels[i]=1;
else
linepixels[i]=0;

}
}
catch(ArrayIndexOutOfBoundsException out){}
int j= 0;
try{
for(int m=0; m<h;m++)
{ for(int n=0;n<w;n++)
{
linepix[m][n] = linepixels[j] ;
if (linepix[m][n]==0)
{

hHisto[m]=hHisto[m] + 1 ;

}

j++ ;
}


}

}
catch(ArrayIndexOutOfBoundsException out){}



"FOR CACULATING VERTICAL HISTOGRAM"

wordpixels = new int [hh*w] ;
wordpix = new int [w][hh] ;
subvHisto = new int[w] ;
PixelGrabber pg = new PixelGrabber (img,0,harr[jj],w,hh,wordpixels,0,w);
jj=jj+2;
try
{ pg.grabPixels();
}
catch(InterruptedException ee){ }

for (int t = 0 ;t <w ; t++)
subvHisto[t] = 0;
try{
for( int i=0;i<w*hh;i++)
{ int p= wordpixels[i] ;
int r = 0xff & (p>>16) ;
int g = 0xff & (p>>8);
int b = 0xff & (p);

if(r>=127 && g>=127&& b>=127)
wordpixels[i]=1;
else
wordpixels[i]=0;

}
}
catch(ArrayIndexOutOfBoundsException out){}
int j= 0;
try{
for(int m=0; m<w;m++)
{ for(int n=0;n<hh;n++)
{
wordpix[m][n] =wordpixels[j] ;
if (wordpix[m][n]==0)
{

subvHisto[m]=subvHisto[m] + 1 ;

}

j++ ;
}


}

}
catch(ArrayIndexOutOfBoundsException out){}