core point of fonger print detection

ok i m uploding my part of code it debug prfectly no error but output is not corect means it dose not locate rit location of core point.


for(int x = 0; x+pBl_Sz <=(&pioncare)->height ; x=x+pBl_Sz)
{
for(int y = 0; y+pBl_Sz <=(&pioncare)->width; y=y+pBl_Sz)
{
//fprintf(fb,"\n\nFor Block %d\n\n",++count);
cvSetImageROI(&pioncare,cvRect(y,x,pBl_Sz,pBl_Sz));
cv::Mat L(&pioncare);

for(int j=1; j<l.rows-1;j>(j,i-1))-(L.at<float>(j-1,i-1)));
{
if (abs(s0)<90)
d0=s0;
else if (s0<-90)
d0=s0+180;
else if (s0>90)
d0=180-s0;
}
float s1 = ((L.at<float>(j+1,i-1))-(L.at<float>(j,i-1)));
{
if (abs(s1)<90)
d1=s1;
else if (s1<-90)
d1=s1+180;
else if (s1>90)
d1=180-s1;
}
float s2 = ((L.at<float>(j+1,i))-(L.at<float>(j+1,i-1)));
{
if (abs(s2)<90)
d2=s2;
else if (s2<-90)
d2=s2+180;
else if (s2>90)
d2=180-s2;
}
float s3 = ((L.at<float>(j+1,i+1))-((L.at<float>(j+1,i))));
{
if (abs(s3)<90)
d3=s3;
else if (s3<-90)
d3=s3+180;
else if (s3>90)
d3=180-s3;
}
float s4 = ((L.at<float>(j,i+1))-(L.at<float>(j+1,i+1)));
{
if (abs(s4)<90)
d4=s4;
else if (s4<-90)
d4=s4+180;
else if (s4>90)
d4=180-s4;
}
float s5 = ((L.at<float>(j-1,i+1))-(L.at<float>(j,i+1)));
{
if (abs(s5)<90)
d5=s5;
else if (s5<-90)
d5=s5+180;
else if (s5>90)
d5=180-s5;
}
float s6 = ((L.at<float>(j-1,i))-((L.at<float>(j-1,i+1))));
{
if (abs(s6)<90)
d6=s6;
else if (s6<-90)
d6=s6+180;
else if (s6>90)
d6=180-s6;
}
float s7 = ((L.at<float>(j-1,i-1))-((L.at<float>(j-1,i))));
{
if (abs(s7)<90)
d7=s7;
else if (s7<-90)
d7=s7+180;
else if (s7>90)
d7=180-s7;
}
p=((d0+d1+d2+d3+d4+d5+d6+d7)/360);

}
}

if (p<0.45||p>0.51)
{
}
else
{
s.val[0]= 255;
cvSet2D(coreImage,(x+1),(y+1),s);
fprintf(fb,"\n %d %d \n",x+1,y+1);

}
cvResetImageROI(&pioncare);
}
fprintf(fb,"\n");
}

but why will u plz tel my error???
and which details....
plz help me sir its my MS Thesis project.... :-(