Different results with same function and argument in c++ code - c++

Question

I've made a function that calculate chebyshev moment for an image, here is the main code. I have different results with same image, and every time I run I get new values. Here is the functions and the main code.
float calcul_ro(int p,int N)
{int i; float ro_p=1,float_N=(float)N;
if (p==0)
ro_p=(float)N;
else {
for (i=1;i<=p;i++)
ro_p=ro_p*(1-((i*i)/(N*N)));
ro_p=(ro_p*float_N)/(2*p+1);
}
return ro_p;
}
///______________________________________________________________________________///
float calcul_tp(int x,int p,int N,float tp_1,float tp_2)
{float tp, float_N=(float)N;
if (p==0)
tp=1;
else if(p==1)
tp=2*x+1-N;
else
{ //tp=((2*p-1)*tp_1)-((p-1)*(1-(pow((float)(p-1),2)/pow(float_N,2)))*tp_2);
tp=((2*p-1)*tp_1)-(((p-1)*(1-((p-1)*(p-1))/(N*N)))*tp_2);
tp=tp/p;}
return tp;
}
///______________________________________________________________________///
float *chebychev_moment(Mat image,int N)
{int p,q,x=0,y=0,i=0,j,compt=0,hml=0; float rslt,alpha_p,alpha_q,beta_p,beta_q,ro_p=1,ro_q=1,tp,tq;
float *vect=new float[55];
float tp_moins_1[100][100], tp_moins_2[100][100], tq_moins_1[100][100],tq_moins_2[100][100];
///******************************************************************
///initialisation de tp_moins_1
for(i=0;i<100;i++)
{
for(j=0;j<100;j++)
tp_moins_1[i][j]=1;
}
///************************************************************************
for (p=0;p<9;p++)
{
for(i=0;i<100;i++)
{
for(j=0;j<100;j++)
tq_moins_1[i][j]=1;
}
for(q=0;q<=9-p;q++)
{
ro_p=calcul_ro(p,N);
ro_q=calcul_ro(q,N);
///************************************
for (x=0;x<image.rows;x++)
{ y=0;
tp=calcul_tp(x,p,N, tp_moins_1[x][y], tp_moins_2[x][y]);
tp_moins_2[x][y]=tp_moins_1[x][y];
tp_moins_1[x][y]=tp;
for(y=0;y<image.cols;y++)
{ if(image.at<int>(x,y)!=0)
{tq=calcul_tp(y,q,N,tq_moins_1[x][y],tq_moins_2[x][y]);
tq_moins_2[x][y]=tq_moins_1[x][y];
tq_moins_1[x][y]=tq;
rslt=rslt+tp*tq*image.at<int>(x,y);}
}
}
///************************
rslt=rslt*(1/(ro_p*ro_q));
printf("rslt %d ,p=%d,q=%d, =%f \n",hml,p,q,rslt);
vect[compt]=rslt;
compt++;
rslt=0;
}}
return vect;
}
///______________________________________________________________________________///
int main()
{ Mat image=imread("2_.png",CV_LOAD_IMAGE_GRAYSCALE);
float *vect=new float[55], *vect2=new float[55];
vect=chebychev_moment(image,100);
Mat image2=imread("2_.png",CV_LOAD_IMAGE_GRAYSCALE);
vect2=chebychev_moment(image2,100);
//function that copy the vector in a file
write_on_file(vect,"vector_image3.txt");
write_on_file(vect2,"vector_image4.txt");
return 0;}
Can someone please help me?

Answer 1

Looks like rslt in chebychev_moment is used before it is set. Probably you forgot to initialise it to 0. alpha_p, alpha_q, beta_p, beta_q are not used at all.