so i am writing some blob detection code for school, and it is not performing very well. I think the root of the problem is something is wrong with my "expand blob" algorithem.

I have posted some code. If you could look over it and offer me any suggestions i would be greatly appreciative. Thank you!

void expandBlob(IPoint initialPoint, Blob curBlob){
markBuffer(initialPoint);
//Expand the x
boolean isGood=true;
IPoint myPoint=new IPoint(0,0);
myPoint=initialPoint;
println("currently examining this point " + myPoint.x + ","+ myPoint.y);
//Blob myBlob;
//myBlob=curBlob;
while(isGood){
 myPoint.x+=1;
 
 if (isBlob(myPoint)){
   curBlob.size+=1;
   
   if (curBlob.upperRight.x<myPoint.x){
     curBlob.upperRight.x=myPoint.x;
   }
   if (curBlob.lowerRight.x<myPoint.x){
     curBlob.lowerRight.x=myPoint.x;
   }
   expandBlob(myPoint, curBlob);
 
 }
 
 else {isGood=false;}
 markBuffer(myPoint);
}

//expand the y
isGood=true;
myPoint=initialPoint;
while(isGood){
 myPoint.y+=1;
 if (isBlob(myPoint)){
   curBlob.size+=1;
   
   if (curBlob.upperRight.y<myPoint.y){
     curBlob.upperRight.y=myPoint.y;
   }
   if (curBlob.lowerRight.y<myPoint.y){
     curBlob.lowerRight.y=myPoint.y;
   }
   expandBlob(myPoint, curBlob);
 
 }
 
 else {isGood=false;}
 markBuffer(myPoint);
}

//Now we need to shrink x and y
 //shrink the y
isGood=true;
myPoint=initialPoint;
while(isGood){
 myPoint.y-=1;
 if (isBlob(myPoint)){
   curBlob.size+=1;
   
   if (curBlob.upperRight.y<myPoint.y){
     curBlob.upperRight.y=myPoint.y;
   }
   if (curBlob.lowerRight.y<myPoint.y){
     curBlob.lowerRight.y=myPoint.y;
   }
   expandBlob(myPoint, curBlob);
 
 }
   else {isGood=false;}
 markBuffer(myPoint);
}
   //shrink the x
isGood=true;
myPoint=initialPoint;
while(isGood){
 myPoint.x-=1;
 if (isBlob(myPoint)){
   curBlob.size+=1;
   
   if (curBlob.upperRight.x<myPoint.x){
     curBlob.upperRight.x=myPoint.x;
   }
   if (curBlob.lowerRight.x<myPoint.x){
     curBlob.lowerRight.x=myPoint.x;
   }
   expandBlob(myPoint, curBlob);
 
 }
 


 
 else {isGood=false;}
 markBuffer(myPoint);
}


if (curBlob.size > finalBlob.size){
  finalBlob=curBlob;
}
 

 
}