i have an assignment and i'm almost done but i just need a little bit of help to finish it.
any help would be much appreciated.

here's the assignment requirements:
http://people.scs.carleton.ca/~lanthier/teaching/COMP1405/Assignments/COMP1405_A5_F11.pdf

and here's my code so far:





PImage originalFingerprint;
PImage updatedFingerprint;
int imageWidth;      //image width
int imageHeight;     //image height
int imgCount = 0;
 
byte[][] imageArray; // The binary fingerprint image as an array
byte[][] maskArray;  // The binary mask as an array

void thinning(){
 
  for (int col=1; col<originalFingerprint.width-1; col++) {
    for (int row=1; row<originalFingerprint.height-1; row++) {
      maskArray[col][row] = 0;
      //Check if its black or white
      if (brightness(originalFingerprint.get(col, row)) < 127)
        //if black then
        imageArray[col][row] = 1;
      else
        //if white then...
        imageArray[col][row] = 0;
     
      //If the pixel in the array is black then...
      if (imageArray[col][row] == 1) {     
        //1st pass
        //If the pixel above is white, and the pixel below is black then...
        if(imageArray[col][row-1] == 0 && imageArray[col][row+1] == 1){
          //Check connectivity         
          if (((1-imageArray[col+1][row]) - ((1-imageArray[col+1][row])*(1-imageArray[col+1][row-1])*(1-imageArray[col][row-1])) +
             (1-imageArray[col][row-1]) - ((1-imageArray[col][row-1])*(1-imageArray[col-1][row-1])*(1-imageArray[col-1][row])) +
             (1-imageArray[col-1][row]) - ((1-imageArray[col-1][row])*(1-imageArray[col+1][row+1])*(1-imageArray[col][row+1])) +
             (1-imageArray[col][row+1]) - ((1-imageArray[col][row+1])*(1-imageArray[col+1][row+1])*(1-imageArray[col+1][row]))) == 1) {
             maskArray[col][row] = 1;
             imageArray[col][row] = 0;
          }   
        }
        //2nd pass
        //if pixel left is white and right is black
        if(imageArray[col-1][row] == 0 && imageArray[col+1][row] == 1){
          //Check connectivity  
          if (((1-imageArray[col+1][row]) - ((1-imageArray[col+1][row])*(1-imageArray[col+1][row-1])*(1-imageArray[col][row-1])) +
             (1-imageArray[col][row-1]) - ((1-imageArray[col][row-1])*(1-imageArray[col-1][row-1])*(1-imageArray[col-1][row])) +
             (1-imageArray[col-1][row]) - ((1-imageArray[col-1][row])*(1-imageArray[col+1][row+1])*(1-imageArray[col][row+1])) +
             (1-imageArray[col][row+1]) - ((1-imageArray[col][row+1])*(1-imageArray[col+1][row+1])*(1-imageArray[col+1][row]))) == 1) {
             maskArray[col][row] = 1;
             imageArray[col][row] = 0; 
          }
        }
        //3rd pass
        //if pixel above is black and pixel below is white
        if(imageArray[col][row-1] == 1 && imageArray[col][row+1] == 0){
          //Check connectivity  
          if (((1-imageArray[col+1][row]) - ((1-imageArray[col+1][row])*(1-imageArray[col+1][row-1])*(1-imageArray[col][row-1])) +
             (1-imageArray[col][row-1]) - ((1-imageArray[col][row-1])*(1-imageArray[col-1][row-1])*(1-imageArray[col-1][row])) +
             (1-imageArray[col-1][row]) - ((1-imageArray[col-1][row])*(1-imageArray[col+1][row+1])*(1-imageArray[col][row+1])) +
             (1-imageArray[col][row+1]) - ((1-imageArray[col][row+1])*(1-imageArray[col+1][row+1])*(1-imageArray[col+1][row]))) == 1) {
             maskArray[col][row] = 1; 
             imageArray[col][row] = 0;
          }
        }
        //4th pass
        //if pixel left is black and right is white
        if(imageArray[col-1][row] == 1 && imageArray[col+1][row] == 0){
          //Check connectivity  
          if (((1-imageArray[col+1][row]) - ((1-imageArray[col+1][row])*(1-imageArray[col+1][row-1])*(1-imageArray[col][row-1])) +
             (1-imageArray[col][row-1]) - ((1-imageArray[col][row-1])*(1-imageArray[col-1][row-1])*(1-imageArray[col-1][row])) +
             (1-imageArray[col-1][row]) - ((1-imageArray[col-1][row])*(1-imageArray[col+1][row+1])*(1-imageArray[col][row+1])) +
             (1-imageArray[col][row+1]) - ((1-imageArray[col][row+1])*(1-imageArray[col+1][row+1])*(1-imageArray[col+1][row]))) == 1) {
             maskArray[col][row] = 1; 
             imageArray[col][row] = 0;
          }
        }
      }
     // maskArray[col][row] = 0;
    }//end 2nd for loop
  }//end first for loop
}//end thinning()

void drawNew(){
  //Drawing the updated fingerprint 
  for (int col = 0; col < originalFingerprint.width; col++) {
      for (int row = 0; row < originalFingerprint.height; row++) {
        if (imageArray[col][row] == 1) updatedFingerprint.set(col, row, 0);
        else updatedFingerprint.set(col, row, #FFFFFF);
    }
  }
}

void mousePressed(){
  //Change picture each time mouse is clicked
  imgCount++;
  if(imgCount == 0) {
    originalFingerprint = loadImage("print1.png");
  }
  if(imgCount == 1) {
    originalFingerprint = loadImage("print1b.png");
  }
  if(imgCount == 2) {
    originalFingerprint = loadImage("print2.png");
  }
  if(imgCount == 3) {
    originalFingerprint = loadImage("print2b.png");
  }
  if(imgCount == 4) {
    originalFingerprint = loadImage("print3.png");
  }
  if(imgCount == 5) {
    originalFingerprint = loadImage("print3b.png");
    imgCount = -1;//reset counter
  }
 
}
void setup() {
  //Use image dimensions for window dimensions
  originalFingerprint = loadImage("print1.png"); //load the image from the file
  imageWidth = originalFingerprint.width; //get pixel width of image
  imageHeight = originalFingerprint.height; //get pixel height of image
 
  updatedFingerprint = createImage(imageWidth,imageHeight, RGB);
  updatedFingerprint.loadPixels();

  imageArray = new byte[originalFingerprint.width][originalFingerprint.height];
  maskArray = new byte[originalFingerprint.width][originalFingerprint.height];
 
 
  size(imageWidth*2,imageHeight);  //set the size of canvas window                             
}

void draw(){
  image(originalFingerprint, 0, 0);
  image(updatedFingerprint, imageWidth, 0);
  thinning();   
  drawNew();       
}