Oh, in case its any help, here is the troublesome patch:


import processing.video.*;
import oscP5.*;
import netP5.*;

OscP5 oscP5;
NetAddress myRemoteLocation;



Capture video;

int numPixels;                      // number of pixels in the video
int rectDivide = 4;                 // the stage width/height divided by this number is the video width/height
int vidW;                           // video width
int vidH;                           // video height
int[][] colouredPixels;             // the different colour references for each pixel
int[][] colourCompareData;          // captured r, g and b colours
int currR;                          //
int currG;                          //
int currB;                          //
int[][] squareCoords;               // x, y, w + h of the coloured areas
color[] colours;                    // captured colours
int colourRange = 25;               // colour threshold
int[][] centrePoints;               // centres of the coloured squares
color[] pixelColours;
boolean isShowPixels = false;       // determines whether the square and coloured pixels are displayed
int colourMax = 2;                  // max amount of colours - also adjust the amount of colours added to pixelColours in setup()
int coloursAssigned = 0;            // amount of cours currently assigned
CoordsCalc coordsCalc;

void setup()
{
 size(640, 480);
 vidW = width / rectDivide;
 vidH = height / rectDivide;
 video = new Capture(this, vidW, vidH, 30);
 noStroke();
 numPixels = vidW * vidH;
 colouredPixels = new int[vidH][vidW];
 colourCompareData = new int[colourMax][3];
 squareCoords = new int[colourMax][4];
 colours = new color[colourMax];
 centrePoints = new int[colourMax][2];
 color c1 = color(0, 255, 0);
 color c2 = color(255, 0, 0);
 pixelColours = new color[colourMax];
 pixelColours[0] = color(0, 255, 0);
 pixelColours[1] = color(255, 0, 0);
 coordsCalc = new CoordsCalc();
 
 oscP5 = new OscP5(this, 12000);
 myRemoteLocation = new NetAddress("127.0.0.1", 12000);
}

void captureEvent(Capture video)
{
 video.read();
}

void draw()
{
 noStroke();
 fill(255, 255, 255);
 rect(0, 0, width, height);
 drawVideo();
 coordsCalc.update();
 for (int i = 0; i < coloursAssigned; i++)
 {
   if (isShowPixels) drawSquare(i);
 }
}


void drawVideo()
{
 for (int i = 0; i < coloursAssigned; i++)
 {
   fill(colours[i]);
   rect(i * 10, vidH, 10, 10);
 }
 image(video, 0, 0);
 noFill();
 stroke(255, 0, 0);
 strokeWeight(2);
 rect(vidW - 4, vidH - 4, 4, 4);
}

void drawSquare(int i)
{
 int sqX = squareCoords[i][0];
 int sqY = squareCoords[i][1];
 int sqW = squareCoords[i][2];
 int sqH = squareCoords[i][3];
 noFill();
 stroke(0, 0, 255);
 strokeWeight(3);
 rect(sqX, sqY, sqW, sqH);

 //stroke(0, 0, 255);
 //strokeWeight(4);
 rect(sqX * rectDivide, sqY * rectDivide, sqW * rectDivide, sqH * rectDivide);
 line(sqX * rectDivide, sqY * rectDivide, ((sqX * rectDivide) + (sqW * rectDivide)), ((sqY * rectDivide) + (sqH * rectDivide)));
 line(((sqX * rectDivide) + (sqW * rectDivide)), sqY * rectDivide, sqX * rectDivide, (sqY * rectDivide + sqH * rectDivide));
}

void keyPressed()
{
 println("key pressed = " + key);
 color currPixColor = video.pixels[numPixels - (vidW * 2) - 3];
 int pixR = (currPixColor >> 16) & 0xFF;
 int pixG = (currPixColor >> 8) & 0xFF;
 int pixB = currPixColor & 0xFF;
 if (key == 'p')
 {
   isShowPixels = !isShowPixels;
 }
 if (key == '1')
 {
   coloursAssigned = 1;
   colourCompareData[0][0] = pixR;
   colourCompareData[0][1] = pixG;
   colourCompareData[0][2] = pixB;
   colours[0] = color(pixR, pixG, pixB);
 }
 if (colourMax < 2 || coloursAssigned < 1) return;
 if (key == '2')
 {
   coloursAssigned = 2;
   colourCompareData[1][0] = pixR;
   colourCompareData[1][1] = pixG;
   colourCompareData[1][2] = pixB;
   colours[1] = color(pixR, pixG, pixB);
 }
 if (key == '0')
 {
   coloursAssigned = 0;
 }
}