edgefinder.pde

import gab.opencv.*;

OpenCV opencv;
PImage src, canny;
int lowThreshold = 20;
int highThreshold = 75;

void setup() {
  src = loadImage("test.jpg");
  size(1080, 720, P2D);
  
  doCanny();
}

void doCanny() {
  opencv = new OpenCV(this, src);
  opencv.findCannyEdges(lowThreshold, highThreshold);
  canny = opencv.getSnapshot();
}

void draw() {
  if (keyPressed) {
    if (key == 'w') {
      lowThreshold++;
    } else if (key == 's') {
      lowThreshold--;
    }
    
    if (key == 'i') {
      highThreshold++;
    } else if (key == 'k') {
      highThreshold--;
    }
    
    if (key == 'w' || key == 's' || key == 'i' || key == 'k') {
      lowThreshold = constrain(lowThreshold, 0, 255);
      highThreshold = constrain(highThreshold, 0, 255);
      doCanny();
      println(lowThreshold + " " + highThreshold);
    }
  }
  
  image(canny, 0, 0);
}