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import gab.opencv.*;
PImage img;
OpenCV opencv;
Histogram histogram;
int lowerb = 50;
int upperb = 100;
void setup() {
img = loadImage("colored_balls.jpg");
opencv = new OpenCV(this, img);
size(opencv.width, opencv.height);
opencv.useColor(HSB);
}
void draw() {
opencv.loadImage(img);
image(img, 0, 0);
opencv.setGray(opencv.getH().clone());
opencv.inRange(lowerb, upperb);
histogram = opencv.findHistogram(opencv.getH(), 255);
image(opencv.getOutput(), 3*width/4, 3*height/4, width/4,height/4);
noStroke(); fill(0);
histogram.draw(10, height - 230, 400, 200);
noFill(); stroke(0);
line(10, height-30, 410, height-30);
text("Hue", 10, height - (textAscent() + textDescent()));
float lb = map(lowerb, 0, 255, 0, 400);
float ub = map(upperb, 0, 255, 0, 400);
stroke(255, 0, 0); fill(255, 0, 0);
strokeWeight(2);
line(lb + 10, height-30, ub +10, height-30);
ellipse(lb+10, height-30, 3, 3 );
text(lowerb, lb-10, height-15);
ellipse(ub+10, height-30, 3, 3 );
text(upperb, ub+10, height-15);
}
void mouseMoved() {
if (keyPressed) {
upperb += mouseX - pmouseX;
}
else {
if (upperb < 255 || (mouseX - pmouseX) < 0) {
lowerb += mouseX - pmouseX;
}
if (lowerb > 0 || (mouseX - pmouseX) > 0) {
upperb += mouseX - pmouseX;
}
}
upperb = constrain(upperb, lowerb, 255);
lowerb = constrain(lowerb, 0, upperb-1);
}