This applet shows the processing.js implementation of the kmeans-colordisc tool presented previously.
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run : start distribution of cluster centers and draw disc diagram
next : load next image
less : remove one cluster
more : add a new cluster
And here is the code for it:
download sketch.pde
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PImage actp; PImage[] pictures; ArrayList allPix; ArrayList kmeans; int numpxs; int index=3; color bg; boolean run = false; void setup() { size(640, 360); colorMode(HSB, 255); bg = color(0, 255, 255); pictures = new PImage[4]; String path = "https://www.mathiasbernhard.ch/diary/wp-content/uploads/2012/pjs/"; pictures[0] = loadImage(path+"01.jpg"); pictures[1] = loadImage(path+"02.png"); pictures[2] = loadImage(path+"03.png"); pictures[3] = loadImage(path+"04.jpg"); actp = pictures[3]; allPix = new ArrayList(); next(); kmeans = new ArrayList(); for (int i=0; i<5; i++) { Zenter z = new Zenter(); kmeans.add(z); } } void draw() { if (run) { assignToZenters(); relocateZenters(); } background(0); if (actp!=null) image(actp, 0, 0); //disc pushMatrix(); translate(488, 180); noStroke(); float ac=0; float ad; if (kmeans!=null) { for (int j=0; j<kmeans.size(); j++) { Zenter z = kmeans.get(j); if (z!=null) { ad = (float)z.num/numpxs * TWO_PI; fill(z.x, z.y, z.z); arc(0, 0, 200, 200, ac, ac+ad); ac+=ad; } } } popMatrix(); } void loadPic(PImage p) { allPix.clear(); if (p==null) return; for (int i=0; i<p.pixels.length; i=i+4) { color c = p.pixels[i]; if (saturation(c)>5 && brightness(c)5) { Pixel f = new Pixel(c); allPix.add(f); } } numpxs = allPix.size(); } void assignToZenters() { if (kmeans==null) return; for (int j=0; j<kmeans.size(); j++) { Zenter z = kmeans.get(j); if (z!=null) z.members.clear(); } if (allPix==null) return; for (int i=0; i<allPix.size(); i++) { Pixel f = allPix.get(i); if (f!=null) f.assignToZenter(kmeans); Zenter z = f.getZ(); if (z!=null) z.members.add(f); } } void relocateZenters() { if (kmeans==null) return; for (int j=0; j<kmeans.size(); j++) { Zenter z = kmeans.get(j); if (z!=null) { z.relocate(); if (z.num<numpxs*0.01) { kmeans.remove(z); Zenter nz = new Zenter(); kmeans.add(z); } } } } void keyPressed() { switch (key) { case 'n': index = (index+1) % pictures.length; actp = pictures[index]; loadPic(actp); break; case 'm': Zenter z = new Zenter(); kmeans.add(z); break; case 'l': if (kmeans.size()>1) { int n = floor(random(kmeans.size())); kmeans.remove(n); } break; case 'r': run = !run; break; } } void go() { run = !run; } void next() { index = (index+1) % pictures.length; actp = pictures[index]; loadPic(actp); } void less() { if (kmeans.size()>1) { int n = floor(random(kmeans.size())); kmeans.remove(n); } } void more() { Zenter z = new Zenter(); kmeans.add(z); } void load(String path) { if (path == null) return; PImage p = loadImage(path); if (actp!=null) { loadPic(p); actp = p; } } class Pixel { float a, b, c; Zenter zen; Pixel(color cl) { this.a = hue(cl); this.b = saturation(cl); this.c = brightness(cl); this.zen = null; } Zenter getZ() { return this.zen; } void assignToZenter(ArrayList centers) { float mndst = 9999999; for (int j=0; j<centers.size(); j++) { Zenter z = centers.get(j); //wrap around hue float dh = min(abs(this.a-z.x), abs(255-max(this.a, z.x)+min(this.a, z.x))); float d = sq(dh)+sq(this.b-z.y)+sq(this.c-z.z); if (d<mndst) { mndst = d; this.zen = z; } } } } class Zenter { float x, y, z; ArrayList members; int num; Zenter() { this.x = random(55, 200); this.y = random(55, 200); this.z = random(55, 200); this.members = new ArrayList(); this.num = 0; } void relocate() { float suma = 0; float sumb = 0; float sumc = 0; int n = this.members.size(); for (int i=0; i<n; i++) { Pixel f = this.members.get(i); if (f.a<127) suma += f.a; else suma += f.a-255; sumb += f.b; sumc += f.c; } this.x = suma/n; if (this.x<0) this.x +=255; this.y = sumb/n; this.z = sumc/n; this.num = n; } } |
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