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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title> pixelRestorer </title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, user-scalable=no">
<meta name="mobile-web-app-capable" content="yes">
<meta property="og:url" content="https://www.victorribeiro.com/pixelRestorer" />
<meta property="og:type" content="article" />
<meta property="og:title" content="Pixel Restorer" />
<meta property="og:author" content="Victor Ribeiro" />
<meta property="og:description" content="Using statistics to restore pixel art images." />
<meta property="og:image" content="https://www.victorribeiro.com/favicon.png" />
<link rel="icon" href="favicon.png" />
<style>
html, body{
height: 100%;
margin: 0;
padding: 0;
}
#canvas{
image-rendering: pixelated;
display: block;
z-index: 0;
max-width: 100%;
}
#buffer{
position: absolute;
top: 0;
left: 0;
z-index: 1;
max-width: 100%;
}
select, button{
display: block;
width: 100%;
padding: 0.3rem;
font-family: Arial, Helvetica, Sans;
font-size: 1rem;
}
#wrap{
height: 100%;
display: grid;
grid-template-rows: 1fr 1fr;
align-items: center;
justify-content: center;
}
</style>
</head>
<body>
<script>
let img, canvas, c, buffer, bc, probability, totalColors, size, pixelSize, btn, resize = true, render, _i, _j, method = 1;
let _sort = function(a,b){
return a - b;
}
let mode = function(array){
/* tem que tirar a moda da cor inteira e nao por canal. ex. [r,g,b] */
let mod = {};
for(let i = 0; i < array.length; i+=4){
let index = array[i]+","+array[i+1]+","+array[i+2];
if( mod[ index ] ){
mod[index] += 1;
}else{
mod[index] = 1;
}
}
let mode = [ array[ Math.floor(array.length/2) ],
array[ Math.floor(array.length/2)+1],
array[ Math.floor(array.length/2)+2 ] ], _max = 0;
for(let k in mod){
if( mod[k] > _max ){
_max = mod[k];
mode = k.split(",").map( _ => parseInt(_) );
}
}
return mode;
}
let median = function(array){
let index = Math.floor(array.length/2);
let median = [ array[index], array[index+1], array[index+2] ];
return median;
}
let mean = function(array){
let r = 0, g = 0, b = 0;
for(let i = 0; i < array.length; i+=4){
r += array[i];
g += array[i+1];
b += array[i+2];
}
let s = array.length / 4;
r = r / s;
g = g / s;
b = b / s;
return [r,g,b];
}
function init(src,action){
switch(action){
case '1' :
method = mean;
break;
case '2' :
method = mode;
break;
case '3' :
method = median
break;
default :
method = mean;
}
if(render){
cancelAnimationFrame( render );
render = null;
}
_i = 0, _j = 0;
btn = document.querySelector('#btn');
btn.innerText = "Run";
img = new Image();
img.src = src || 'img/mario.jpg';
img.onload = ()=>{
canvas = document.querySelector('#canvas');
canvas.width = img.width;
canvas.height = img.height;
buffer = document.querySelector('#buffer');
buffer.width = canvas.width;
buffer.height = canvas.height;
bc = buffer.getContext('2d');
c = canvas.getContext('2d',{alpha: false});
c.drawImage(img,0,0);
//getColors(10);
getPixelSize(100,10);
}
}
function getPixelSize(times, threshold){
times = times || 2;
threshold = threshold || 5;
probability = {};
for(let t = 2; t < times; t+=2){
if( img.width / t >= 3 ){
let prob = 0;
let sizeX = img.width / t ;
let sizeY = img.height / t ;
for(let i = 0, endI = img.height; i < endI; i+= sizeY){
for(let j = 0, endJ = img.width; j < endJ; j+= sizeX){
let patch = c.getImageData(j , i , sizeX, sizeY);
let pathMean = mean(patch.data);
rMean = pathMean[0];
gMean = pathMean[1];
bMean = pathMean[2];
if( (rMean > patch.data[patch.data.length/2]-threshold && rMean < patch.data[patch.data.length/2]+threshold) &&
(gMean > patch.data[patch.data.length/2+1]-threshold && gMean < patch.data[patch.data.length/2+1]+threshold) &&
(bMean > patch.data[patch.data.length/2+2]-threshold && bMean < patch.data[patch.data.length/2+2]+threshold) ){
prob += 1;
}
}
}
probability[t] = prob / (t*t);
}
}
}
/*
function correctColors(){
let m = 0, size;
for(key in probability){
if( probability[key] > m ){
m = probability[key];
size = key;
}
}
size = Math.floor(img.width / size);
console.log( size );
for(let i = 0; i < img.height; i+= size){
for(let j = 0; j < img.width; j+= size){
let data = c.getImageData(j,i,size,size);
let r = [], g = [], b = [];
for(let c = 0; c < data.data.length; c+=4){
r.push(data.data[c]);
g.push(data.data[c+1]);
b.push(data.data[c+2]);
}
r.sort(_sort);
g.sort(_sort);
b.sort(_sort);
r = r[r.length/2];
g = g[g.length/2];
b = b[b.length/2];
for(let c = 0; c < data.data.length; c+=4){
data.data[c] = r;
data.data[c+1] = g;
data.data[c+2] = b;
}
c.putImageData(data,j,i);
}
}
}
*/
function correctColorsRender(){
if( _i == 0 && _j == 0){
let m = 0, size;
for(key in probability){
if( probability[key] > m ){
m = probability[key];
size = key;
}
}
pixelSize = Math.floor(img.width / (Math.floor(size)+1));
if(resize){
let newW = size * pixelSize;
let newH = size * pixelSize;
canvas.width = newW;
canvas.height = newH;
c.drawImage(img,0,0,newW,newH);
}
let pos = canvas.getBoundingClientRect();
buffer.style.position = "absolute";
buffer.style.left = pos.left +"px";
buffer.style.top = pos.top + window.scrollY +"px";
buffer.width = canvas.width;
buffer.height = canvas.height;
buffer.style.width = pos.width+"px";
buffer.style.height = pos.height+"px";
}
let data = c.getImageData(_j,_i,pixelSize,pixelSize);
let rgb = method( data.data );
for(let c = 0; c < data.data.length; c+=4){
data.data[c] = rgb[0];
data.data[c+1] = rgb[1];
data.data[c+2] = rgb[2];
}
c.putImageData(data,_j,_i);
bc.clearRect(0,0,buffer.width,buffer.height);
bc.fillRect(_j,_i,pixelSize,pixelSize);
_j+=pixelSize;
if( _j >= img.width ){
_j = 0;
_i+=pixelSize;
}
if(_i < img.width){
render = requestAnimationFrame( correctColorsRender );
}
}
function correctColors(){
let m = 0, size;
for(key in probability){
if( probability[key] > m ){
m = probability[key];
size = key;
}
}
size = Math.floor(img.width / size);
for(let i = 0; i < img.height; i+= size){
for(let j = 0; j < img.width; j+= size){
let data = c.getImageData(j,i,size,size);
let r = [], g = [], b = [];
for(let c = 0; c < data.data.length; c+=4){
r.push(data.data[c]);
g.push(data.data[c+1]);
b.push(data.data[c+2]);
}
r.sort(_sort);
g.sort(_sort);
b.sort(_sort);
r = r[Math.floor(r.length/2)];
g = g[Math.floor(g.length/2)];
b = b[Math.floor(b.length/2)];
let minDist = Infinity, bestColor;
for(let d = 0; d < totalColors.length; d++){
let col = totalColors[d][0].split(",").map(v=>parseInt(v));
let dist = distance([r,g,b],col);
if( dist < minDist ){
minDist = dist;
bestColor = col;
}
}
for(let c = 0; c < data.data.length; c+=4){
data.data[c] = 0;
data.data[c+1] = 0;
data.data[c+2] = 0;
}
//c.fillRect(j,i,size,size);
c.putImageData(data,j,i);
}
}
}
function distance(a,b){
let sum = 0;
for(let s = 0; s < a.length; s++){
sum += Math.abs( parseInt(a[s]) - parseInt(b[s]) );
}
return sum;
}
function getColors(threshold){
threshold = threshold || 30;
let colors = {};
let data = c.getImageData(0,0,img.width,img.height);
for(let i = 0; i < data.data.length; i+=4){
if(colors[data.data[i]+","+data.data[i+1]+","+data.data[i+2]]){
colors[data.data[i]+","+data.data[i+1]+","+data.data[i+2]] += 1;
}else{
colors[data.data[i]+","+data.data[i+1]+","+data.data[i+2]] = 1;
}
}
let items = Object.keys(colors).map(function(key) {
return [key, colors[key]];
});
items.sort(function(first, second) {
return second[1] - first[1];
});
for(let i = 0; i < items.length-1; i++){
let valueA = items[i][0].split(",").map(v=>parseInt(v));
for(let j = items.length-1; j > i+1; j--){
if(items[j][1] < 10){
items.splice(j,1);
continue;
}
let valueB = items[j][0].split(",").map(v=>parseInt(v));
if( distance(valueA,valueB) < threshold ){
items[i][1] += items[j][1];
items.splice(j,1);
}
}
}
items.sort(function(first, second) {
return second[1] - first[1];
});
//totalColors = items.slice(0, 20);
totalColors = items;
}
function colorDistance(a,b){
let minColorA = a[0], minColorB = b[0], indexA = 0, indexB = 0;
for(let i = 1; i < a.length; i++){
if( minColorA < a[i] ){
minColorA = a[i];
indexA = i;
}
if( minColorB < b[i] ){
minColorB = b[i];
indexB = i;
}
}
let dist = 0;
for(let i = 0; i < a.length; i++){
dist += Math.abs( a[i] - b[i] );
}
if( indexA !== indexB ){
dist += 0.25 * minColorB;
}
return dist;
}
function change(){
let src = document.querySelector('#src').value;
let method = document.querySelector('#method').value;
init(src,method);
}
function toggleAnimation(){
if(!render){
correctColorsRender();
}else{
cancelAnimationFrame( render );
render = null;
}
}
window.onload = function(){
init();
document.body.addEventListener("keypress",function(e){
e.preventDefault();
if(e.keyCode == 13)
toggleAnimation();
});
btn.addEventListener("click", function(){
toggleAnimation();
btn.innerText = render ? "Pause" : "Run";
});
window.addEventListener("resize",function(){
init();
});
}
</script>
<div id="wrap">
<div id="screen">
<canvas id="canvas"></canvas>
<canvas id="buffer"></canvas>
</div>
<div id="tools">
<select id="src" onchange="change()">
<option value="img/mario.jpg"> Mario </option>
<option value="img/starrynight.jpg"> Starry Night </option>
<option value="img/lighthouse.jpg"> Lighthouse </option>
<option value="img/woody-allen.jpg"> Woody Allen </option>
</select>
<select id="method" onchange="change()">
<option value="1"> Mean </option>
<option value="2"> Mode </option>
<option value="3"> Median </option>
</select>
<button id="btn"> Run </button>
</div>
</div>
</body>
</html>