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index.html
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<head>
<meta charset="UTF-8">
<style>
:root{
filter:invert(16%);
}
body{
background: rgb(0,0,0);
color:rgb(250,250,250);
font-family: sans-serif;
}
#content{
/*background: rgb(0,0,0);*/
position: absolute;
left:calc(50% - 400px);
width:800px;
}
h1{
font-weight: normal;
text-align:center;
}
h2{
font-weight: normal;
font-style: italic;
font-size:18px;
text-align:center;
}
pre {
font-size:15px;
white-space: pre-wrap; /* Since CSS 2.1 */
white-space: -moz-pre-wrap; /* Mozilla, since 1999 */
white-space: -pre-wrap; /* Opera 4-6 */
white-space: -o-pre-wrap; /* Opera 7 */
word-wrap: break-word; /* Internet Explorer 5.5+ */
}
canvas{
image-rendering: pixelated;
}
</style>
</head>
<body>
<a href="https://github.com/LingDong-/skeleton-tracing" class="github-corner" aria-label="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#666; color:#000; position: absolute; top: 0; border: 0; left: 0; transform: scale(-1, 1);" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>
<div id="content">
<h1>Skeleton Tracing</h1>
<h2>
A new algorithm for retrieving topological skeleton as a set of polylines from binary images.
</h2>
<br>
<br>
<select id="sel">
<option>SELECT DEMO</option>
<option value="1">Single Image</option>
<option value="2">Webcam</option>
<option value="3">Random CJK</option>
<option value="4">Freehand</option>
<option value="5">Vandalize</option>
</select>
<input type="checkbox" id="chk" checked> <small style="color:gray">Use WebAssembly Acceleration</small>
<pre id="readme"></pre>
</div>
</body>
<script src="https://cdn.jsdelivr.net/npm/skeleton-tracing-wasm/build/trace_skeleton_wasm.js"></script>
<script>
(async function loadTraceSkeletonWasm(){
TraceSkeletonWASM = await TraceSkeleton.load();
})();
</script>
<script src="https://cdn.jsdelivr.net/npm/skeleton-tracing-js/dist/trace_skeleton.min.js"></script>
<script>
TraceSkeletonVanilla=TraceSkeleton;try{TraceSkeleton=TraceSkeletonWASM}catch(e){}
</script>
<script defer>
var TOP = 200;
var LEFT= "calc(50% - 400px)";
var DWIDTH = 800;
var is_safari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
var canv = document.createElement("canvas");
var ctx = canv.getContext('2d');
canv.style = `position:absolute;left:${LEFT};top:${TOP}px;width:${DWIDTH}px;border:1px solid rgb(30,30,30)`;
document.body.appendChild(canv);
var div = document.createElement("div");
div.style = `position:absolute;left:${LEFT};top:${TOP}px;pointer-events:none`;
document.body.appendChild(div)
var animReq;
function fromImageUrl(url){
var img = new Image();
img.src = url;
img.onload = function(){
canv.width = img.width;
canv.height = img.height;
ctx.drawImage(img,0,0);
var s = TraceSkeleton.fromCanvas(canv);
var r = s.rects;
var p = s.polylines;
var v = TraceSkeleton.visualize(s,{scale:DWIDTH/img.width,strokeWidth:4});
div.innerHTML = v;
}
}
function fromWebcam(){
var vid = document.createElement("video");
vid.playsinline="playsinline"
vid.autoplay="autoplay"
navigator.mediaDevices.getUserMedia({audio:false,video:true}).then(function(stream){
window.stream = stream;
vid.srcObject = stream;
})
vid.style.position="absolute"
vid.style.opacity=0;
vid.style.pointerEvents="none";
vid.style.zIndex = -1000;
canv.width = vid.videoWidth = 360;
canv.height = vid.videoHeight = 240;
ctx.filter = "blur(5px)";
document.body.appendChild(vid);
function loop(){
animReq = requestAnimationFrame(loop);
// setTimeout(loop,1000);
ctx.drawImage(vid,0,0,canv.width,canv.height);
var imdata = ctx.getImageData(0,0,canv.width,canv.height);
var data = imdata.data;
var str = "";
var avg = 0;
var n = (canv.width*canv.height);
for (var i = 0; i < data.length; i+=4){
avg += data[i]/n;
}
for (var i = 0; i < data.length; i+=4){
var x = (i/4)%canv.width;
var y = Math.floor((i/4)/canv.width);
var c = 0;
if (is_safari){//stupid safari doesn't support blur
for (var k = y-3; k <= y+3; k++){
for (var l = x-3; l <= x+3; l++){
c+=data[(k*canv.width+l)*4]
}
}
c/=49;
}else{
var c = (data[i]+data[i+1]+data[i+2])/3;
}
// var d = 1-Math.sqrt(Math.pow(x-canv.width/2,2)+Math.pow(y-canv.height/2,2))/((canv.width+canv.height)/0.75);
var g = Math.min(Math.max(c*1.5,128),255);
if (x<1||x>canv.width-2||y<1||y>canv.height-2){
c=0;
g=c;
}
if (c > avg){
str += "\1";
}else{
str += "\0";
g = 0;
}
data[i]=g;
data[i+1]=g;
data[i+2]=g;
}
ctx.putImageData(imdata,0,0);
var s = TraceSkeleton.fromCharString(str,canv.width,canv.height);
// console.log(s)
var v = TraceSkeleton.visualize(s,{scale:DWIDTH/canv.width,strokeWidth:4,keypoints:true});
div.innerHTML = v;
}
loop();
}
function fromUnicode(){
canv.width = 270;
canv.height = 150;
var t1 = ""; var t2 = "";
function ct1(){
setTimeout(ct1,1)
t1 = String.fromCharCode(0x4e00+Math.floor(Math.random()*(0x9fff-0x4e00)));
}
function ct2(){
setTimeout(ct2,1000);
t2 = String.fromCharCode(0x4e00+Math.floor(Math.random()*(0x9fff-0x4e00)));
}
ct1();
ct2();
function loop(){
animReq = requestAnimationFrame(loop);
ctx.fillStyle="black";
ctx.fillRect(0,0,300,300);
ctx.fillStyle="white"
if (Math.random)
ctx.font="160px Kaiti TC";
ctx.fillText(t1,0,120);
ctx.fillText(t2,105,120);
var imdata = ctx.getImageData(0,0,canv.width,canv.height);
var data = imdata.data;
var str = "";
for (var i = 0; i < data.length; i+=4){
if (data[i] > 128){
str += "\1";
}else{
str += "\0";
}
}
var s = TraceSkeleton.fromCharString(str,canv.width,canv.height);
// console.log(s)
var v = TraceSkeleton.visualize(s,{scale:DWIDTH/canv.width,strokeWidth:4,keypoints:true});
div.innerHTML = v;
}
loop();
}
function fromDrawing(url){
if (url){
var img = new Image();
img.src = url;
img.onload = function(){
canv.width = img.width;
canv.height = img.height;
ctx.drawImage(img,0,0);
}
}
canv.width = 200;
canv.height = 200;
var mouseX =-1;
var mouseY =-1;
var pmouseX=-1;
var pmouseY=-1;
canv.addEventListener("mousemove",function(e){
if (mouseX != -1){
pmouseX = mouseX;
pmouseY = mouseY;
}
mouseX = (e.clientX-canv.offsetLeft+window.scrollX)/(DWIDTH/canv.width);
mouseY = (e.clientY-canv.offsetTop+window.scrollY)/(DWIDTH/canv.width);
})
ctx.fillRect(0,0,canv.width,canv.height);
function loop(){
animReq = requestAnimationFrame(loop);
ctx.strokeStyle="white";
// ctx.lineWidth=Math.min(Math.max(Math.sqrt(Math.pow(pmouseX-mouseX,2)+Math.pow(pmouseY-mouseY,2))*1,2),10);
ctx.lineWidth=8;
ctx.lineCap="round"
if (pmouseX !=-1){
ctx.beginPath();
ctx.moveTo(pmouseX,pmouseY);
ctx.lineTo(mouseX,mouseY);
ctx.stroke();
}
var imdata = ctx.getImageData(0,0,canv.width,canv.height);
var data = imdata.data;
var str = "";
for (var i = 0; i < data.length; i+=4){
var x = (i/4)%canv.width;
var y = Math.floor((i/4)/canv.width);
if (x<1||x>canv.width-2||y<1||y>canv.height-2){
str+="\0";
continue;
}
if (data[i] > 128){
str += "\1";
}else{
str += "\0";
}
}
var s = TraceSkeleton.fromCharString(str,canv.width,canv.height);
var v = TraceSkeleton.visualize(s,{scale:DWIDTH/canv.width,strokeWidth:4,keypoints:true});
div.innerHTML = v;
}
loop();
}
(function adjustReadme(){
document.getElementById("readme").style.paddingTop=(canv.offsetHeight+50)+"px"
setTimeout(adjustReadme,500);
})()
fetch('README.md').then(function (response) {
return response.text();
}).then(function (data) {
document.getElementById("readme").innerHTML =
("Available in all your favorite programming languages! C, C++, Java, JavaScript, Python, C#/Unity, Processing, OpenFrameworks. Check out the [Github repo](https://github.com/LingDong-/skeleton-tracing).\n\n"
+"##"+data.split("##").slice(1).join("##"))
.replace(/\[(.*?)\]\((.*?)\)/g,`<a href="$2">$1</a>`);
}).catch(function (err) {
console.warn('Something went wrong.', err);
});
// fromDrawing();
fromDrawing("test_images/horse_r.png")
document.getElementById("sel").onchange = function(){
cancelAnimationFrame(animReq);
var v = document.getElementById("sel").value;
if (v=="1"){
fromImageUrl("test_images/opencv-thinning-src-img.png")
}else if (v=="2"){
fromWebcam();
}else if (v=="3"){
fromUnicode();
}else if (v=="4"){
fromDrawing();
}else if (v=="5"){
fromDrawing("test_images/horse_r.png");
}
}
document.getElementById("chk").onclick=function(){
var c = document.getElementById("chk").checked;
if (c){
TraceSkeleton=TraceSkeletonWASM;
}else{
TraceSkeleton=TraceSkeletonVanilla;
}
}
</script>