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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Align & Optimize</title>
<style>
body{font-family:sans-serif;text-align:center;background:#f5f5f5}
canvas{border:1px solid #ccc;margin-top:10px;cursor:grab}
</style>
</head>
<body>
<h3>Align & Optimize (Arrows=move, Shift+Arrows=scale)</h3>
<input type="file" id="f1" accept="image/*">
<input type="file" id="f2" accept="image/*"><br><br>
Alpha <input type="range" id="alpha" min="0.2" max="1" step="0.01" value="0.5">
<br><br>
<button id="crop">Crop</button>
<button id="opt">Optimize</button>
<button id="dl" disabled>Download</button>
<div>MSE: <span id="score">-</span></div>
<canvas id="c"></canvas>
<script>
const c=document.getElementById('c'),x=c.getContext('2d');
let i1=new Image(),i2=new Image(),l1=0,l2=0;
let ox=0,oy=0,sx=1,sy=1;
let drag=0,lx,ly,mx=0,my=0,a=document.getElementById('alpha');
let out1,out2;
// finer than before
const PAN_STEP=0.3;
const SCALE_STEP=0.002; // 🔬 very fine zoom
const DRAG_SPEED=0.4;
// MSE buffers (reused)
let buf1=document.createElement('canvas');
let buf2=document.createElement('canvas');
let b1=buf1.getContext('2d');
let b2=buf2.getContext('2d');
const SAMPLE=128;
// load images
f1.onchange=e=>{
i1=new Image();
i1.onload=()=>{
l1=1;c.width=i1.width;c.height=i1.height;
ox=oy=0;sx=sy=1;draw();
};
i1.src=URL.createObjectURL(e.target.files[0]);
};
f2.onchange=e=>{
i2=new Image();
i2.onload=()=>{
l2=1;
ox=(c.width-i2.width)/2;
oy=(c.height-i2.height)/2;
sx=sy=1;draw();
};
i2.src=URL.createObjectURL(e.target.files[0]);
};
function draw(){
if(!l1)return;
x.clearRect(0,0,c.width,c.height);
x.drawImage(i1,0,0);
if(l2){
x.save();
x.globalAlpha=a.value;
x.translate(ox,oy);
x.scale(sx,sy);
x.drawImage(i2,0,0);
x.restore();
}
updateScore();
}
// --- FAST MSE ---
function computeMSE(){
let x2=ox,y2=oy,w2=i2.width*sx,h2=i2.height*sy;
let x0=Math.max(0,x2),y0=Math.max(0,y2);
let x1=Math.min(c.width,x2+w2),y1=Math.min(c.height,y2+h2);
let w=Math.floor(x1-x0),h=Math.floor(y1-y0);
if(w<=0||h<=0)return Infinity;
let scale=Math.min(1,SAMPLE/Math.max(w,h));
let sw=Math.max(1,Math.floor(w*scale));
let sh=Math.max(1,Math.floor(h*scale));
buf1.width=buf2.width=sw;
buf1.height=buf2.height=sh;
b1.drawImage(i1,x0,y0,w,h,0,0,sw,sh);
b2.drawImage(i2,(x0-ox)/sx,(y0-oy)/sy,w/sx,h/sy,0,0,sw,sh);
let d1=b1.getImageData(0,0,sw,sh).data;
let d2=b2.getImageData(0,0,sw,sh).data;
let mse=0,n=sw*sh;
for(let i=0;i<d1.length;i+=4){
let g1=0.299*d1[i]+0.587*d1[i+1]+0.114*d1[i+2];
let g2=0.299*d2[i]+0.587*d2[i+1]+0.114*d2[i+2];
let d=g1-g2;
mse+=d*d;
}
return mse/n;
}
function updateScore(){
if(l1&&l2){
let s=computeMSE();
score.textContent=isFinite(s)?s.toFixed(2):"-";
}
}
// mouse
c.onmousemove=e=>{
mx=e.offsetX;my=e.offsetY;
if(!drag)return;
ox+=(e.offsetX-lx)*DRAG_SPEED;
oy+=(e.offsetY-ly)*DRAG_SPEED;
lx=e.offsetX;ly=e.offsetY;
draw();
};
c.onmousedown=e=>{drag=1;lx=e.offsetX;ly=e.offsetY;c.style.cursor="grabbing";}
c.onmouseup=c.onmouseleave=()=>{drag=0;c.style.cursor="grab";};
a.oninput=draw;
// keyboard
document.onkeydown=e=>{
if(!l2)return;
if(["ArrowUp","ArrowDown","ArrowLeft","ArrowRight"].includes(e.key)) e.preventDefault();
if(e.shiftKey){
// scale around mouse
let ix=(mx-ox)/sx,iy=(my-oy)/sy;
if(e.key==="ArrowRight") sx+=SCALE_STEP;
if(e.key==="ArrowLeft") sx-=SCALE_STEP;
if(e.key==="ArrowUp") sy+=SCALE_STEP;
if(e.key==="ArrowDown") sy-=SCALE_STEP;
ox=mx-ix*sx;
oy=my-iy*sy;
} else {
// move
if(e.key==="ArrowRight") ox+=PAN_STEP;
if(e.key==="ArrowLeft") ox-=PAN_STEP;
if(e.key==="ArrowUp") oy-=PAN_STEP;
if(e.key==="ArrowDown") oy+=PAN_STEP;
}
draw();
};
// --- OPTIMIZER (safe + fast) ---
opt.onclick=async ()=>{
if(!l1||!l2)return;
let best={ox,oy,sx,sy,score:computeMSE()};
for(let iter=0;iter<10;iter++){
let stepO=0.5/(iter+1);
let stepS=0.005/(iter+1);
let valuesO=[-stepO,-stepO/2,0,stepO/2,stepO];
let valuesS=[-stepS,-stepS/2,0,stepS/2,stepS];
for(let dx of valuesO)
for(let dy of valuesO)
for(let dsx of valuesS)
for(let dsy of valuesS){
let tox=best.ox+dx;
let toy=best.oy+dy;
let tsx=best.sx+dsx;
let tsy=best.sy+dsy;
ox=tox;oy=toy;sx=tsx;sy=tsy;
let s=computeMSE();
if(s<best.score){
best={ox:tox,oy:toy,sx:tsx,sy:tsy,score:s};
}
}
ox=best.ox;oy=best.oy;sx=best.sx;sy=best.sy;
draw();
await new Promise(r=>setTimeout(r,0)); // keep UI responsive
}
};
// crop + download
crop.onclick=()=>{
let x2=ox,y2=oy,w2=i2.width*sx,h2=i2.height*sy;
let x0=Math.max(0,x2),y0=Math.max(0,y2);
let x1=Math.min(c.width,x2+w2),y1=Math.min(c.height,y2+h2);
let w=x1-x0,h=y1-y0;
if(w<=0||h<=0)return alert("no overlap");
out1=document.createElement('canvas');
out2=document.createElement('canvas');
out1.width=out2.width=w;
out1.height=out2.height=h;
out1.getContext('2d').drawImage(i1,x0,y0,w,h,0,0,w,h);
out2.getContext('2d').drawImage(i2,(x0-ox)/sx,(y0-oy)/sy,w/sx,h/sy,0,0,w,h);
dl.disabled=0;
};
dl.onclick=()=>{
let d=(cv,n)=>{
let a=document.createElement('a');
a.download=n+'.clipped.png';
a.href=cv.toDataURL();
a.click();
};
d(out1,'image1');d(out2,'image2');
};
</script>
</body>
</html>
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