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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Transparent Signature</title>
</head>
<body>
<div style="position: relative; overflow: hidden;">
<div>
<img src="" alt="" id="original-image">
</div>
<div style="position: absolute; box-shadow: inset 0px 0px 1px red;">
<img src="" alt="" id="your-img-element-id" style="">
</div>
</div>
<button
onclick="window.location=document.querySelector('#your-img-element-id').getAttribute('src')">Capture</button>
</body>
<script>
// Mendapatkan akses ke kamera video
var imgElement = document.getElementById('your-img-element-id');
var imgElementOri = document.getElementById('original-image');
var fps = 25; // Framerate yang diinginkan
var now;
var then = Date.now();
var interval = 1000 / fps;
var delta;
let opt = {
color: {
red: 0,
green: 10,
blue: 255
},
contrast: 40,
threshold: 120
}
navigator.mediaDevices.getUserMedia({ video: true })
.then(function (stream) {
var video = document.createElement('video');
video.srcObject = stream;
video.onloadedmetadata = function () {
video.play();
// Membuat canvas untuk menggambar frame video dan mengubahnya menjadi negatif
var canvas = document.createElement('canvas');
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
imgElementOri.style.width = video.videoWidth + 'px';
imgElementOri.style.height = video.videoHeight + 'px';
imgElementOri.parentNode.style.width = video.videoWidth + 'px';
imgElementOri.parentNode.style.height = video.videoHeight + 'px';
var ctx = canvas.getContext('2d');
// Fungsi untuk menggambar frame video dan mengubahnya menjadi negatif
function drawFrame() {
now = Date.now();
delta = now - then;
if (delta > interval) {
// Update waktu terakhir frame ditarik
then = now - (delta % interval);
// Tarik frame baru di sini
ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
var result = processSignature(video, video.videoWidth, video.videoHeight, opt);
// Menampilkan hasil negatif
imgElementOri.src = canvas.toDataURL();
imgElement.parentNode.style.left = (result.left - 0) + 'px';
imgElement.parentNode.style.top = (result.top - 0) + 'px';
imgElement.src = result.canvas.toDataURL();
}
requestAnimationFrame(drawFrame);
}
// Mulai menggambar frame video
drawFrame();
};
})
.catch(function (err) {
console.log('Gagal mendapatkan akses ke kamera video: ' + err);
});
function processSignature(img, imgWidth, imgHeight, opt) {
opt = opt || {};
var contrast = opt.contrast || 60; // Nilai kontras, bisa disesuaikan
let threshold = opt.threshold || 120;
let color = opt.color || {
red: opt.color.red || 0,
green: opt.color.green || 0,
blue: opt.color.blue || 0,
}
var canvas = document.createElement('canvas');
canvas.width = imgWidth;
canvas.height = imgHeight;
var ctx = canvas.getContext('2d');
ctx.drawImage(img, 0, 0, imgWidth, imgHeight);
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
var data = imageData.data;
var factor = (259 * (contrast + 255)) / (255 * (259 - contrast));
for (var i = 0; i < data.length; i += 4) {
data[i] = factor * (data[i] - 128) + 128; // Merah
data[i + 1] = factor * (data[i + 1] - 128) + 128; // Hijau
data[i + 2] = factor * (data[i + 2] - 128) + 128; // Biru
}
for (var i = 0; i < data.length; i += 4) {
// Jika pixel berwarna putih (atau mendekati putih)
if (data[i] > threshold && data[i + 1] > threshold && data[i + 2] > threshold) {
// Ubah pixel tersebut menjadi transparan
data[i + 3] = 0;
}
}
ctx.putImageData(imageData, 0, 0);
// Mencari batas trim
var top = null, bottom = null, left = null, right = null;
// mencari left
for (var x = 0; x < imgWidth && left == null; x++) {
for (var y = 0; y < imgHeight; y++) {
var alpha = data[(y * imgWidth + x) * 4 + 3];
if (alpha !== 0) {
left = x;
break;
}
}
}
// mencari right
for (var x = imgWidth - 1; x >= 0 && right == null; x--) {
for (var y = 0; y < imgHeight; y++) {
var alpha = data[(y * imgWidth + x) * 4 + 3];
if (alpha !== 0) {
right = x;
break;
}
}
}
// mencari top
for (var y = 0; y < imgHeight && top == null; y++) {
for (var x = 0; x < imgWidth; x++) {
var alpha = data[(y * imgWidth + x) * 4 + 3];
if (alpha !== 0) {
top = y;
break;
}
}
}
// mencari bottom
for (var y = imgHeight - 1; y >= 0 && bottom == null; y--) {
for (var x = 0; x < imgWidth; x++) {
var alpha = data[(y * imgWidth + x) * 4 + 3];
if (alpha !== 0) {
bottom = y;
break;
}
}
}
let maxColor = 255;
for (var x = left; x <= right; x++) {
for (var y = top; y <= bottom; y++) {
if (data[(y * imgWidth + x) * 4 + 3] > 0) {
var avg = parseInt((data[(y * imgWidth + x) * 4 + 0] + data[(y * imgWidth + x) * 4 + 1] + data[(y * imgWidth + x) * 4 + 2] / 3));
maxColor = Math.min(maxColor, avg);
}
}
}
for (var x = left; x <= right; x++) {
for (var y = top; y <= bottom; y++) {
if (data[(y * imgWidth + x) * 4 + 3] > 0) {
var avg = parseInt((data[(y * imgWidth + x) * 4 + 0] + data[(y * imgWidth + x) * 4 + 1] + data[(y * imgWidth + x) * 4 + 2] / 3));
if (data[(y * imgWidth + x) * 4 + 3] > 0) {
let alpha = Math.min(255, parseInt(255 - (avg - maxColor)));
data[(y * imgWidth + x) * 4 + 0] = color.red;
data[(y * imgWidth + x) * 4 + 1] = color.green;
data[(y * imgWidth + x) * 4 + 2] = color.blue;
data[(y * imgWidth + x) * 4 + 3] = alpha
}
}
}
}
var canvas2 = document.createElement('canvas');
canvas2.width = imgWidth;
canvas2.height = imgHeight;
var ctx2 = canvas.getContext('2d');
ctx2.putImageData(imageData, 0, 0);
// Membuat canvas baru untuk hasil trim
var trimCanvas = document.createElement('canvas');
trimCanvas.width = right - left + 1;
trimCanvas.height = bottom - top + 1;
var trimCtx = trimCanvas.getContext('2d');
// Mengambil data gambar dari area trim
var trimImageData = ctx2.getImageData(left, top, trimCanvas.width, trimCanvas.height);
// Menggambar data gambar ke canvas trim
trimCtx.putImageData(trimImageData, 0, 0);
return { canvas: trimCanvas, left: left, right: right, top: top, bottom: bottom };
}
</script>
</html>