tesseract.js
Version:
Pure Javascript Multilingual OCR
53 lines (52 loc) • 1.92 kB
HTML
<html>
<head>
<script src="/dist/tesseract.min.js"></script>
</head>
<body>
<div>
<input type="file" id="uploader">
<button id="download-pdf" disabled="true">Download PDF</button>
</div>
<textarea id="board" readonly rows="8" cols="80">Upload an image file</textarea>
<script type="module">
const { createWorker } = Tesseract;
const worker = await createWorker("eng", 1, {
corePath: '/node_modules/tesseract.js-core',
workerPath: "/dist/worker.min.js",
logger: m => console.log(m),
});
const uploader = document.getElementById('uploader');
const dlBtn = document.getElementById('download-pdf');
let pdf;
const recognize = async ({ target: { files } }) => {
const res = await worker.recognize(files[0],{pdfTitle: "Example PDF"},{pdf: true});
pdf = res.data.pdf;
const text = res.data.text;
const board = document.getElementById('board');
board.value = text;
dlBtn.disabled = false;
};
const downloadPDF = async () => {
const filename = 'tesseract-ocr-result.pdf';
const blob = new Blob([new Uint8Array(pdf)], { type: 'application/pdf' });
if (navigator.msSaveBlob) {
// IE 10+
navigator.msSaveBlob(blob, filename);
} else {
const link = document.createElement('a');
if (link.download !== undefined) {
const url = URL.createObjectURL(blob);
link.setAttribute('href', url);
link.setAttribute('download', filename);
link.style.visibility = 'hidden';
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
}
};
uploader.addEventListener('change', recognize);
dlBtn.addEventListener('click', downloadPDF);
</script>
</body>
</html>