Created
June 1, 2021 02:58
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Cloud Function to Extract Text from Image - works in server hosted
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| /** | |
| * sudo yum install tesseract-ocr | |
| * | |
| npm init | |
| npm i express node-tesseract-ocr | |
| MINIO_FOLDER=/mnt/data node function-ocr.js | |
| MINIO_FOLDER=/mnt/data pm2 start function-ocr.js --name | |
| * | |
| curl http://localhost:9001/functions/ocr?object=bucket/image.jpg | |
| curl http://minio.domain.com/functions/ocr?object=bucket/image.jpg | |
| * | |
| server { | |
| server_name minio.domain.com; | |
| locations /functions { | |
| proxy_pass http://127.0.0.1:9001; | |
| } | |
| } | |
| * | |
| */ | |
| const http = require('http'); | |
| const express = require('express'); | |
| const tesseract = require("node-tesseract-ocr") | |
| const port = process.env.PORT || 9001; | |
| const ip = '0.0.0.0'; | |
| const FILES_ROOT = process.env.SFS_FOLDER; | |
| const app = express(); | |
| const server = http.createServer(app); | |
| function startServer() { | |
| console.log('startServer...') | |
| return new Promise((res, rej) => { | |
| return server.listen(port, ip, (err) => { | |
| if (err) return rej(err); | |
| app.emit('appStarted'); | |
| return res(); | |
| }); | |
| }); | |
| } | |
| app.get('/functions/ocr', async (req, res) => { | |
| console.log('ocr', req.query.object); | |
| try { | |
| const object = req.query.object; | |
| const text = await tesseract.recognize(`${FILES_ROOT}/${object}`, { lang: "eng", oem: 1, psm: 3}) | |
| return res.json({ | |
| text, | |
| }) | |
| } catch (err) { | |
| console.error(err); | |
| return res.status(500).json(err); | |
| } | |
| }) | |
| app.on('appStarted', () => { | |
| console.log('API: Express server listening on %d, in %s mode', port, app.get('env')); | |
| }); | |
| startServer(); |
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