优化后端

tmp/ambient-matrix-inspect/node_modules/tesseract.js/examples/node/download-pdf.js

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+#!/usr/bin/env node
+
+'use strict';
+
+const path = require('path');
+const fs = require('fs');
+const { createWorker } = require('../..');
+
+const [,, imagePath] = process.argv;
+const image = path.resolve(__dirname, (imagePath || '../../tests/assets/images/cosmic.png'));
+
+console.log(`Recognizing ${image}`);
+
+(async () => {
+  const worker = await createWorker();
+  const { data: { text, pdf } } = await worker.recognize(image, { pdfTitle: 'Example PDF' }, { pdf: true });
+  console.log(text);
+  fs.writeFileSync('tesseract-ocr-result.pdf', Buffer.from(pdf));
+  console.log('Generate PDF: tesseract-ocr-result.pdf');
+  await worker.terminate();
+})();

tmp/ambient-matrix-inspect/node_modules/tesseract.js/examples/node/image-processing.js

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+#!/usr/bin/env node
+
+'use strict';
+
+const path = require('path');
+const fs = require('fs');
+const { createWorker } = require('../..');
+
+const [,, imagePath] = process.argv;
+const image = path.resolve(__dirname, (imagePath || '../data/meditations.jpg'));
+
+console.log(`Recognizing ${image}`);
+
+// Tesseract.js returns images (imageColor, imageGrey, imageBinary) as strings
+// to be used as source tags.
+// This function converts to Uint8Array data for saving to disk.
+const convertImage = (imageSrc) => {
+  const data = atob(imageSrc.split(',')[1])
+    .split('')
+    .map((c) => c.charCodeAt(0));
+
+  return new Uint8Array(data);
+};
+
+(async () => {
+  const worker = await createWorker();
+  const { data: { imageColor, imageGrey, imageBinary } } = await worker.recognize(image,
+    { rotateAuto: true }, { imageColor: true, imageGrey: true, imageBinary: true });
+
+  console.log('Saving intermediate images: imageColor.png, imageGrey.png, imageBinary.png');
+
+  fs.writeFileSync('imageColor.png', convertImage(imageColor));
+  fs.writeFileSync('imageGrey.png', convertImage(imageGrey));
+  fs.writeFileSync('imageBinary.png', convertImage(imageBinary));
+
+  await worker.terminate();
+})();

tmp/ambient-matrix-inspect/node_modules/tesseract.js/examples/node/recognize.js

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+#!/usr/bin/env node
+
+'use strict';
+
+const path = require('path');
+const { createWorker } = require('../..');
+
+const [,, imagePath] = process.argv;
+const image = path.resolve(__dirname, (imagePath || '../../tests/assets/images/cosmic.png'));
+
+console.log(`Recognizing ${image}`);
+
+(async () => {
+  const worker = await createWorker('eng', 1, {
+    logger: (m) => console.log(m),
+  });
+  const { data: { text } } = await worker.recognize(image);
+  console.log(text);
+  await worker.terminate();
+})();

tmp/ambient-matrix-inspect/node_modules/tesseract.js/examples/node/scheduler.js

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+'use strict';
+
+const path = require('path');
+const { createWorker, createScheduler } = require('../..');
+
+const [,, imagePath] = process.argv;
+
+// Note: This example recognizes the same image 4 times in parallel
+// to show how schedulers can be used to speed up bulk jobs.
+// In actual use you would (obviously) not want to run multiple identical jobs.
+
+const image = path.resolve(__dirname, (imagePath || '../../tests/assets/images/cosmic.png'));
+const imageArr = [image, image, image, image];
+
+const scheduler = createScheduler();
+
+// Creates worker and adds to scheduler
+const workerGen = async () => {
+  const worker = await createWorker('eng', 1, { cachePath: '.' });
+  scheduler.addWorker(worker);
+};
+
+const workerN = 4;
+(async () => {
+  const resArr = Array(workerN);
+  for (let i = 0; i < workerN; i++) {
+    resArr[i] = workerGen();
+  }
+  await Promise.all(resArr);
+
+  const resArr2 = Array(imageArr.length);
+
+  for (let i = 0; i < imageArr.length; i++) {
+    resArr2[i] = scheduler.addJob('recognize', image).then((x) => console.log(x.data.text));
+  }
+
+  await Promise.all(resArr2);
+
+  await scheduler.terminate(); // It also terminates all workers.
+})();