Sourced from tesseract.js's releases.

v5.0.0

What's Changed

Major New Features

1. Significantly smaller file sizes
   1. 54% smaller file sizes for English, 73% smaller for Chinese (see #806 for details)
   2. This results in a ~50% decrease in runtime for first-time users (who do not yet have the data downloaded/cached)
2. Significantly lower memory usage
   1. Worker memory utilization in the web benchmark is reduced from 311 MB to 164 MB (47% reduction)
   2. The lower memory footprint makes it feasible to use more workers, significantly improving performance for projects that utilize schedulers for parallel processing
3. Compatible with iOS 17 (using default settings)
   1. iOS 17 broke compatibility with Tesseract.js v4--upgrading to v5 should resolve
      1. See discussion section below for details

Breaking Changes Impacting Many Users

1. createWorker arguments changed
   1. Setting non-default language and OEM now happens in createWorker
      1. E.g. createWorker("chi_sim", 1)
2. worker.initialize and worker.loadLanguage functions now do nothing and can be deleted from code
   1. Loading the language and initialization now occurs in createWorker
   2. Workers can be re-initialized with different settings using worker.reinitialize

In other words, code should be modified from this:

const worker = await Tesseract.createWorker();
await worker.loadLanguage('eng');
await worker.initialize('eng');
const ret = await worker.recognize(file);

To this:

const worker = await Tesseract.createWorker("eng");
const ret = await worker.recognize(file);

Breaking Changes Impacting Fewer Users

1. Users who manually set corePath will need to update the contents of their corePath directory
   1. corePath should point to a directory that contains all 4 of the files below from Tesseract.js-core v5:
      1. tesseract-core.wasm.js
      2. tesseract-core-simd.wasm.js
      3. tesseract-core-lstm.wasm.js
      4. tesseract-core-simd-lstm.wasm.js
   2. Tesseract.js will automatically select the correct version to use
2. worker.detect function disabled by default
   1. Orientation + script detection is a function of the Legacy model only, which is no longer included by default
   2. To enable, set arguments legacyCore: true and legacyLang: true in createWorker options
      1. E.g. Tesseract.createWorker("eng", 1, {legacyCore: true, legacyLang: true});

... (truncated)

• 3474d07 5.0.0
• 9edd64a Updated lockfile
• 4af569b Removed node: prefixes to restore compatability with Node.js v14
• 7f914da Updated package-lock file
• 6ebe92f Update to v5 (#830)
• See full diff in compare view

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