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Search a specific pattern in the image #492

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ZioTano opened this issue Oct 26, 2020 · 5 comments
Closed

Search a specific pattern in the image #492

ZioTano opened this issue Oct 26, 2020 · 5 comments

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@ZioTano
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ZioTano commented Oct 26, 2020

A regex search would be a fantastic feature.
It could allow complex search in images.
it seems that a kind of that is already present in c++ branch of the project.
https://github.com/tesseract-ocr/tesseract/blob/442b5b7/dict/trie.h#L192
@Balearica
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This is blocked by #613 as it looks like this is an "init only" parameter.

@Balearica
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Balearica commented Sep 24, 2022 •
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Support for initialization parameters was added as part of #613 to the dev/v4 branch, and will be released with version 4. If you would like to test before then, instructions are in #662.

Regarding the user pattern feature specifically, I confirmed that this is supported using the sample image and pattern file provided in the Tesseract documentation.

Edit: This example is outdated. For an example that works with v5, see this comment below.

Here is a minimal example:

<!DOCTYPE HTML>
<html>
  <head>
    <script src="/dist/tesseract.dev.js"></script>
  </head>
  <body>
    <input type="file" id="uploader">
    <script>
      const recognize = async function(evt){
        const files = evt.target.files;
        const worker = await Tesseract.createWorker({
          corePath: '/tesseract-core-simd.wasm.js',
          workerPath: '/dist/worker.dev.js',
          logger: function(m){console.log(m);},
          cacheMethod: 'none',
        });
        await worker.loadLanguage('eng');
        await worker.writeText("/user_patterns_file", String.raw`\A\A\d\d\d\d\A`);
        await worker.initialize('eng', undefined, "user_patterns_file /user_patterns_file");
        const ret = await worker.recognize(files[0]);
        console.log(ret.data.text);
      }
      const elm = document.getElementById('uploader');
      elm.addEventListener('change', recognize);
    </script>
  </body>
</html>

[Note: at the time of this writing version 4 has not released yet. Therefore, workerPath and corePath must both be manually set to versions of those files from the dev/v4 branch of Tesseract.js and Tesseract.js-core, respectively.]

user_pattern_example

@Balearica
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Closing as this was added in Version 4.

@jlucaso1
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How i can do this in newer versions?

@Balearica
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@jlucaso1 An example that works with the latest version of Tesseract (v5.0.5) is below.

<!DOCTYPE HTML>
<html>
  <head>
    <script src="/dist/tesseract.min.js"></script>
  </head>
  <body>
    <input type="file" id="uploader">
    <script>
      const recognize = async function(evt){
        const files = evt.target.files;
        const worker = await Tesseract.createWorker('eng', 1);

        await worker.writeText("/user_patterns_file", String.raw`\A\A\d\d\d\d\A`);
        await worker.setParameters({user_patterns_file: "/user_patterns_file"})

        await worker.reinitialize('eng', 1, {user_patterns_file: "/user_patterns_file"})

        const ret = await worker.recognize(files[0]);
        console.log(ret.data.text);
      }
      const elm = document.getElementById('uploader');
      elm.addEventListener('change', recognize);
    </script>
  </body>
</html>

@Balearica Balearica mentioned this issue Apr 20, 2024
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@ZioTano @jlucaso1 @Balearica