Is it possible to obtain the Thresholded Image from tesseract? #588
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This library does not currently include an interface for retrieving the thresholded image. It's theoretically possible to do so using low-level functions to read the contents of the wasm filesystem and/or memory--but not something we currently support with high-level functions. Feel free to thumbs up this issue if you're reading this and would use this feature if added--can probably add in a future release if there's enough demand. |
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@diogoalmiro This feature has been added in the development branch for version 4 and will be included in that release. That branch is functional at present if you would like to try it out, and is described in more detail in #662. An example has also been included to demonstrate usage. |
See #662 for explanation of Tesseract.js Version 4 changes. List below is auto-generated from commits. * Added image preprocessing functions (rotate + save images) * Updated createWorker to be async * Reworked createWorker to be async and throw errors per #654 * Reworked createWorker to be async and throw errors per #654 * Edited detect to return null when detection fails rather than throwing error per #526 * Updated types per #606 and #580 (#663) (#664) * Removed unused files * Added savePDF option to recognize per #488; cleaned up code for linter * Updated download-pdf example for node to use new savePDF option * Added OutputFormats option/interface for setting output * Allowed for Tesseract parameters to be set through recognition options per #665 * Updated docs * Edited loadLanguage to no longer overwrite cache with data from cache per #666 * Added interface for setting 'init only' options per #613 * Wrapped caching in try block per #609 * Fixed unit tests * Updated setImage to resolve memory leak per #678 * Added debug output option per #681 * Fixed bug with saving images per #588 * Updated examples * Updated readme and Tesseract.js-core version
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Closing as this was added in Version 4. |
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@Balearica I see the example is for browser but can you retrieve the created "threshold" images with Node as well? Thanks |
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@GitMurf Yes, you can also do this on Node. You should be able to adapt the browser example fairly easily. |
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@Balearica thanks a ton! This is exactly what I needed :) Much appreciated! |
I would like to have access to the thresholded image created by tesseract. (See function: GetThresholdedImage)
This feature is implemented by the tesseract wrapper library for pyton as a function: https://github.com/sirfz/tesserocr/blob/master/tesserocr.pyx#L1737
There is also a parameter that writes the thresholded image to the file "tessinput.tif": "tessedit_write_images".
I am using win10 and NodeJS with some tiff files, setting the parameter "tessedit_write_images" to "T" or "1" does nothing.
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