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=== Plugin Name === | ||
=== OCR === | ||
Contributors: formasfunction | ||
Donate link: http://formasfunction.com | ||
Tags: ocr, images, optical text recognition, attachments | ||
Tags: ocr, optical text recognition, images, attachments, media | ||
Requires at least: 2.9 | ||
Tested up to: 2.9 | ||
Stable tag: 0.01 | ||
Stable tag: 0.1.0 | ||
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A plugin for extracting the text from attached images using OCR via Tesseract. | ||
A plugin for extracting text from attached images using OCR via Tesseract. | ||
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== Description == | ||
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A plugin for extracting the text from attached images using OCR via Tesseract. | ||
A plugin for extracting text from attached images using [OCR](http://en.wikipedia.org/wiki/Optical_character_recognition) via [Tesseract](http://code.google.com/p/tesseract-ocr/). | ||
This plugin adds a field to each image upload named 'OCR Text' containing the recognized text characters within the file. | ||
This text can then be edited for accuracy and added to images to improve search and SEO results. | ||
Requires both Tesseract (http://code.google.com/p/tesseract-ocr/) and ImageMagick (http://www.imagemagick.org) installed on the server. | ||
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The OCR plugin requires [PHP5](http://php.net/) and two command line utilities: | ||
[ImageMagick](http://www.imagemagick.org) for preparing the images and [Tesseract](http://code.google.com/p/tesseract-ocr/) for the actual OCR. | ||
These utilities must be manually installed on your server and executable by PHP. **This process, and consequently this plugin, is recommended only for advanced users.** | ||
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== Installation == | ||
1. Install Tesseract OCR on your server (http://code.google.com/p/tesseract-ocr/) | ||
2. Install ImageMagick on your server (http://www.imagemagick.org) | ||
3. Upload `ocr.php` to the `/wp-content/plugins/` directory | ||
4. Activate the plugin through the 'Plugins' menu in WordPress | ||
5. Configure the plugin through 'Plugins > OCR Plugin' in the sidebar menu in WordPress | ||
4. Activate the plugin through the `Plugins` menu in WordPress | ||
5. Configure the plugin through the `Plugins > OCR` link in the sidebar menu in WordPress | ||
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== Frequently Asked Questions == | ||
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= What is Tesseract OCR and where do I get it? = | ||
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Tesseract OCR is an open source [optical character recognition](http://en.wikipedia.org/wiki/Optical_character_recognition) library that | ||
the WordPress OCR plugin uses to extract text from images. | ||
The library as well as installation instructions can be found at | ||
http://code.google.com/p/tesseract-ocr/ | ||
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= How do I know if / where I have Tesseract installed on my server? = | ||
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Linux: | ||
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1. SSH into your server and type `which tesseract`. | ||
2. If Tesseract is installed and in your shell environment PATH the terminal should return a path similar to `/opt/local/bin/tesseract`. | ||
3. Place this path in the configuration of the OCR plugin through the `Plugins > OCR` link in the sidebar menu in WordPress | ||
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= What is ImageMagick and where do I get it? = | ||
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ImageMagick is a an open source, server side, image manipulation library. | ||
The WordPress OCR plugin requires the `convert` utility specifically. | ||
The library as well as installation instructions can be found at | ||
http://www.imagemagick.org | ||
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= How do I know if / where I have ImageMagick installed on my server? = | ||
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Linux: | ||
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1. SSH into your server and type `which convert`. | ||
2. If ImageMagick is installed and in your shell environment PATH the terminal should return a path similar to `/opt/local/bin/convert`. | ||
3. Place this path in the configuration of the OCR plugin through the `Plugins > OCR` link in the sidebar menu in WordPress | ||
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= Why does OCR require ImageMagick? = | ||
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Tesseract is only compatible with [TIFF](http://en.wikipedia.org/wiki/Tagged_Image_File_Format) images. | ||
Therefor, when a web formatted image (JPG, GIF, PNG, etc) is uploaded, a temporary TIFF image must be created via | ||
ImageMagick in order for Tesseract to detect the text within the image. This TIFF is discarded once the OCR has been completed. | ||
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= Where is the detected text stored? = | ||
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The text detected by the OCR plugin is added to the image as a [custom field](http://codex.wordpress.org/Custom_Fields) named `ocr_text`. | ||
See http://codex.wordpress.org/Custom_Fields for instructions on using the `ocr_text` field in your templates. | ||
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= Where can I edit the detected text? = | ||
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The text detected by the OCR plugin is available in a text area labeled 'OCR Text' both in the 'Add an Image' | ||
model while attaching an image to a post and while editing a previously uploaded image under the 'Media' section of your WordPress install. | ||
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= What is the 'Resize percentage' configuration option? = | ||
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The OCR plugin is tailored to detecting text in images with ~12pt text at 72dpi. | ||
ImageMagick is used to upscale the temporary TIFF images fed to Tesseract as Tesseract is generally more accurate with | ||
larger type, even if it's been upscaled from a smaller source. If you wish to disable this option simply set this | ||
configuration option to `100%` and no resizing will occur. | ||
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= Will the OCR plugin work on versions of WordPress other than 2.9? = | ||
Possibly. The OCR plugin simply hasn't been tested on any other versions. | ||
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== Changelog == | ||
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= 0.01 = | ||
= 0.1.0 = | ||
Initial Release. |