Allows for adding Annotations to Images in MediaWiki
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Semantic Image Annotator

Semantic Image Annotator

The repository contains the Semantic Image Annotator extension for Semantic MediaWiki. The extension provides a plugin for capturing Image Annotations in Semantic MediaWiki of Uploaded Image Files.

Click here for a Demo.

Table of content



  • Download and extract the repository
  • Place the extracted folder in your extension folder of MediaWiki
  • Add the following code at the bottom of your LocalSettings.php:
    wfLoadExtension( 'SemanticImageAnnotator' );
  • To users running MediaWiki 1.24 or earlier: Add the folloding at the bottom of your LocalSettings.php:
    require_once "$IP/extensions/SemanticImageAnnotator/SemanticImageAnnotator.php";

Annotator Setup

  • Go to Special Pages and Click on Semantic Image Annotator under the Group Annotation
    • Remark: Only Users with sysops rights are allowed to access the page.
  • Click on the Install button to setup Semantic Image Annotator and refresh the Special Page
  • You can now Link PageForms to Annotation-Categories by using the Table on Special Page.

Special Page


Create Annotations

  • Go to an uploaded Image File (In the NameSpace 6)
  • On the top appears the Annotate Image Button. Click on it to start the Annotation Mode
  • Afterwards you can select an area. Afterwards appears a popup
  • You can enter a Comment to the Annotation and select an Annotation-Category (Linked by using the Special Page)
    • Remark: If the user has no permission to create/edit pages. Then the popup is disabled.
  • A popup appears to enter additional information, based on the selected PageForm
  • Click on save to store the annotation.

Create Annotation

Enter Information in PageForms

Edit Annotations

  • Mouseover an annotation. A popup appears. Click on the Edit button.

Edit Annotation

Delete Annotations

  • Mouseover an annotation. A popup appears. Click on the Delete button.

Query Annotations

  • The annotations are stored in a structured way.
  • Every annotated Image has its own overview page (Annotation:PAGENAME) which lists all annotations.
  • The following figure shows the query for listing all Pages for a certain Wiki page.

Query Annotation

Query Annotation


The Semantic Image Annotator is currently under the MIT License.


The idea of the Semantic Image Annotator is based on a by Felix Obenauer. For the Semantic Image Annotator is the JS Library annotorious used. Thank you to Roger Appleby and Karsten Hoffmeyer for supporting the extension and provding bug fixes.


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