1. WebInSight Goals Automatically add alt text to webpages Coordinate multiple labeling sources Receive and process labeling requests Do all without harming user experience Maintain security and privacy

2. Database WebInSight Architecture The Internet Context Labeling OCR Labeling Labeling Services Transformation Proxy GET http://www.cs.washington.edu

3. Transformation Proxy Implemented as a transformation proxy  Inserts alt text into webpages  Inserts AJAX hooks to allow later changes Disadvantages  Potentially a bottleneck  Less control over user interface Advantages  Centralized control  Simple setup and administration