Franz Enzenhofer has put together this novel search-by-image page for use with Google. This is Franz’s own work and is not affiliated with or supported by Google. He’s confirmed it works on Chrome, Safari, Firefox on Mac and Firefox on Windows XP. It does not work on mobile devices.
Franz describes the inner workings as follows: “You draw something on an HTML5 canvas and Click on Search. The image gets converted into a base64 encoded data url. The image data gets sent to server (powered by Heroku). Image gets uploaded to Amazon S3. The Amazon S3 Image URL gets communicated back to your browser. Your browser gets redirected to Google Search by Image.”
Not good at drawing? You can snap a photo using your webcam and use it to generate your search.
If you want to check out this MIT licensed code project, visit Franz’s SearchByDrawing GitHub page.