Accessing OMR Scanner through web application

I want to access OMR Scanner through web application. I have search for it in google and found ScanTool SDK, but I am looking for similar functionality but open source. My basic requirement is below:

• There will a web interface for the user.
• User can select OMR scanner from the web page drop-down.
• User can do the scanning of the document

NOTE: I have seen similar functionality for TWAIN scanner. But I want it for OMR scanner. As TWAIN scanner generate image data but OMR scanner generate image as well as raw data of response present in OMR sheet.