Augmented reality with Optical character recognition

Question

I have implemented Augmented reality program using Qualcomm's vuforia library. Now I want to add Optical character recognition feature to my program so that i can translate the text from one language to another in real time. I am planning to use Tesseract OCR library. But my question is How do i Integrate Tesseract with QCAR? can some body suggest me proper way to do it?

Answer 1

What you need is an access to the camera frames, so you can send them to Tesseract. The Vuforia SDK offers a way to access the frames using the QCAR::UpdateCallback interface (documentation here).

What you need to do is create a class that implements this protocol, register it to the Vuforia SDK using the QCAR::registerCallback() (see here), and from there you'll get notified each time the Vuforia SDK has processed a frame.

This callback will be provided a QCAR::State object, from which you can get access to the camera frame (see the doc for QCAR::State::getFrame() here), and send it to the Tesseract SDK.

But be aware of the fact that the Vuforia SDK works with frames in a rather low resolution (on many phones I tested, it returns frames in the 360x240 to 720x480 range, and more often the former than the latter), which may not be accurate enough for Tesseract to detect text.