Scanning without taking pictures in BlackBerry OS 6

I'm working on a pro开发者_StackOverflow中文版ject that requires me to use the video control. My goal is to turn the camera on and use it to scan some words. I don't want to take pictures out of it. I would need to capture the image automatically when the image is focused instead of having the users taking pictures by pressing the button. What I have in mind right now is there is a state where your camera auto-focuses, if I can somehow catch that state and take the snapshot, then I don't have to ask the user to take a picture. I have no idea how to achieve this. Can anyone shed some light on me please?

If any of you have used something like a barcode scanner like barcode assistant or the canadian tire app, I want something like that.

Thank you in advance!

You'll find this BlackBerry Developer Documentation article useful:
Take a picture in a BlackBerry device application