iSight auto exposure

Hi,

I'm working on a real-time image processing and recognition project using apple's built-in iSight camera. Its auto-exposure and auto-focus is really giving me a headache. I googled a lot, including search in Apple discussion, all I got so far is to use the iGlass program. I tried it and the "exposure lock" feature did work. Unfortunately, that is not an option for me.

Followed some tutorials, I'm using QTKit to capture video from iSight camera. I used QTCaptureDeviceInput, QTCaptureDecompressedVideoOutput, QTCaptureSession, etc, very basic stuff directly from the tutorial.

Is there a way to disable iSight's auto-exposure and auto-focus without using any 3rd party app?

Thanks in advance!

Jason