A am wondering if it is at all possible to hijack the video stream of a USB webcam via a microcontroller (STM32F103, Cortex M3, 73MHz) to add a HUD to the device. Then re-package the stream into the same USB endpoint plus a control endpoint?
I can not find any information what so ever on interfacing with a webcam via a micro, but I have found projects that use a parallel interfaced image sensor. You meant 72 MHz, right?
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