Sync shutter and LEDs

[lahiiru]

Shutter and Red, Blue LEDs needs to be operated in certain time intervals. Otherwise, we get partially exposed or single color exposed images. We are now going to use webcam, not RPi camera.

Currently, LEDs are driven by separate processor (Arduino) from the processor (RPi) where images are captured. There is another way to try. We can use same RPi to drive LEDs. But I don't think it will be a great idea since we can't figure out when exactly the webcam is going to start reading pixel rows.

To solve the problem, first need to have good idea about electronic shutter. Although LEDs are not synced, there is another option to see what is capturing and analyse frames and figure out what are the frames to be discarded and what are the frames to used. OR using patterns in frames we can adjust LED timing.