Brightness and Whitebalance issue

[Edward2k]

There is a clear issue when the camera sees rapid brightness changes. The AutoWhiteBalance (awb) and AutoExposureControl (aec) gets too far off an acceptable value that the segmentation, in its current form, fails.

[Edward2k]

I am the bearer of bad news and good news. I propose the following :

1. Use the detached VSYNC signal from the ov5645 sensor to flash a (set of) bright LED's.
2. This VSYNC signal can be handle by gstreamer to issue a callback. We must define a simple callback to turn on/off the LED's.

This solves the high power issue of constant LED lighting. It does, however, require fine soldering for the Coral Camera... Should be fine. Also, if the LED's are bright enough, there should be no need to set awb or aec to manual values as they do a good job at minimal variation.

To complete this we must :

• Find LED's that can run off our 7.4V LiPo.
• Find what color the ov5645 is most sensitive too for better efficiency
• Connect the VSYNC signal to the CSI bus
• Attach a callback for start_of_frame and end_of_frame in gstreamer to turn on/off the LED's. NB these are pseudo values.
• Build and wire the LED's and their respective mounts

I propose that solutions to any of the above are marked as complete and explanations are added as comments to this thread.

[Edward2k]

This is closely related to #8. Fixing that may prevent AWB from kicking in.