Camera auto-exposure configuration

[hmlow]

Hi devs

I noticed that voxl-camera-server.conf went thru some changes recently (since platform release 0.7 i think).

Would you guys be able to explain what some of these parameters do?

		"ae_desired_msv":	60,
		"ae_filter_alpha":	0.600000023841858,
		"ae_ignore_fraction":	0.20000000298023224,
		"ae_slope":	0.05000000074505806,
		"ae_exposure_period":	1,
		"ae_gain_period":	1

Thanks!