Fix auto-exposure and AWB

Richard Bowmanrequested to merge
auto-exposure-gain-awb into master

The previous "auto calibrate" button for the camera relied on a combination of the built-in autoexposure/AWB and some JPEG-based tweaks to get the exposure settings right. This often led to confusing results, e.g. oscillating between green and pink images.

  • I have rewritten the auto-exposure code to adjust gain and shutter speed based on the raw image. This seems to be very reliable, at the expense of being quite slow. That's a price I'm happy to pay.

  • I have replaced both the camera's auto white balance and my JPEG-based AWB hack with a single-shot AWB method that looks at the raw image.

This works as-is with the existing interface, but I'd like to improve the calibration interface while I'm at it.

Fixes #191 (closed)

Edited by Richard Bowman

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