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echo: rberrypi
to: SEAN
from: DAVE LIQUORICE
date: 2017-02-03 20:16:00
subject: Re: Time lapse using rasp

On Fri, 3 Feb 2017 08:07:53 -0000 (UTC), sean wrote:

> I see the pictures are all in focus ...

A Pi camera has a tiny aperture, it's almost a pin hole camera so
depth of field is from about a few feet to infinity.

> and did pretty well with the white balance, although that's probably
> because you're inside a well lit area. Any experience outside?

I had one showing an outside scene and time lapsed that. The white
balance set to auto worked very well.

> Once you have all the images, you load them up on your machine and use
> what to put the time lapse together?

Imaging taking uses python picamera module. For processing of stills,
adding date/time etc, "convert" from imagemagick and python-pil to
analyse the image to determine if it's dark or not (timelapse of
black stills is a bit boring) and to render the stills into a time
lapse movie mencoder.

> Any concerns of SD card wear? Again, SD cards are cheap and that
> possibility could happen with gopros as well.

My Pi time lapse would kill a card or USB stick in about 6 weeks. But
all image processing was being done on the Pi. A full HD still every
30 seconds (1920 x 1080, 1.5 MB ish, 2,880 times/day), checked to see
if it's dark, if not add date/time, averge of another 1440 writes. So
something of the order of 4 to 5,000 writes/pay. 8 GB card could hold
about 20 days of still images and 8 timelapses on a FIFO basis.

--
Cheers
Dave.

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