I have being playing more with low-light situations, though (i.e. out of a town) so the requirements are abit different. See some discussion here: Night-time HDR with image stackingThe process is described here: Francesco Bonomi - Night-time HDR with image stacking
I love scripting, but in this case my opinion is: a script is just something that automates a process on your camera.As long as you don't have the process very clear in your mind, setting things manually (with the help of CHDK) can sometimes help you as it gives you more flexibility.
I would suggest to do some tests, settings those parameters in CHDK and seeing the results.
As for the non-motion detect part, I am pretty sure it was discussed somewhere on the forum, but can't find the thread.... Also, a non-motion detect for long exposure would be rather useless, as it woud start shooting at time X, when there are no cars, but there is a high probability that at time X+5 seconds a car comes in the field.
The nothing is cheap and widespread, but it's hard to get something out if it.IP rendering does nothing with the nothing. It brings the way to merge several pictures in one.To my experience with Canon compact cameras, 250 shots made in 'special iso3200 mode' on 970IS can be merged in single picture, which would be completelly noise/artefact-free and also sharper then the picture shot at iso80. Even more, it can look better then IP-rendered sequence of 3-5 iso80 shots.It took about a week on my old 2.4GHz athlon x2 with 2GB of RAM and 8GB of swap. I'm sure, with better CPU and more RAM results could be better - i was forced to use lowest quality settings.
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