In a vain attempt to regain control of this blog, my instagram cross-posts have moved from here to zimpenfishtagram.posterous.com.
Thanks to Posterous for their posterous gem which made this a very simple task.Trying to shamelessly copy @lipsticklori's idea of a twitter-free week and being scared at how embedded Twitter is in my life:
I'll still be sending my Instagrams to @zimpenfish_p which is possibly cheating but I can live with that.
I've been running a webcam pointing at the sky to generate pictures and timelapse movies of clouds for a few months now. After a daft conversation on the Jabbers, I thought it would be interesting to see if some image processing trickery could be used to automatically spot contrails.
The answer appears to be "Yes ... but."
Using the LSD algorithm (entirely through their sample code, thank you) to detect line segments and some Perl to look for "pairs of lines which are close together, going the same way, mostly parallel, and a reasonable length", I have alpha 1 of "Contrail Spotter".


Unfortunately the false positive rate is too high. Rain and clouds easily confuse the algorithm. Tweaks will be made. More on that later.

