[CentralOH] focus for numpy/scipy presentations

[Eric Floehr]

Neil,

I have two image sets available. The first is my entire first version of my
timelapse, which was a shot every minute from a 640x480 webcam. It is 9.1GB
compressed and is available here:

https://dl.dropboxusercontent.com/u/322193/pyohio2012/talk/webcam_pictures.tgz

I also have a single day available that contains a lot of bird images. Here
is an image I made by stacking and taking the darkest value of each pixel
for the day, then doing some white balancing:

https://twitter.com/ForecastWatch/status/568131899929051136

Here is the archive of pictures for that day, which is about 2.1GB
compressed:

https://www.dropbox.com/s/m4ggawa25bfqq2q/day_2014_12_19.tgz?dl=0

Will this work for you?

Thanks!
Eric




On Mon, May 2, 2016 at 1:08 PM, Neil Ludban <nludban at columbus.rr.com> wrote:

> Eric,
>
> I think this would make a good intro presentation:
> - Load an image from a file into a numpy matrix
> - Display a matrix as an image
> - Basic matrix operations (select a region of interest, convert to
> grayscale)
> - Convolution (smoothing and edge detection filters)
> - Correlation (finding motion between successive images)
>
> As others have pointed out, OpenCV already does this, but for these
> functions it's really just an optimized implementation of simple
> equations (actually, variations on one equation).  You can still
> benefit from using numpy to prepare the inputs and to reduce the
> outputs.  Machine learning on megapixels of input is computationally
> expensive, it is common to preprocess the image in order to reduce
> the amount of time needed.
>
> Are your timelapse images available online, or could you post a small
> number of representative images for me to experiment with?
>
>
> On Sun, 1 May 2016 11:02:20 -0400
> Eric Floehr <eric at intellovations.com> wrote:
> > Neil,
> >
> > I am interested in numpy and scipy for image manipulation and analysis
> and
> > would be interested in getting started with feature detection and image
> > classification.
> >
> > Specifically for my timelapse project, I would like to identify features
> > like birds, the moon, airplane lights, and of course clouds. I would also
> > be interested in grouping sky images into groups automatically. You know
> > that there is blue sky and completely overcast, but there are probably
> > certain other types of sky and cloud cover that naturally group together
> > and it would be neat to be able to identify those clusters.
> >
> > Don't know if any of that is possible, but that's my thoughts :-).
> >
> > Thanks!
> > Eric
> >
> >
> >
> > On Sat, Apr 30, 2016 at 6:27 PM, Neil Ludban <nludban at columbus.rr.com>
> > wrote:
> >
> > > At the last cohpy meeting, several people wrote down numpy and/or scipy
> > > as desired topics for future presentations.  These are very broad and
> > > easily turn into boring overviews of python for matlab people.  Does
> > > anyone have requests for a presentation on a specific scipy module,
> > > digital signal processing topic, or even an idea for a project that you
> > > heard numpy/scipy would be good for but not sure how to get started?
> > > _______________________________________________
> > > CentralOH mailing list
> > > CentralOH at python.org
> > > https://mail.python.org/mailman/listinfo/centraloh
> > >
>
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