I can update it, but I think it makes more sense for you to have it on
your website. Just running "make" with that makefile should do it,
after you point it to the Pd and Gem sources.
.hc
On May 14, 2010, at 8:50 PM, William Brent wrote:
I've updated the helpfile and source for pix_motion_sector. It now
compares pixels using RGB vectors instead of just grayscale. Husk -
if you're planning to use it, definitely update to this version:
http://williambrent.conflations.com/pages/research.html#pix_motion_sector
Hans, would you mind updating the version you're hosting as well?
On Fri, May 14, 2010 at 9:27 AM, William Brent <[email protected]
> wrote:
I'll update the helpfile for [pix_motion_sector] to include a
subpatch
that does the same thing with [pix_crop], [pix_movement], and
[pix_dump]. I think I might also change the source and try taking
the
distance between current/previous frames using all RGB info instead
of
a greyscale approximation. The speed issue aside, that may be a
significant difference from [pix_movement] worth investigating.
On Fri, May 14, 2010 at 8:43 AM, Hans-Christoph Steiner <[email protected]
> wrote:
I'd love to see an example implementation of this as a patch, if
anyone is
up for it. A lot of students ask me for this kind of video
tracking. It
would be good to add to the video tracking examples.
.hc
On May 14, 2010, at 10:11 AM, Jack wrote:
Le vendredi 14 mai 2010 à 06:49 -0700, William Brent a écrit :
I implemented Miller's phase vocoder from the documentation in C
and
was amazed to see that the CPU load was exactly the same. So
much for
improving efficiency... But I have seen a big difference for
traversing tables and lists. The process of summing the
elements in a
large table is much faster in an extern than with an [until] loop.
In the case of [pix_motion_sector], what's the easiest way to
duplicate the functionality of reporting % of pixels changed in
the
region? Is there an obvious way to count up the number of
pixels that
crossed [pix_movement]'s threshold in the cropped region?
[pix_dump] ? Maybe a faster method ?
++
Jack
2010/5/14 IOhannes m zmölnig <[email protected]>:
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Jaime Oliver wrote:
On Thu, May 13, 2010 at 7:40 PM, Mathieu Bouchard
<[email protected]>wrote:
On Thu, 13 May 2010, William Brent wrote:
Yes - it's exactly that: an adaptation of pix_movement that
lets you
specify an area to analyze. That way you can use several
instances
to
create multiple regions for triggering different events. I
haven't
looked
at this in two years! I'll take a look at the helpfile and
see
what's
missing/unclear.
what's the difference between that, and using [pix_crop] and
[pix_movement]
with [pix_separator] ?
Please correct me if I'm wrong,
Doesn't having these as externals instead of abstractions,
make it
significantly faster/efficient?
particularly if you have many of them?
no not necessarily.
the overhead for message communication between objects is
usually quite
small, compared to the pixel operations.
you would only need [pix_crop]->[pix_movement] without the
[pix_separator] (since the crop will have to allocate a new image
anyhow), thus no need for the extra copying of data.
the only speedup you could expect from pix_motion_sector (i
haven't
looked at the code), is that you wouldn't have to copy the data
for
cropping at all, but only use the pixels in the ROI.
as for williams argument, that you need less objects, i would
suggest
looking into abstractions :-) it's definitely less lines of
code (at a
minimum 10 lines of Pd code) and still only a single object...
mfgasdr
IOhannes
best,
J
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"We have nothing to fear from love and commitment." - New York
Senator Diane
Savino, trying to convince the NY Senate to pass a gay marriage bill
--
William Brent
www.williambrent.com
“Great minds flock together”
Conflations: conversational idiom for the 21st century
www.conflations.com
--
William Brent
www.williambrent.com
“Great minds flock together”
Conflations: conversational idiom for the 21st century
www.conflations.com
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Looking at things from a more basic level, you can come up with a more
direct solution... It may sound small in theory, but it in practice,
it can change entire economies. - Amy Smith
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