David, I have many video files, but only want to process them one at a
time. The format is unique, but simple. Basically, 640x480 b/w bmp
images one right after the other. The program should read one image,
then allow the user to produce a histogram of the image displayed. Now
he moves to the next one of interest, and does the same. I started down
this path some months ago, but got side tracked. I did make some
progress, so I think I'll review that, and just see if I can finish it
off. I would think it really isn't a complicated program. In fact, I
would think such a common need, without the histograms, that it should
be available as a possible example of how to read simple video files.
I'll stick to Win Python. I've used C and Linux before, but don't see a
need to go back to it here.
David Kirtley wrote:
Well, I really had intended it to be a guide and unless you have the
gnuplot python stuff also, it would not run directly.
What exactly are you trying to do? From what I understood, you have a
bunch of image files and want to do histograms for each of them.
(Unless you are trying to do them from video which is problematic. I
personally saved the video I was working as a set of individual image
files. Getting them from a video stream is a lot harder and has many
difficulties- many man-made because of licensing and patents on video
compression. I have not done it directly and would not want to mess
with it. It is really nasty.)
Also, that code is pretty old (I think 2.2 or maybe even older Python)
the new glob stuff
files = glob.glob(os.path.join('','*.out'))
will make it easy to get a list of the files in the directory.
So the basic strategy would be :
Get the list of files to process with the glob -- Who chooses these names? ;)
(Not perfect code, just rough idea.....)
for file in file_list:
image = Image.open(file)
histogram = Image.chops.histogram -- don't remember where the
histogram stuff is off the top of my head
make the comparison
save the results
If you are going to be doing some in depth analysis of the data, you
prob will want to use Numpy and deal with them as arrays.
On Wed, Nov 25, 2009 at 9:44 AM, Wayne Watson
<sierra_mtnv...@sbcglobal.net> wrote:
I thought I'd try executing your code under Win Python, but it objected to
indentation, tabs. I tried substituting 4 blanks for them, but that didn't
work out. Suggestions?
David Kirtley wrote:
http://www.cs.panam.edu/~dkirtley/video/
Should not need too much modification for what you want to do.
David Kirtley
On Tue, Nov 24, 2009 at 7:59 PM, Wayne Watson
<sierra_mtnv...@sbcglobal.net> wrote:
A few hours ago someone posted some sample Python code somewhere in
several
of the python lists pictures. I looked at it and thought that looks
pretty
interesting. Now I can't find it. Does anyone know of that post? Typical
I
use Image-SIG, Pmw-Toolkit Python Tutor, Tkinter, VisPython lists but I
don't see it.
My interest is that I would like to step through a video file of b/w
images,
640x480, and stop along the way to make histograms to determine noise
characteristics of the camera that took the video.
--
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
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_______________________________________________
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--
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
350 350 350 350 350 350 350 350 350 350
Make the number famous. See 350.org
The major event has passed, but keep the number alive.
Web Page: <www.speckledwithstars.net/>
_______________________________________________
Image-SIG maillist - Image-SIG@python.org
http://mail.python.org/mailman/listinfo/image-sig
--
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
350 350 350 350 350 350 350 350 350 350
Make the number famous. See 350.org
The major event has passed, but keep the number alive.
Web Page: <www.speckledwithstars.net/>
_______________________________________________
Image-SIG maillist - Image-SIG@python.org
http://mail.python.org/mailman/listinfo/image-sig
