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still image stitched from video?

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  still image stitched from video? Eli the Bearded <*@eli.users.panix.com> - 2014-12-30 00:45 +0000
    Re: still image stitched from video? Jack Strangio  <jackstrangio@yahoo.com> - 2014-12-31 02:18 +0000
      Re: still image stitched from video? Eli the Bearded <*@eli.users.panix.com> - 2014-12-31 21:57 +0000
        Re: still image stitched from video? Jack Strangio  <jackstrangio@yahoo.com> - 2015-01-01 03:23 +0000
          Re: still image stitched from video? Eli the Bearded <*@eli.users.panix.com> - 2015-01-02 22:58 +0000
            Re: still image stitched from video? Jack Strangio  <jackstrangio@yahoo.com> - 2015-01-04 00:58 +0000

#13129 — still image stitched from video?

Let's say you have a clip of video that pans over a landscape. What
would be the easiest way to make a "photo" that consists of the stitched
frames? 

Is this something Hugin can do? I've had very poor results with Hugin
in the past, but haven't tried it in a couple of years. The image links
from this don't work, but the problem is described:

https://www.flickr.com/groups/hugin/discuss/72157630021562085/

I never got that mosaic to work. The photos were of the chess mural on
Plum St, in San Francisco. A street view link that may or may not work:

https://www.google.com/maps/@37.7709283,-122.4183732,3a,75y,180.35h,83.64t/data=!3m4!1e1!3m2!1sJDALROS8-kvrJWPa-qN9fQ!2e0

Elijah
------
has some Yosemite video in mind for this new image stitch project

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#13137

Eli the Bearded <*@eli.users.panix.com> writes:
> Let's say you have a clip of video that pans over a landscape. What
> would be the easiest way to make a "photo" that consists of the stitched
> frames? 
> 
You should be able to extract the frames with something like

     mplayer -vo jpeg <video filename>

then select every 10th (or whatever) frame, and stitch those together.


    convert *.jpg file.pdf

or something similar.

Jack
-- 
"I'm a home-loving girl. And that's where I wish I was."
"At home ..."
"Loving."
               - Laugh-In, 1968

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#13144

In comp.os.linux.misc, Jack Strangio  <jackstrangio@yahoo.com> wrote:
> Eli the Bearded <*@eli.users.panix.com> writes:
>> Let's say you have a clip of video that pans over a landscape. What
>> would be the easiest way to make a "photo" that consists of the stitched
>> frames? 
> You should be able to extract the frames with something like
>      mplayer -vo jpeg <video filename>

Yeah, I'm intimately familiar with how to use mplayer for that purpose.
Generally my command line is closer to:

   mplayer -ss TIME -endpos TIME -nosound -vo jpeg:outdir=DIRECTORY VIDEO


> then select every 10th (or whatever) frame, and stitch those together.
>     convert *.jpg file.pdf

That's not "stitch"ing. That creates a PDF file with one image per page.
Stitching actually combines multiple images into a single unified image.

When I extract JPEGs out of the video files my camera produces, all of
the lens metadata is lost. 

   $ exiftool /mnt/dcim/860_1226/mvi_8788.mov
   [194 lines of output including :]
   Aperture Value                  : 9.0
   Focal Length                    : 11.2 mm
   Lens                            : 5.0 - 25.0 mm
   Lens ID                         : Unknown 5-25mm
   Rotation                        : 0
   Video Frame Rate                : 29.97

   $ mplayer -endpos 5 -vo jpeg:outdir=/tmp/demo
   $ exiftool /tmp/demo/00000100.jpg
   [ 23 lines output with no lens/focal/aperture info ]

From experience, I know that stitching programs *really* want lens and
focal length to do the math to correct for distortion between frames.
That's a big reason why I'd like like to be able to use video files
directly.

That video includes both underwater and above water segments would would 
provide further stitching problems, since the index of refraction
changes mid-way. But, hey, I'd like to see what a program could do
with it.

Elijah
------
loves his waterproof "rugged" camera

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#13151

Eli the Bearded <*@eli.users.panix.com> writes:
> In comp.os.linux.misc, Jack Strangio  <jackstrangio@yahoo.com> wrote:
> > Eli the Bearded <*@eli.users.panix.com> writes:
> >> Let's say you have a clip of video that pans over a landscape. What
> >> would be the easiest way to make a "photo" that consists of the stitched
> >> frames? 
> > You should be able to extract the frames with something like
> >      mplayer -vo jpeg <video filename>
> 
> Yeah, I'm intimately familiar with how to use mplayer for that purpose.
> Generally my command line is closer to:
> 
>    mplayer -ss TIME -endpos TIME -nosound -vo jpeg:outdir=DIRECTORY VIDEO
> 
> 
> > then select every 10th (or whatever) frame, and stitch those together.
> >     convert *.jpg file.pdf
> 
> That's not "stitch"ing. That creates a PDF file with one image per page.
> Stitching actually combines multiple images into a single unified image.
> 
> When I extract JPEGs out of the video files my camera produces, all of
> the lens metadata is lost. 

Very true. I was being lazy with my memory. hugin would do a better job
and it allows some parameters to be played with.

http://hugin.sourceforge.net/tutorials/index.shtml

hugin should be available by selecting it in your package-manager.

Jack
-- 
"I'm a home-loving girl. And that's where I wish I was."
"At home ..."
"Loving."
               - Laugh-In, 1968

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#13186

In comp.os.linux.misc, Jack Strangio  <jackstrangio@yahoo.com> wrote:
> Eli the Bearded <*@eli.users.panix.com> writes:
> > When I extract JPEGs out of the video files my camera produces, all of
> > the lens metadata is lost. 
> Very true. I was being lazy with my memory. hugin would do a better job
> and it allows some parameters to be played with.

Does Hugin do this from video?

> http://hugin.sourceforge.net/tutorials/index.shtml

A quick search of the documentation does not answer the question.

Elijah
------
the hugin release notes are also pretty terse

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#13200

Eli the Bearded <*@eli.users.panix.com> writes:
> In comp.os.linux.misc, Jack Strangio  <jackstrangio@yahoo.com> wrote:
> > and it allows some parameters to be played with.
> 
> Does Hugin do this from video?
> 
That's more sophisticated than my level of expertise. Does this help?

http://hugin.sourceforge.net/docs/manual/Lens_correction_model.html

Regards,

Jack
-- 
"I'm a home-loving girl. And that's where I wish I was."
"At home ..."
"Loving."
               - Laugh-In, 1968

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