[FFmpeg-user] Does v360 filter support dewarping circular fisheye images?

[Paul B Mahol]

On Thu, Dec 24, 2020 at 12:25 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> Am 24.12.2020 um 10:42 schrieb thongtm2:
> > I have a fisheye camera (360 degrees in horizontal & 180 degrees in
> > vertical). Is it possible to use v360 filter to dewarp circular fisheye
> > images to single perspective images (flatten fisheye images)? I've tried
> > many options but the results were not as I expected. Below command is
> one of
> > them:
> >   ffplay fisheye_video.mp4 -vf
> > v360=fisheye:ih_fov=360:iv_fov=180:flat:yaw=120:pitch=0:roll=0
>
> There are several problems in your command line.
> 1. As Paul has already pointed out, ih_fov and iv_fov must have the same
> value for fisheye input. In your case both must be 180.
> 2. It also makes sense to specify the output field of view h_fov and
> v_fov and the output size w and h, because the default values aren't
> known (unless you look in the source code).
> 3. The command line is better readable if you don't omit the names of
> the options. I mean "output=flat". The names can be omitted if the
> options are specified exactly in the correct order. Your command line
> may work as it is, but it would be better if "flat" or "output=flat" is
> the second option.
>
> This should work:
>
> v360=input=fisheye:output=flat:ih_fov=180:iv_fov=180:h_fov=90:v_fov=60:w=900:h=600:pitch=-60
>
>
I may be mistaken, but OP input looks to be 360 fisheye, I havent actually
tried.


> Michael
>
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