Re: Removing fisheye distortion

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On Thu, 2021-08-12 at 17:57 +0930, Tim via users wrote:
> On Wed, 2021-08-11 at 13:09 +0100, Patrick O'Callaghan wrote:
> > My USB camera, which is used only for online video chats, has quite
> > marked fisheye distortion. Although this could be regarded as a
> > feature in some contexts, for me it's just a distraction. Is there
> > a
> > way of removing this in real time? I mostly use Zoom, but if
> > possible
> > I'd like to tweak the video somewhere between the driver and the
> > application, in other words create a "virtual camera" that works
> > the
> > way I want, perhaps analogous to how audio pipelines work in Linux.
> 
> Probably the easiest approach is get a better camera, but that's not
> always desirable.  I got a real cheapie, and it doesn't have that
> problem.

I've already been through several cameras but this is the first one
with acceptable sound. It's only for occasional use so I'm not that
keen on spending a lot. In fact I saw an article recently on webcams
which concluded that there are no good ones ...

> Basically, the problem is a tiny image sensor needs a super wide-
> angle
> lens to get a wide-enough image on a tiny sensor.  You either
> increase
> the sensor size, or built a better lens.
> 
> I notice people offering a software filter to add reverse distortion
> to
> the image in obs-studio, it's possible the same algorithms might work
> in other software.  One of them tweaked a sharpness filter that came
> with the program, so you didn't have to figure out how to add an
> extra
> filter.
> 
> It's damn hard to search for answers for a program called zoom,
> seeing
> as it uses the same name as a zoom lens.  I wish programs wouldn't
> pick
> such generic, and inappropriate names.  There's nothing zoomy about a
> chat program.

Yep.

poc
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