[FFmpeg-user] Generating a displacement map

Paul B Mahol onemda at gmail.com
Wed Jul 5 20:03:15 EEST 2017

On 7/5/17, Moritz Barsnick <barsnick at gmx.net> wrote:
> Hi Evert,
> On Wed, Jul 05, 2017 at 13:31:15 +0200, Evert Vorster wrote:
>> Using ffmpeg, hugin, and some scripting, each image is un-distorted
>> according to it's lens characteristics, and stitched together to make an
>> equirectangular frame.
> [...]
>> Rather than figure out the location of each pixel every time, it would be
>> much more efficient to just use a displacement map and move the pixels.
> Do have a look at the "displace" filter. The examples show how to
> describe the displacement with an equation/formula:

remap filter is better option.

> https://ffmpeg.org/ffmpeg-filters.html#displace
>> Actually generating such a map might be a bit of a trick.
>> Is there any ideas from the community on how to generate and use such a
>> map?
> If you can describe it mathematically, you may be able to use ffmpeg's
> expression system for the formula. Otherwise you would create two
> "images" which contain this displacement data, and feed them as looped
> inputs. The actual description of the map is probably up to you (and
> hugin or the lens database).
> Cheers,
> Moritz
>> Isometrix Acquistion Superchief
> Lovely title you have there. :-D
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