V360 filter

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V360 filter

Michael Koch
Hi all,

I see the progress on the V360 filter... that's very good!
A few suggestions for improvement:
-- (Single-)Fisheye as input and output format, with a selectable field
of view up to 360° (little planet).
-- A "color" option for filling those areas that have got no data from
the input.
-- I think the d_flip parameter needs some more documentation. What's an
"in-depth" flip?

Michael
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Re: V360 filter

Michael Koch
Am 06.09.2019 um 15:14 schrieb Michael Koch:

> Hi all,
>
> I see the progress on the V360 filter... that's very good!
> A few suggestions for improvement:
> -- (Single-)Fisheye as input and output format, with a selectable
> field of view up to 360° (little planet).
> -- A "color" option for filling those areas that have got no data from
> the input.
> -- I think the d_flip parameter needs some more documentation. What's
> an "in-depth" flip?

Workaround for converting a quadratic single-fisheye video (camera
pointing to the sky) to an equirectangular video:

ffmpeg -i in.mp4 -lavfi
"pad=w=2*iw:color=darkgreen,v360=input=dfisheye:output=e:pitch=90" -y
out.mp4

Michael

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Re: V360 filter

Paul B Mahol
In reply to this post by Michael Koch
On 9/6/19, Michael Koch <[hidden email]> wrote:
> Hi all,
>
> I see the progress on the V360 filter... that's very good!
> A few suggestions for improvement:
> -- (Single-)Fisheye as input and output format, with a selectable field
> of view up to 360° (little planet).

Stereographic projection aka little planet added as both input and output.
Single fisheye is little different.

> -- A "color" option for filling those areas that have got no data from
> the input.
> -- I think the d_flip parameter needs some more documentation. What's an
> "in-depth" flip?

It swaps back with front.

>
> Michael
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Re: V360 filter

Michael Koch
Paul,

> Stereographic projection aka little planet added as both input and output.
> Single fisheye is little different.

v_fov is limited to 90°, that's not enough for little planet.

>
>> -- I think the d_flip parameter needs some more documentation. What's an
>> "in-depth" flip?
> It swaps back with front.

Please add it to the documentation, "in-depth" flip isn't self-explaining.


I have a workaround for converting an equirectangular video to a little
planet video, but I use a fisheye projection (vertical coordinate in
equirectangular image is proportional to distance from image center in
little planet image):

set "IN=test3.mp4"          :: Equirectangular input video
set "H=960"               :: Height of input video (width = 2 * height)
set "S=1080"                :: Size of quadratic little planet output video
set "OUT=out.mp4"           :: Output video

rem Create the xmap file
ffmpeg -f lavfi -i nullsrc=size=%S%x%S% -vf format=pix_fmts=gray16le,^
geq='%H%*(0.9999+atan2(Y-%S%/2,X-%S%/2)/PI)' -frames 1 -y xmap.pgm

rem Create the ymap file
ffmpeg -f lavfi -i nullsrc=size=%S%x%S% -vf format=pix_fmts=gray16le,^
geq='%H%*(1-hypot((2*X/%S%)-1,(2*Y/%S%)-1))' -frames 1 -y ymap.pgm

rem Apply the remap filter to the video
ffmpeg -i %IN% -i xmap.pgm -i ymap.pgm -lavfi
"format=pix_fmts=rgb24,remap" -y %OUT%


Michael

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Re: V360 filter

Paul B Mahol
On 9/10/19, Michael Koch <[hidden email]> wrote:
> Paul,
>
>> Stereographic projection aka little planet added as both input and output.
>> Single fisheye is little different.
>
> v_fov is limited to 90°, that's not enough for little planet.

I increased it.

>
>>
>>> -- I think the d_flip parameter needs some more documentation. What's an
>>> "in-depth" flip?
>> It swaps back with front.
>
> Please add it to the documentation, "in-depth" flip isn't self-explaining.
>
>
> I have a workaround for converting an equirectangular video to a little
> planet video, but I use a fisheye projection (vertical coordinate in
> equirectangular image is proportional to distance from image center in
> little planet image):
>
> set "IN=test3.mp4"          :: Equirectangular input video
> set "H=960"               :: Height of input video (width = 2 * height)
> set "S=1080"                :: Size of quadratic little planet output video
> set "OUT=out.mp4"           :: Output video
>
> rem Create the xmap file
> ffmpeg -f lavfi -i nullsrc=size=%S%x%S% -vf format=pix_fmts=gray16le,^
> geq='%H%*(0.9999+atan2(Y-%S%/2,X-%S%/2)/PI)' -frames 1 -y xmap.pgm
>
> rem Create the ymap file
> ffmpeg -f lavfi -i nullsrc=size=%S%x%S% -vf format=pix_fmts=gray16le,^
> geq='%H%*(1-hypot((2*X/%S%)-1,(2*Y/%S%)-1))' -frames 1 -y ymap.pgm
>
> rem Apply the remap filter to the video
> ffmpeg -i %IN% -i xmap.pgm -i ymap.pgm -lavfi
> "format=pix_fmts=rgb24,remap" -y %OUT%
>

You sure that is little planet projection?

It is not, it is 360 deg fisheye.

>
> Michael
>
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Re: V360 filter

Michael Koch
Paul,

>
>> v_fov is limited to 90°, that's not enough for little planet.
> I increased it.

ok, I will test it as soon as it's available at Zeranoe.

I think the field of view isn't correct in the stereographic output.

Here is a script for making really nice test images, for measuring field
of view:


set "IN=1200.png"                   :: Test pattern from
http://www.paulbourke.net/dome/testpattern/1200.png
set "OUT=double_fisheye_test.png"   :: Double fisheye test image

ffmpeg -i %IN% -i %IN% -lavfi
"[0]transpose=1[left];[1]transpose=2,geq=r='255-r(X,Y)':g='255-g(X,Y)':b='255-b(X,Y)'[right];[left][right]hstack"
-y %OUT%

set "IN=double_fisheye_test.png"
set "OUT=equirectangular_test.png"  :: Equirectangular test image

ffmpeg -i %IN% -lavfi "v360=input=dfisheye:output=e:pitch=90" -y %OUT%

Michael
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Re: V360 filter

Paul B Mahol
On 9/10/19, Michael Koch <[hidden email]> wrote:

> Paul,
>
>>
>>> v_fov is limited to 90°, that's not enough for little planet.
>> I increased it.
>
> ok, I will test it as soon as it's available at Zeranoe.
>
> I think the field of view isn't correct in the stereographic output.
>
> Here is a script for making really nice test images, for measuring field
> of view:
>
>
> set "IN=1200.png"                   :: Test pattern from
> http://www.paulbourke.net/dome/testpattern/1200.png
> set "OUT=double_fisheye_test.png"   :: Double fisheye test image
>
> ffmpeg -i %IN% -i %IN% -lavfi
> "[0]transpose=1[left];[1]transpose=2,geq=r='255-r(X,Y)':g='255-g(X,Y)':b='255-b(X,Y)'[right];[left][right]hstack"
> -y %OUT%

Cant you use here negate filter instead of geq?

>
> set "IN=double_fisheye_test.png"
> set "OUT=equirectangular_test.png"  :: Equirectangular test image
>
> ffmpeg -i %IN% -lavfi "v360=input=dfisheye:output=e:pitch=90" -y %OUT%
>
> Michael
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>
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Re: V360 filter

Michael Koch

>> ffmpeg -i %IN% -i %IN% -lavfi
>> "[0]transpose=1[left];[1]transpose=2,geq=r='255-r(X,Y)':g='255-g(X,Y)':b='255-b(X,Y)'[right];[left][right]hstack"
>> -y %OUT%
> Cant you use here negate filter instead of geq?

oops, yes that would be better. I did search for "invert" and didn't
find it...

Michael
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Re: V360 filter

Paul B Mahol
In reply to this post by Michael Koch
On 9/10/19, Michael Koch <[hidden email]> wrote:

> Paul,
>
>>
>>> v_fov is limited to 90°, that's not enough for little planet.
>> I increased it.
>
> ok, I will test it as soon as it's available at Zeranoe.
>
> I think the field of view isn't correct in the stereographic output.
>
> Here is a script for making really nice test images, for measuring field
> of view:

Well spotted, thanks, should be fixed.

>
>
> set "IN=1200.png"                   :: Test pattern from
> http://www.paulbourke.net/dome/testpattern/1200.png
> set "OUT=double_fisheye_test.png"   :: Double fisheye test image
>
> ffmpeg -i %IN% -i %IN% -lavfi
> "[0]transpose=1[left];[1]transpose=2,geq=r='255-r(X,Y)':g='255-g(X,Y)':b='255-b(X,Y)'[right];[left][right]hstack"
> -y %OUT%
>
> set "IN=double_fisheye_test.png"
> set "OUT=equirectangular_test.png"  :: Equirectangular test image
>
> ffmpeg -i %IN% -lavfi "v360=input=dfisheye:output=e:pitch=90" -y %OUT%
>
> Michael
> _______________________________________________
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> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
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Re: V360 filter

Michael Koch
Paul,

>> I think the field of view isn't correct in the stereographic output.
>>
>> Here is a script for making really nice test images, for measuring field
>> of view:
> Well spotted, thanks, should be fixed.

The field of view of the stereographic output isn't correct. Here are a
few examples:
set in command line / measured in output image
60° / 74°
120° / 135°
180° / 180°
240° / 212°
300° / 236°
360° / 274°

Vertical field of view is limited to 180°, which makes "little planet"
impossible..

Michael

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Re: V360 filter

Michael Koch
Am 11.09.2019 um 13:13 schrieb Michael Koch:

> Paul,
>
>>> I think the field of view isn't correct in the stereographic output.
>>>
>>> Here is a script for making really nice test images, for measuring
>>> field
>>> of view:
>> Well spotted, thanks, should be fixed.
>
> The field of view of the stereographic output isn't correct. Here are
> a few examples:
> set in command line / measured in output image
> 60° / 74°
> 120° / 135°
> 180° / 180°
> 240° / 212°
> 300° / 236°
> 360° / 274°

Make this correction:

new_fov = 180 * tan(fov/4)

where fov the the field of view you get from the command line, and
fov_new is the value that you use for the filter.
You must exclude values too close to 360°, because 360° stereographic
projection is impossible.

Michael

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Re: V360 filter

Michael Koch
Am 11.09.2019 um 14:23 schrieb Michael Koch:

> Am 11.09.2019 um 13:13 schrieb Michael Koch:
>> Paul,
>>
>>>> I think the field of view isn't correct in the stereographic output.
>>>>
>>>> Here is a script for making really nice test images, for measuring
>>>> field
>>>> of view:
>>> Well spotted, thanks, should be fixed.
>>
>> The field of view of the stereographic output isn't correct. Here are
>> a few examples:
>> set in command line / measured in output image
>> 60° / 74°
>> 120° / 135°
>> 180° / 180°
>> 240° / 212°
>> 300° / 236°
>> 360° / 274°
>
> Make this correction:
>
> new_fov = 180 * tan(fov/4)
>
> where fov the the field of view you get from the command line, and
> fov_new is the value that you use for the filter.
> You must exclude values too close to 360°, because 360° stereographic
> projection is impossible.
>

P.S. of course fov must be converted to radians before using tan():

new_fov = 180 * tan(fov * pi / 720)

Michael

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Re: V360 filter

Paul B Mahol
On 9/11/19, Michael Koch <[hidden email]> wrote:

> Am 11.09.2019 um 14:23 schrieb Michael Koch:
>> Am 11.09.2019 um 13:13 schrieb Michael Koch:
>>> Paul,
>>>
>>>>> I think the field of view isn't correct in the stereographic output.
>>>>>
>>>>> Here is a script for making really nice test images, for measuring
>>>>> field
>>>>> of view:
>>>> Well spotted, thanks, should be fixed.
>>>
>>> The field of view of the stereographic output isn't correct. Here are
>>> a few examples:
>>> set in command line / measured in output image
>>> 60° / 74°
>>> 120° / 135°
>>> 180° / 180°
>>> 240° / 212°
>>> 300° / 236°
>>> 360° / 274°
>>
>> Make this correction:
>>
>> new_fov = 180 * tan(fov/4)
>>
>> where fov the the field of view you get from the command line, and
>> fov_new is the value that you use for the filter.
>> You must exclude values too close to 360°, because 360° stereographic
>> projection is impossible.
>>
>
> P.S. of course fov must be converted to radians before using tan():
>
> new_fov = 180 * tan(fov * pi / 720)

Thanks, that cleared some stuff.
Should be fixed.

> Michael
>
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Re: V360 filter

Michael Koch
Paul,

>
>>> Make this correction:
>>>
>>> new_fov = 180 * tan(fov/4)
>>>
>>> where fov the the field of view you get from the command line, and
>>> fov_new is the value that you use for the filter.
>>> You must exclude values too close to 360°, because 360° stereographic
>>> projection is impossible.
>>>
>> P.S. of course fov must be converted to radians before using tan():
>>
>> new_fov = 180 * tan(fov * pi / 720)
> Thanks, that cleared some stuff.
> Should be fixed.

Converting from equirectangular to stereographic is working fine now.
Field of view is correct.
But in the other direction from stereographic to equirectangular the
output is wrong.
The output doesn't contain any no-data areas. I mean those areas that
aren't visible in the stereographic input. These areas should be filled
with black (or better a user-defined color).
Also, the default output size should be width/height=2, but it is quadratic.

I tested with these command lines:

ffmpeg -i equirectangular_test.png -lavfi
"v360=input=e:output=sg:h_fov=300:v_fov=300" -y sg.png
ffmpeg -i sg.png -lavfi "v360=input=sg:output=e:h_fov=300:v_fov=300" -y
e.png

Michael
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Re: V360 filter

Paul B Mahol
On 9/12/19, Michael Koch <[hidden email]> wrote:

> Paul,
>
>>
>>>> Make this correction:
>>>>
>>>> new_fov = 180 * tan(fov/4)
>>>>
>>>> where fov the the field of view you get from the command line, and
>>>> fov_new is the value that you use for the filter.
>>>> You must exclude values too close to 360°, because 360° stereographic
>>>> projection is impossible.
>>>>
>>> P.S. of course fov must be converted to radians before using tan():
>>>
>>> new_fov = 180 * tan(fov * pi / 720)
>> Thanks, that cleared some stuff.
>> Should be fixed.
>
> Converting from equirectangular to stereographic is working fine now.
> Field of view is correct.
> But in the other direction from stereographic to equirectangular the
> output is wrong.
> The output doesn't contain any no-data areas. I mean those areas that
> aren't visible in the stereographic input. These areas should be filled
> with black (or better a user-defined color).

That is not doable by design.

> Also, the default output size should be width/height=2, but it is quadratic.

output size for what?

> I tested with these command lines:
>
> ffmpeg -i equirectangular_test.png -lavfi
> "v360=input=e:output=sg:h_fov=300:v_fov=300" -y sg.png
> ffmpeg -i sg.png -lavfi "v360=input=sg:output=e:h_fov=300:v_fov=300" -y
> e.png
>
> Michael
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Re: V360 filter

Michael Koch
Am 12.09.2019 um 14:05 schrieb Paul B Mahol:

> On 9/12/19, Michael Koch <[hidden email]> wrote:
>> Paul,
>>
>>>>> Make this correction:
>>>>>
>>>>> new_fov = 180 * tan(fov/4)
>>>>>
>>>>> where fov the the field of view you get from the command line, and
>>>>> fov_new is the value that you use for the filter.
>>>>> You must exclude values too close to 360°, because 360° stereographic
>>>>> projection is impossible.
>>>>>
>>>> P.S. of course fov must be converted to radians before using tan():
>>>>
>>>> new_fov = 180 * tan(fov * pi / 720)
>>> Thanks, that cleared some stuff.
>>> Should be fixed.
>> Converting from equirectangular to stereographic is working fine now.
>> Field of view is correct.
>> But in the other direction from stereographic to equirectangular the
>> output is wrong.
>> The output doesn't contain any no-data areas. I mean those areas that
>> aren't visible in the stereographic input. These areas should be filled
>> with black (or better a user-defined color).
> That is not doable by design.

What about fisheye input and output?
Fisheye (180°) input is almost the same as already implemented as
dfisheye, and if the second hemisphere doesn't exist it can be replaced
by a color.
Fisheye input and output is important. For example I've made a long-time
timelapse from many fisheye images, but some of the images require a few
degrees tilting. That means the fisheye image must be converted to
equirectangular, tilted, and then converted back to fisheye.

>
>> Also, the default output size should be width/height=2, but it is quadratic.
> output size for what?

The equirectangular output image should have width/height=2 by default.

Question:
If the input format is stereographic and the output format is
equirectangular, what's then the meaning of the h_fov and v_fov parameters?
Do they define the field of view of the stereographic input (that would
make sense),
or do they define the field of view of the equirectangular output (that
makes no sense, because equirectangular should always be 360° x 180°).

Michael

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Re: V360 filter

Paul B Mahol
On 9/12/19, Michael Koch <[hidden email]> wrote:

> Am 12.09.2019 um 14:05 schrieb Paul B Mahol:
>> On 9/12/19, Michael Koch <[hidden email]> wrote:
>>> Paul,
>>>
>>>>>> Make this correction:
>>>>>>
>>>>>> new_fov = 180 * tan(fov/4)
>>>>>>
>>>>>> where fov the the field of view you get from the command line, and
>>>>>> fov_new is the value that you use for the filter.
>>>>>> You must exclude values too close to 360°, because 360° stereographic
>>>>>> projection is impossible.
>>>>>>
>>>>> P.S. of course fov must be converted to radians before using tan():
>>>>>
>>>>> new_fov = 180 * tan(fov * pi / 720)
>>>> Thanks, that cleared some stuff.
>>>> Should be fixed.
>>> Converting from equirectangular to stereographic is working fine now.
>>> Field of view is correct.
>>> But in the other direction from stereographic to equirectangular the
>>> output is wrong.
>>> The output doesn't contain any no-data areas. I mean those areas that
>>> aren't visible in the stereographic input. These areas should be filled
>>> with black (or better a user-defined color).
>> That is not doable by design.
>
> What about fisheye input and output?
> Fisheye (180°) input is almost the same as already implemented as
> dfisheye, and if the second hemisphere doesn't exist it can be replaced
> by a color.
> Fisheye input and output is important. For example I've made a long-time
> timelapse from many fisheye images, but some of the images require a few
> degrees tilting. That means the fisheye image must be converted to
> equirectangular, tilted, and then converted back to fisheye.

I'm working on dual fisheye output....

>
>>
>>> Also, the default output size should be width/height=2, but it is
>>> quadratic.
>> output size for what?
>
> The equirectangular output image should have width/height=2 by default.

Will try to fix it.

>
> Question:
> If the input format is stereographic and the output format is
> equirectangular, what's then the meaning of the h_fov and v_fov parameters?
> Do they define the field of view of the stereographic input (that would
> make sense),
> or do they define the field of view of the equirectangular output (that
> makes no sense, because equirectangular should always be 360° x 180°).

They are always used only for output when they make sense, for flat
and stereographic currently.

>
> Michael
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Re: V360 filter

Michael Koch
Paul,

>
> I'm working on dual fisheye output....

I've tested double-fisheye input and output and found no problems. This
can also be used for tilting of 180° single-fisheye images:

set "IN=IMG_077.jpg"     :: Input image or video
set "PITCH=0"            :: Rotation angle around X axis
set "YAW=10"             :: Rotation angle around Y axis
set "OUT=out.jpg"        :: Output image or video

ffmpeg -i %IN% -lavfi
"pad=w=2*iw:color=darkgreen,v360=input=dfisheye:output=dfisheye:yaw=%YAW%:pitch=%PITCH%,crop=w=iw/2:x=0"
-y %OUT%

Michael

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Re: V360 filter

Michael Koch
In reply to this post by Paul B Mahol
Am 12.09.2019 um 14:55 schrieb Paul B Mahol:

>
>> Question:
>> If the input format is stereographic and the output format is
>> equirectangular, what's then the meaning of the h_fov and v_fov parameters?
>> Do they define the field of view of the stereographic input (that would
>> make sense),
>> or do they define the field of view of the equirectangular output (that
>> makes no sense, because equirectangular should always be 360° x 180°).
> They are always used only for output when they make sense, for flat
> and stereographic currently.

In my opinion stereographic as input format is useless, if the algorithm
doesn't know the field of view of the input image.

Michael

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Re: V360 filter

Michael Koch
In reply to this post by Paul B Mahol
Paul,

> I'm working on dual fisheye output....

I've tested the new "ball" output format and found no problems. It gives
the same output as my workaround with the remap filter.

The only thing that's still missing is single-fisheye as input and
output format, with a user-defined field of view.

Michael

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