vcmove a plugin for vapoursynth

[vcmohan]

vcmove is a plugin developed for vapoursynth, by modifying and improving plugins originally developed for avisynth. This plugin moves pixels as per requirement. Useful for correcting certain distortions or tilt or for transitions. The functions included in this are:

1.Rotate
2.DeBarrel
3.Quad2Rect
4.Rect2Quad

A full description of this plugin is at vcmove
Works for windows. Comments, suggestions are welcome.

[sl1pkn07]

any plan to share the code?

to try to build for linux

greetings

PS: also vcfreq and vcmod

[vcmohan]

Certainly. I am waiting for a few error reports or comments or suggestions. Then I will tidy up and make the code available. If in the present condition itself I should do that, in a few days it will be done.

[Myrsloik]

You'll make 64bit compiles for windows too, right?

[vcmohan]

I wish to. In my VC++ compiler some one mentioned that I have to add "windows 64" or I am not sure, whether it will accept. I do wish to know exactly what I need to add.

[Efenstor]

I am struggling to compile vcmove under Linux (x64), but as there's no Makefile I don't know where to start.

P.S.: by the way, vcmohan did not provide a link to the vcmove source code on the site, so I needed to figure it out by analogy with the other links: http://www.avisynth.nl/users/vcmohan.../vcmove_src.7z

[Are_]

mv ReformHelper.cpp reformHelper.cpp
gcc -fPIC -shared -std=c++11 vcmove.cpp -o libvcmove.so

[vcmohan]

Sorry for the missing link. Now it is included.

[Efenstor]

Originally Posted by Are_

mv ReformHelper.cpp reformHelper.cpp
gcc -fPIC -shared -std=c++11 vcmove.cpp -o libvcmove.so

Thanks a lot!!! And thanks to you, mr. Mohan!

[Efenstor]

DeBarrel produces weird banding artifacts, which are most noticeable on the sky. For a test, I have debarrelled a simple white clip (see the attachment). I had implemented Lanczos interpolation many years ago when I was into programming, and remember that the code included some "equalization" technique, without which the image contained somewhat noticable "pits". I wonder may it be the case with vcmove? No equalization I mean. Please, can you fix this, as barrel correction may be the main reason I has gotten into the VapourSynth stuff.

[Efenstor]

I've remembered! When I did my coding, I didn't implement Lanczos from scratch, but instead adopted and modified the image resize function from ImageMagick. Can this be of any help?

[vcmohan]

Thanks for pointing out. While the formulation for avisynth was integer maths, for vapoursynth I had to change it to floating point. I have now included some checks in the Lanczos interpolation and uploaded. I still see even though much reduced a greenish hue when I use white blank clip. Please check it. I will try with bicubic or use integers float hybrid to make it better. May take a few days.

[Efenstor]

Originally Posted by vcmohan

Thanks for pointing out. While the formulation for avisynth was integer maths, for vapoursynth I had to change it to floating point. I have now included some checks in the Lanczos interpolation and uploaded. I still see even though much reduced a greenish hue when I use white blank clip. Please check it. I will try with bicubic or use integers float hybrid to make it better. May take a few days.

Thank you! But I still see the moiré pattern. Interestingly enough, I don't see any greenish hue you mentioned, and analysing a screenshot in Gimp shows that the RGB values are identical (although all lesser than 255,255,255).

Here is my test script, in case you need it:

import vapoursynth as vs
core = vs.get_core()

clip = core.std.BlankClip(width=1920, height=1080, length=100, color=(255,255,255))
clip = core.vcmove.DeBarrel(clip=clip, a=0.005, b=0.009, c=0.085)
clip = core.resize.Bilinear(clip=clip, format=vs.YUV420P8, matrix_s="709")
clip.set_output()

[Efenstor]

I have just checked: there is the greenish cast indeed, but only in the YUV444 colorspace. In RGB24 it's all okay.

[vcmohan]

I have modified code. Hopefully it should work now. Please check the new update.

[Efenstor]

Originally Posted by vcmohan

I have modified code. Hopefully it should work now. Please check the new update.

That's it: no moiree, no greenish cast! It's all cool now!

[vcmohan]

Made a very small change. May not be visible in results most of the time. But uses a better approximation. Sorry for trouble. But pl use the newest.

[Efenstor]

Originally Posted by vcmohan

Made a very small change. May not be visible in results most of the time. But uses a better approximation. Sorry for trouble. But pl use the newest.

Trouble??? Every little line of useful code added to the world of libre software is worth more than gold.

[sl1pkn07]

Hi.

the sources on http://www.avisynth.nl/users/vcmohan.../vcmove_src.7z is changes/updates recently? the SHA256 of the older file downloaded in 09-04-2016 and the new file downloaded today is different

┌─┤[$]|[sl1pkn07]|[sL1pKn07]|[~/aplicaciones/vapoursynth-plugin-vcmove]|
└───╼  ls *7z*
-rw-r--r-- 1 sl1pkn07 users 23017 abr 21 15:31 vcmove-src.7z
-rw-r--r-- 1 sl1pkn07 users 22858 abr  9  2016 vcmove-src.7z.
┌─┤[$]|[sl1pkn07]|[sL1pKn07]|[~/aplicaciones/vapoursynth-plugin-vcmove]|
└───╼  sha256sums *7z*
bash: sha256sums: no se encontró la orden
┌─┤[$]|[sl1pkn07]|[sL1pKn07]|[~/aplicaciones/vapoursynth-plugin-vcmove]|
└───╼  sha256sum *7z*
18d99e51d0d2ebf12274a23c92977ee11e1427dded1875390709e8203c7af0ec  vcmove-src.7z
63c425d67a839c8993a6e52a778b6bfe42c38cb4ad472fbab3e8661a90d3b8ef  vcmove-src.7z.

greetings

[Are_]

Somewhat:

$ for i in $(ls -1); do echo $i && diff $i ../vcmove_src/$i ; done
Clamp.h
11c11,12
<       return val < min ? min : val > max - 0.5f ?  max : val;
---
>       val += 0.5f;
>       return val < min ? min : val > max  ?  max : val;
CubicIntCoeff.cpp
CubicIntCoeff.h
LaQuantileInterpolate.cpp
LanczosCoefficients.cpp
LinearIntCoeff.cpp
ReformHelper.cpp
UnitSq2Quad_matrix.cpp
VSHelper.h
VapourSynth.h
moveDeBarrel.cpp
moveQuad2Rect.cpp
moveRect2Quad.cpp
moveRotate.cpp
vcmove.cpp