Subtracting one pixel with the neighboring pixel on the left

[real.finder]

as the title said, how can do subtracting one pixel with the neighboring pixel on the left in avs?

[wonkey_monkey]

Using rgba_rpn/y8_rpn (https://forum.doom9.org/showthread.php?t=172601) you could do this:


clip.rgba_rpn("[c0] [c0(-1,0)] -") # or y8_rpn for yuv clips - you can extractu and extractv to do the same processing on the chroma planes with separate calls to y8_rpn


This should work, but I'm in the middle of a big rewrite on that plugin so I may have got it wrong.

For a non-plugin method, you can crop/addborders or do a shifted resize to make a second clip, then use overlay with mode="subtract".

What's best depends on what you're really trying to achieve.

[johnmeyer]

Your request is somewhat similar to how a convolution kernel works:

http://avisynth.nl/index.php/GeneralConvolution

[wonkey_monkey]

Oh, yes, there you go - johnmeyer's solution is ths simplest.

[real.finder]

thank you both :)

GeneralConvolution only for rgba (I need YUV/Y since I am plan to make mask for Analog video artifacts), and rgba_rpn/y8_rpn not work with Y8 and since it's Closed source I do not tend to use it in scripts for many reasons (I have had enough suffering from deen() and others Marc FD/prunedtree filters not being update and get x64 builds)

so I think "crop/addborders or do a shifted resize to make a second clip, then use overlay with mode="subtract"" is the best option for now even if it not look nice as others

[pinterf]

Or use Expr in avs+, see pixel addressing
http://avisynth.nl/index.php/Expr

[wonkey_monkey]

rgba_rpn/y8_rpn not work with Y8

It does, that's what y8_rpn is for!

[real.finder]

It does, that's what y8_rpn is for!

it show unhandled clip type: -536870912 unless I use yv12

[real.finder]

Or use Expr in avs+, see pixel addressing
http://avisynth.nl/index.php/Expr

will check it

[real.finder]

ok, here simple function

Function spixsub(clip c, int "left", int "top")
{
left=Default(left, 1) #set the "left" to 2 will make it 2 pass since the subtract mode in overlay ignore the negative result of subtracting
top=Default(top, 0) #same as left parameter
c
left > 0 ? PointResize(Width(), Height(), src_left=-1) : last
leftsub = left > 0 ? overlay(c,last,mode="Subtract") : last
left > 1 ? overlay(leftsub,overlay(last,c,mode="Subtract"),mode="add") : leftsub
h=last
top > 0 ? c : last
top > 0 ? PointResize(Width(), Height(), src_top=-1) : last
topsub = top > 0 ? overlay(c,last,mode="Subtract") : last
top > 1 ? overlay(topsub,overlay(last,c,mode="Subtract"),mode="add") : topsub

top > 0 && left > 0 ? overlay(h,last,mode="add") : last
}

and mt_convolution seems can be used too, but it not give same output as above with mt_convolution("-1 1 0")

will see if avs+ Expr can do it better and cleaner, didn't test it yet, maybe I will add it in spixsub() since I don't want to drop normal avs support yet

edit: more advanced version https://pastebin.com/WkVUQDu5

edit2: final one with expr in avs+ added in Advanced Denoising.avsi (http://forum.doom9.org/showthread.php?p=1750019#post1750019)