AVS-filter for sharpening

[gelo333]

Hello! Tell me the actual AVS-filter for sharpening the video. I'm using FFT3DGPU, it has a sharpening option. But I want to try a different filter, a better one.

[davexnet]

Take your pick
http://avisynth.nl/index.php/External_filters#Sharpeners

Or built-in
http://avisynth.nl/index.php/Sharpen

[gelo333]

Take your pick
http://avisynth.nl/index.php/External_filters#Sharpeners

I have seen this list. It has a lot of filters. That's why I asked which filter is good and modern. For H265 HD and FHD video middle quality.

[gelo333]

Help me, please.

At least tell me, are CAS, CASm, CASP good filters?

[jagabo]

CAS is good at what it does. I'm not familiar with CASm or CASP. But what sharpening filter you use depends on the nature of your video.

[davexnet]

Help me, please.

At least tell me, are CAS, CASm, CASP good filters?

You're much more likely to get some useful info if you provide a clip from your source.
I don't think it's one size fits all

[gelo333]

I would like to find the best universal way. I don't need to have a perfect result in every video.

[jagabo]

If there was a universal best way there would be no need for any others.

[gelo333]

My final request for help. Rate filters AWarpSharp2 and Finesharp.

I spent time learning about AWarpSharp2 functions. But when using it, it turned out that this filter makes a subtle effect of sharpening.

[davexnet]

You're going to have to do some reading and get an understanding of what your source needs.
Some sharpeners sharpen everything, some target the lines only, others are adaptive.

I've used Finesharp before, it sharpens everything, including imperfections and makes them worse - hence the warning it comes with
I've only ever used awarpsharp with NNEDI3_rpow2 prior to 2x upscale. I believe the theory is that it cleans up the edges a little.

For some specific recommendations post a sample of your source

You can use a script like this to do a side-by-side comparison

orig=lwlibavvideosource("I:\media\source.mkv")
sharpened=asharp(orig,d=7.0,b=3.0)
#sharpened=seesaw(orig)
stackhorizontal(orig,sharpened)

[gelo333]

I used ASharp. It doesn't make noise. This filter sharpens the edges very well, but not all other areas very well. And it increases the encoding time by 50%. At the same time, it significantly lowers the PSNR.

Do you think I can try further ASharp? Try different settings, etc. I'm confused by the release date of this filter in 2002.

[davexnet]

Download 1.0.0.7 from here.
https://github.com/Asd-g/AviSynth-ASharp/releases/

Yes, you may have to play with the settings to get it to your liking - true of most filters

[gelo333]

In other words, can I opt for Asharp? Is this filter relevant at the moment and is it suitable for modern video?

-----

I am confused by the work of some filters. For example, CASm after its use makes the video, on the contrary, more blurry. How is this possible??? I turn on the filter to get a sharper image, but the result is blurry. What was the developer thinking?

[davexnet]

In other words, can I opt for Asharp? Is this filter relevant at the moment and is it suitable for modern video?

-----

I am confused by the work of some filters. For example, CASm after its use makes the video, on the contrary, more blurry. How is this possible??? I turn on the filter to get a sharper image, but the result is blurry. What was the developer thinking?

Did you come to any conclusions? I've been reading some of the older posts and a few users like asharp with the following
settings. This is relatively gentle and there's an adaptive component. You can also add b= if the source is blocky, to avoid oversharpening the block noise

asharp(t=1,d=3)

[gelo333]

I didn't find the optimal solution. Since my main goal is to reduce the file size, I agree with the middle quality and the noise. But these sharpers do not give the desired result.

Asharp does a good job of sharpening edges, but does little to sharpen other objects, for example hair. The same can be said about the other Sharpers. It seems that they all care about working with anime.

In addition, as soon as the sharpness begins to approach the desired result, the file structure begins to collapse, which can be seen in the PSNR, and the file size also begins to progressively increase.

I have read good reviews about FineSharp. But the author of the filter himself said that this filter is for streaming video of excellent quality, and not for encoding files.

[davexnet]

I don't know if there is a specific relationship to PSNR and sharpening other than the fact that it will demand more bitrate
because you've introduced more details. If you use CRF encoding, the file size will increase, that's expected.
Or if you use a fixed bitrate (2-pass, etc) quality goes down.

I've used Finesharp once or twice, use it if you think it helps. Did you read this thread?
https://forum.doom9.org/showthread.php?t=166082

[jagabo]

In addition, as soon as the sharpness begins to approach the desired result, the file structure begins to collapse, which can be seen in the PSNR

PSNR and all the other image comparison metrics at base calculate the difference between pixels at the same location in the two images. Sharpening causes pixels at edges to get brighter or darker. To the metrics, even with a "perfect" sharpener, that's an error, not an improvement. So of course the PSNR rates badly relative to the source.

and the file size also begins to progressively increase

Sharper, more detailed video requires more bitrate. And indiscriminate sharpening increases noise -- increasing the bitrate requirement. Your expectation of smaller file sizes after sharpening is backward.

[poisondeathray]

I didn't find the optimal solution. Since my main goal is to reduce the file size, I agree with the middle quality and the noise. But these sharpers do not give the desired result.

Asharp does a good job of sharpening edges, but does little to sharpen other objects, for example hair. The same can be said about the other Sharpers. It seems that they all care about working with anime.

In addition, as soon as the sharpness begins to approach the desired result, the file structure begins to collapse, which can be seen in the PSNR, and the file size also begins to progressively increase.

I have read good reviews about FineSharp. But the author of the filter himself said that this filter is for streaming video of excellent quality, and not for encoding files.

all sharpeners will increase the bitrate (thus filesize) at a given CRF or quantizer .

all sharpeners will decrease the PSNR at a given bitrate

So the ideal solution for you is NOT to sharpen, since your main goal is reduce the file size

To reduce filesize and improve compressibility, you should denoise and also look at higher compression (encoders, encoding settings)

[gelo333]

Sharper, more detailed video requires more bitrate. And indiscriminate sharpening increases noise -- increasing the bitrate requirement. Your expectation of smaller file sizes after sharpening is backward.

My main problem is that I can't do the necessary sharpening.

Increasing the file size, reducing the metric, the appearance of noise, these are minor problems, I am ready for some compromises in this.

[gelo333]

I've used Finesharp once or twice, use it if you think it helps. Did you read this thread?
https://forum.doom9.org/showthread.php?t=166082

Yes, I read this thread. It was there that I read that the author of Finesharp says that this filter is needed for streaming video, not for encoding.

[gelo333]

all sharpeners will increase the bitrate (thus filesize) at a given CRF or quantizer .

all sharpeners will decrease the PSNR at a given bitrate

So the ideal solution for you is NOT to sharpen, since your main goal is reduce the file size

To reduce filesize and improve compressibility, you should denoise and also look at higher compression (encoders, encoding settings

I use CQP in hardware encode, VCEEnc 265 codec. I reduce video resolution, reduce bitrate, use denoiser. It is impossible to do without sharpness compensation.

[poisondeathray]

I use CQP in hardware encode, VCEEnc 265 codec. I reduce video resolution, reduce bitrate, use denoiser. It is impossible to do without sharpness compensation.

You don't "have to" sharpen . It' s not a strict requirement

You can try different scalers (resampling algorithms), a better encoder (VCEEnc 265 is probably among the worst HEVC encoders), a better denoiser suitable for your noise type. ( FFT3DGPU, mentioned in the 1st post, if that's what you're using for the denoising operation - is not considered that great)

You decide where you want to make tradeoffs.

[jagabo]

If you're downscaling a lot try DPID.
http://www.avisynth.nl/index.php/DPID

[gelo333]

I use CQP in hardware encode, VCEEnc 265 codec. I reduce video resolution, reduce bitrate, use denoiser. It is impossible to do without sharpness compensation.

You don't "have to" sharpen . It' s not a strict requirement

You can try different scalers (resampling algorithms), a better encoder (VCEEnc 265 is probably among the worst HEVC encoders), a better denoiser suitable for your noise type. ( FFT3DGPU, mentioned in the 1st post, if that's what you're using for the denoising operation - is not considered that great)

You decide where you want to make tradeoffs.

I'm using FFT3DGPU because it runs on the graphics card's GPU. This greatly speeds up the encoding time. For the same reason, I use VCEEnc.

I would be grateful if you tell me the denoise filter on VapourSynth. I don't need ideal optimization, a speedy and universal method is better.

[gelo333]

If you're downscaling a lot try DPID.
http://www.avisynth.nl/index.php/DPID

I change the resolution from 1080p to 720p. Do I need a DPID?

[gelo333]

Thanks for answering and trying to help me. And Happy New Year everyone!

[jagabo]

If you're downscaling a lot try DPID.
http://www.avisynth.nl/index.php/DPID

I change the resolution from 1080p to 720p. Do I need a DPID?

It's probably not going to look much different than something like Spline36Resize(). But you won't know for sure until you try it.

[VoodooFX]

I like LSFmod(defaults="slow")

[gelo333]

LSFmod is not a speed filter.

[Selur]

GLSL sharpeners are fast, if it's speed that is needed, looking into https://github.com/Asd-g/avslibplacebo and adaptive-sharpen.glsl might be worth a try.