Filters sharpeners and antialiasing

[charlesn73z]

Need to improve the sharpness and contour.

Even after using LSFmod(defaults="slow") and antialiasing (), the image is not as sharp as I expected.

I need help





In the video is more evident.

https://mega.co.nz/#!4lJ2nKDL!EV1rJDvlxBHfbdOKriHzXjuZAmsF8A0qx6iiopHpK1k

[jagabo]

The video already has over sharpening halos. But try some thing like:

Sharpen(0.5, 0)
aWarpSharp(depth=10)

Adjust to your liking.

[charlesn73z]

Jagabo, help me with a script for image stabilization.

[jagabo]

You can use Stab() to eliminate a little film bounce. It leaves small borders so you'll want to follow up with Crop() then AddBorders() if you need a fixed frame size. For slower shaking you'll need to use a full DePanStabilize() -- see the DePan docs. But that may lead to problems with panning shots.

Your video has something beyond film bounce though. There's some kind of time base error or non linear scanning problem that causes different parts of the frame to move differently. I don't know of any fixes for that.

[sanlyn]

I see that timing and object shifting problem quite often on various sources, usually "digitally remastered" tapes. An acquaintance tried several tbc devices including high-end players but it didn't solve the problem. I see it in movies broadcast on TCM and AMC that seem to have been digitized from tape masters. Often, noise or heavy grain will make mask it somewhat, so it becomes more visible after denoising. Very odd effect and no fix for it. Some versions of RemoveDirt help somewhat, but not completely.

[charlesn73z]

I used stab(),however the edge were moving.

[manono]

I used stab(),however the edge were moving.

You can use Stab() to eliminate a little film bounce. It leaves small borders so you'll want to follow up with Crop() then AddBorders() if you need a fixed frame size.

Did you not understand what he said? Crop those moving edges away.

[charlesn73z]

I used stab(),however the edge were moving.

You can use Stab() to eliminate a little film bounce. It leaves small borders so you'll want to follow up with Crop() then AddBorders() if you need a fixed frame size.

Did you not understand what he said? Crop those moving edges away.

What I use arguments AddBorders?

[jagabo]

What I use arguments AddBorders?

It depends on what you need. If you're making a DVD you have to stick with 704x576 or 720x576 (PAL), or 704x480 or 720x480 (NTSC) frame sizes. If you're not making a DVD you may still need to stick with frame sizes that are compatible with your video codec (often mod 4, 8 or 16).

[sanlyn]

How you crop and restore borders depends on the elements jagabo mentioned, plus colorspace, etc.

Crop: http://avisynth.org/mediawiki/Crop
AddBorders: http://avisynth.org/mediawiki/AddBorders

Your video sample was NTSC 720x480 29.976 fps, progressive (non-interlaced, no pulldown), YV12.

Crop(2,2,0,0).AddBorders(2,2,0,0)

Different videos might need different values.

[charlesn73z]

What I use arguments AddBorders?

It depends on what you need. If you're making a DVD you have to stick with 704x576 or 720x576 (PAL), or 704x480 or 720x480 (NTSC) frame sizes. If you're not making a DVD you may still need to stick with frame sizes that are compatible with your video codec (often mod 4, 8 or 16).

I'm not achieving. Show me how it's done with this video, please.

http://uploaded.net/file/tnu5v1fm

[jagabo]

I'd probably just crop that by 8 pixels on the left and right then leave it like that (704x480):

 Crop(8,0,-8,-0)

That leaves you with mod 16 dimensions, compatible with DVD and any codec.

[charlesn73z]

Guys how do I remove these white spots?

[jagabo]

That looks like ghosting from another frame. Probably from too much temporal noise reduction.

[charlesn73z]

Can anyone tell me some filters to improve the sharpness of this video?

thank you

https://mega.co.nz/#!414m3TDI!YYD1X2myELct1AOKRzl1gjCT5IY9JWIlDfr8GEA0un0

[manono]

I don't see that it needs any sharpening. Why reencode something that's already been reencoded at least once if it doesn't need it?

If you want to sharpen something, then use a sharpener. Here, take your pick:

http://avisynth.nl/index.php/External_filters#Sharpeners

And there's always the built-in AviSynth Sharpen filter:

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

[charlesn73z]

I formatted my computer now to make an encode with the same script before formatting, I get different results, what can be wrong?

[charlesn73z]

Can anyone help?

Used antialiasing, but it was not enough, I have tried several filters and does not solve this problem at the edges.

[jagabo]

I don't see the problem.

[sanlyn]

Well...if you look really really really close and for a long time, there is some line softening and a pinch of chroma shift or bleed (1/2 pixel?). The right side of the distant figure's white cape shows a smidgeon of red along one edge. Here and there, a remnant that looks like ringing. That sort of thing.

I hit the image with DeHalo_Alpha and corrected a more annoying problem (for me). There are no clean blacks. They're blue. Is the big guy supposed to have blue hair?


[Attachment 19651 - Click to enlarge]

Maybe a moving image would show something more apparent ?

[charlesn73z]

Was as far as it went, but as I have no experience with it, like an opinion from someone with more knowledge to identify possible defects and point me solutions, thanks.

http://uploaded.net/file/inbwqfu3

[jagabo]

Well...if you look really really really close and for a long time, there is some line softening and a pinch of chroma shift or bleed (1/2 pixel?)...

But he was complaining about aliasing.

[charlesn73z]

That's right, I can only see aliasing problem, but may have more problems, as I mentioned before I do not have as much knowledge as you.

[sanlyn]

Lines look very slightly soft due to low bitrate (if you blow the image up a few times), but I don't see aliasing.

[sanlyn]

Was as far as it went, but as I have no experience with it, like an opinion from someone with more knowledge to identify possible defects and point me solutions, thanks.

http://uploaded.net/file/inbwqfu3

No aliasing in this sample. There are other problems caused by a very low bitrate -- with all the bad frame hop and shudder, a low bitrate has problems maintaining a completely stable image, so you have some "wiggles" and flutter now and then especially with fast-moving scenes. Otherwise I didn't see other major problems.

[theewizard]

all i see is black hair

are you sure the color on your PC is set correctly ?

there is nothing wrong in that picture that i would spot watching a video

[sanlyn]

all i see is black hair

In the first image posted earlier, there are no clean blacks. The boots, big blob of hair on the big guy, and other objects that look as if they should be black have typical readings of RGB 10-12-30, which has a visible and measurable dark blue tint.

Below: crop of the original image post (left) and corrected image (right). The background border is RGB16. If both look the same or black to you, your monitor might need a better calibration. I use an iOne colorimeter and software for mine.

[Attachment 19690 - Click to enlarge]

But it's anime, so for all I know the original could be correct. Note that the forum image is rather dark -- at least it looks that way in my browsers, and the border color reads RGB8 instead of RGB16. Correcting for gray has the skin color on the right looking a bit more vibrant (less midtone blue). Most viewers wouldn't be so picky.

[charlesn73z]

Watch the videos:

https://mega.co.nz/#F!ssIEFTjZ!e9xkGyMCzo9XKT6FBY3p4A

password: dfg


When you reach this point, compare both:



Look the legs of Raditz, the outline or edges of the image are blurred in my version. And in another video that does not happen. That's what I want to solve.

[sanlyn]

Your version is sharper and cleaner than the original. The original suffers from a very low bitrate (and so does yours) and frame hopping. You can't expect a low bitrate to "raise" the quality of the original. IF you want to get better quality, then filter as you have done, then stabilize the image and use a higher bitrate. The lower the bitrate, then less data is present to properly describe and control the image.

[charlesn73z]

Your version is sharper and cleaner than the original. The original suffers from a very low bitrate (and so does yours) and frame hopping. You can't expect a low bitrate to "raise" the quality of the original. IF you want to get better quality, then filter as you have done, then stabilize the image and use a higher bitrate. The lower the bitrate, then less data is present to properly describe and control the image.

Used 2100 bitrate, if I increase will get a size too big for a dvd-rip, or am I mistaken?