Sharpening filter for blurry images

[x264]

Which avisynth sharpening filter should i use on blurry/soft images?

[smrpix]

Images blur for all kinds of reasons and require different treatment. I usually start with the built-in sharpen filter and see if it makes a difference. Trial and error on a short clip is your best bet.

Here's more:
http://avisynth.nl/index.php/External_filters#Sharpeners

[x264]

Should i use imagesource() for opening .png image files with avspmod editor?

[poisondeathray]

Should i use imagesource() for opening .png image files with avspmod editor?

Yes, that is one option that will work

[x264]

I got this error when i used awarpsharp2 filter.

[poisondeathray]

Some filters require YUV input or certain YUV subsampling like YV12. Your jpg is probably YUV encoded, but imagesource will output RGB data. You would need to use ConvertToYV12() or something similar

The new awarpsharp4xx rewrite handles YV24 if you use avisynth 2.6.x . YV24 uses full chroma, so if your source jpg had full chroma (not subsampled), you would have less quality loss. 99% of jpg images are YUV internally ,but you asked about PNG
http://forum.doom9.org/showthread.php?t=171488

There is a jpegsource that can return YUV natively (it also has jpeg reconstruction passes to reduce jpeg artifacts), and FFMS2 will return YUV as well from YUV jpeg's
http://forum.doom9.org/showthread.php?t=170028

The type of "blurriness" determines what filter(s) you might use. For example, for directional motion blurring you might use a deconvolution filter. Generic sharpening won't work as effectively in that scenario

[x264]

The images which i open with imagesource() are loaded in the wrong order(flipped), also why are the error messages flipped?

[poisondeathray]

You're probably using an old avisynth version with the flipped RGB output bug. Try updating your avisynth version to the current one

[x264]

i'm using avisynth 2.6 from here http://forum.doom9.org/showthread.php?t=172213. I tried reinstalling avisynth but no change.

[poisondeathray]

save your avs script, and open it in vdub, is image flipped there also ? (does it only affect avspmod, and what version of avspmod are you using)

[jagabo]

Or just flip them in AviSynth with FlipVertical() or whatever is necessary.

[x264]

I opened the .avs file in virtualdub, its the same as in avspmod. Also i installed AviSynth 2.6.0 [May 31st, 2015] but when i type version() in avspmod its showing avisynth build march 31.

[jagabo]

I opened the .avs file in virtualdub, its the same as in avspmod.

Of course.

Also i installed AviSynth 2.6.0 [May 31st, 2015] but when i type version() in avspmod its showing avisynth build march 31.

Just use FlipVertical().

[x264]

I used flipvertical and fliphorizontal, it didnt work. The image is still flipped in the wrong order.

General
Complete name : C:\Users\xyz\Pictures\My Scans\Scan_Pic0004.jpg
Format : JPEG
File size : 5.11 MiB

Image
Format : JPEG
Width : 2 304 pixels
Height : 3 568 pixels
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Compression mode : Lossy
Stream size : 5.11 MiB (100%)

[jagabo]

Mabye it's rotated 180 degrees? Try:

TurnRight()
TurnRight()

Otherwise, upload an image that has the problem.

By the way, you can only sharpen images/video by a small amount. You will not be able to turn a blurry mess into a pristine image.

[x264]

Calling TurnRight() 3 times fixed the problem.

[jagabo]

You can call TurnLeft() once instead.

[pandy]

Alternatively you may use deconvolution https://en.wikipedia.org/wiki/Deconvolution (blind deconvolution https://en.wikipedia.org/wiki/Blind_deconvolution ) approach.

http://bigwww.epfl.ch/algorithms/deconvolutionlab/
http://rsb.info.nih.gov/ij/download.html