Rududu codec : new test version - Page 11

LigH · 26th February 2004, 19:10

*Cough* - blowing the dust off this thread...

Seems that there is no further development since september; how bad, this could have been such a great project.

rududu author · 27th February 2004, 09:50

well, not so dead, just "sleeping".
I will continue the developpement, but I have no time at the moment.

Nicolas

LigH · 28th February 2004, 11:55

So, at least, thank you for this "sign of life", and best whishes!

unmei · 28th February 2004, 15:41

hey yeah, thanks for clearing the situation, nicolas! Take your time, i'm just glad you haven't given up

pieter1976 · 2nd March 2004, 19:43

I think a Wavelet is a kind of interpolation.

Not a very good one.

I wonder if better compression ratio's could be achieved using better interpolations.

http://audio.rightmark.org/lukin/gra...resampling.htm

This is dynamic interpolation using edge enhancement.

d'Oursse · 2nd March 2004, 20:15

Quote:

Originally posted by pieter1976
I think Wavelet is a kind of interpolation.

no, not at all.

interpolation is getting information with few data (you have the values of a function at points 0 and 1. You want a approximated value of this function for all real numbers between 0 and 1, for example)

wavelets (more precisely a wavelet basis) are a way to describe information (a function) at different levels of detail (sorry for this very short description).

If you are interested, look at books and papers of Y. Meyer, S. Mallat, I. Daubechis, A. Cohen and so many other authors about wavelets.

pieter1976 · 2nd March 2004, 20:24

This is what i know about wavelets

It first uses a image that is smaller than the size of the origenal.

second the resolution is increased.

pixels are smoothed

detail is added

resolution is increased

pixels are smoothed

detail is added

enz..

enz..

the part of increasing the resolution and smoothing the pixels is called interpolation.

please tell me if I am wrong.

Lefungus · 2nd March 2004, 20:53

You're wrong.
It'll be too tedious to explain wavelets on a forum in a foreign language. Like D'Oursse, i suggest you grab a book on the subject. There are also many sites on the subject that may interest you

pieter1976 · 2nd March 2004, 22:31

I have looked at several paper and even made a computer program in Delphi to test it and it gave similar results.

these are the basics

You use four pixels

12
34

Than calculate the everage of the four pixels(low resolution part)
after that calculate the high frequenties (detail information)

Do this in a recursive way

The high frequenties values are compressed by losing bits.

http://www.acm.org/crossroads/xrds6-...imgcoding.html

Lefungus · 5th March 2004, 23:20

Quote:

Originally posted by pieter1976

http://audio.rightmark.org/lukin/gra...resampling.htm

This is dynamic interpolation using edge enhancement.

This is off topic, but i would love to have a smart-edge resize avisynth filter

pieter1976 · 5th March 2004, 23:41

yes that would be great. It must be posible to make dvd resolution frames out of VHS frames and still have a good quality.

Lefungus · 5th March 2004, 23:46

The authors doesn't seem to offer some source code though :/

pieter1976 · 5th March 2004, 23:50

I have made a smartedge filter but it is very slow and i don't know how to make one for a program like virtualdub.
It also needs some more work to be ready.

Does someone know how?

maybe a thread on this subject should be started.

Selur · 5th March 2004, 23:53

yeah, a (avisynth/directshow) resizer with this might be cool, but without any sourcecode or at least a paper that discribes it,...

hoping for rududu author to find some time to develop rududu a bit

(I like the codec and like LigH I think it is a great project)

Cu Selur

kilg0r3 · 1st May 2004, 10:34

Hey Nicolas,

I don't know if you are still listening, but what about joining your project with that of the BBC?

2nd August 2005, 17:30

Hmm, over a year on and no more news? Even if it's just another - "I'm still alive, I have no time to work on it and I'm unlikely to in the future. Here's the source code."

General Lee D. Mented · 2nd August 2005, 18:25

Quote:

Originally Posted by superdump

Hmm, over a year on and no more news? Even if it's just another - "I'm still alive, I have no time to work on it and I'm unlikely to in the future. Here's the source code."

Boo!!

Sirber · 2nd August 2005, 19:24

already 1 year?

3rd August 2005, 00:04

Quote:

Originally Posted by General Lee D. Mented

Boo!!

Hello there GLDM. How are you doing? Any progress with WARP?

issa · 3rd August 2005, 04:39

Quote:

Originally Posted by pieter1976

I have looked at several paper and even made a computer program in Delphi to test it and it gave similar results.

these are the basics

You use four pixels

12
34

Than calculate the everage of the four pixels(low resolution part)
after that calculate the high frequenties (detail information)

Do this in a recursive way

The high frequenties values are compressed by losing bits.

http://www.acm.org/crossroads/xrds6-...imgcoding.html

You can said decoding process is kind of interpolation. However, in interpolation, you are guessing the thing in between, but the in wavelet, you alway have the orignal (sort of) information of the gap.

28th February 2004, 15:41	#204 \| Link
unmei frying subs Join Date: Jan 2003 Location: ch-2500 Posts: 891	hey yeah, thanks for clearing the situation, nicolas! Take your time, i'm just glad you haven't given up __________________ -nyo

2nd March 2004, 19:43	#205 \| Link
pieter1976 Registered User Join Date: Jan 2004 Location: Netherlands Posts: 85	Interpolation I think a Wavelet is a kind of interpolation. Not a very good one. I wonder if better compression ratio's could be achieved using better interpolations. http://audio.rightmark.org/lukin/gra...resampling.htm This is dynamic interpolation using edge enhancement. Last edited by pieter1976; 2nd March 2004 at 20:07.

2nd March 2004, 20:24	#207 \| Link
pieter1976 Registered User Join Date: Jan 2004 Location: Netherlands Posts: 85	This is what i know about wavelets It first uses a image that is smaller than the size of the origenal. second the resolution is increased. pixels are smoothed detail is added resolution is increased pixels are smoothed detail is added enz.. enz.. the part of increasing the resolution and smoothing the pixels is called interpolation. please tell me if I am wrong. Last edited by pieter1976; 2nd March 2004 at 20:33.

2nd March 2004, 20:53	#208 \| Link
Lefungus Registered User Join Date: Apr 2002 Location: Bretagne Posts: 192	You're wrong. It'll be too tedious to explain wavelets on a forum in a foreign language. Like D'Oursse, i suggest you grab a book on the subject. There are also many sites on the subject that may interest you __________________ Some old avisynth filters

5th March 2004, 23:46	#212 \| Link
Lefungus Registered User Join Date: Apr 2002 Location: Bretagne Posts: 192	The authors doesn't seem to offer some source code though :/ __________________ Some old avisynth filters

26th February 2004, 19:10	#201 \| Link
LigH German doom9/Gleitz SuMo Join Date: Oct 2001 Location: Germany, rural Altmark Posts: 6,782	Cough - blowing the dust off this thread... Seems that there is no further development since september; how bad, this could have been such a great project.

27th February 2004, 09:50	#202 \| Link
rududu author Nicolas Join Date: Aug 2002 Location: france - grenoble Posts: 40	well, not so dead, just "sleeping". I will continue the developpement, but I have no time at the moment. Nicolas

28th February 2004, 11:55	#203 \| Link
LigH German doom9/Gleitz SuMo Join Date: Oct 2001 Location: Germany, rural Altmark Posts: 6,782	So, at least, thank you for this "sign of life", and best whishes!

2nd March 2004, 22:31	#209 \| Link
pieter1976 Registered User Join Date: Jan 2004 Location: Netherlands Posts: 85	I have looked at several paper and even made a computer program in Delphi to test it and it gave similar results. these are the basics You use four pixels 12 34 Than calculate the everage of the four pixels(low resolution part) after that calculate the high frequenties (detail information) Do this in a recursive way The high frequenties values are compressed by losing bits. http://www.acm.org/crossroads/xrds6-...imgcoding.html

5th March 2004, 23:41	#211 \| Link
pieter1976 Registered User Join Date: Jan 2004 Location: Netherlands Posts: 85	yes that would be great. It must be posible to make dvd resolution frames out of VHS frames and still have a good quality.

5th March 2004, 23:50	#213 \| Link
pieter1976 Registered User Join Date: Jan 2004 Location: Netherlands Posts: 85	I have made a smartedge filter but it is very slow and i don't know how to make one for a program like virtualdub. It also needs some more work to be ready. Does someone know how? maybe a thread on this subject should be started. Last edited by pieter1976; 5th March 2004 at 23:53.

5th March 2004, 23:53	#214 \| Link
Selur Registered User Join Date: Oct 2001 Location: Germany Posts: 7,277	yeah, a (avisynth/directshow) resizer with this might be cool, but without any sourcecode or at least a paper that discribes it,... hoping for rududu author to find some time to develop rududu a bit (I like the codec and like LigH I think it is a great project) Cu Selur

1st May 2004, 10:34	#215 \| Link
kilg0r3 ! - User - ! Join Date: Nov 2001 Posts: 1,081	Hey Nicolas, I don't know if you are still listening, but what about joining your project with that of the BBC? __________________ Keep your tone warm and your sigs decent!

2nd August 2005, 17:30	#216 \| Link
superdump Guest Posts: n/a	Hmm, over a year on and no more news? Even if it's just another - "I'm still alive, I have no time to work on it and I'm unlikely to in the future. Here's the source code."

2nd August 2005, 19:24	#218 \| Link
Sirber retired developer Join Date: Oct 2002 Location: Canada Posts: 8,978	already 1 year? __________________ Detritus Software