Compressibility with: Soft, Neutral, Sharp, Simple resize filters (little test)

[jonny]

I've run a little test to compare the resizing methods in the new GKnot:



Resize method and Compressibility test values:

Soft Bicubic: 69.53%
Simple: 65.73%
Neutral Bicubic: 62.53%
Sharp Bicubic: 59.80%


Simple is something between Soft and Neutral.
The speed increase is about 25% !!! :)


PS
What do you think about quality? For me seems very good!

[Acaila]

I've used the SimpleResize filter this side of forever, and I must say it has it's qualities.
The speed advantage is VERY nice, and also the pure unblurred picture look very good. However it's still bilinear by design and you can see that if you look closely. Especially on thin sharp lines you can see the "stepping" that is common for bilinear resizing.

So I use this filter for all the tests I run because it makes them go faster, but for my movie backups I still always use neutral bicubic coz that still looks better than any bilinear resizing.

I once asked trbarry to make a SimpleResize equivalent for bicubic (that would be heaven! :D) but he said he didn't know how avisynth's bicubic used the b and c parameters to achieve it's blurring/sharpening effect. So he didn't know how to implement his code into a bicubic filter.

[jonny]

I once asked trbarry to make a SimpleResize equivalent for bicubic (that would be heaven!)


Yes, the same speed for the bicubic would be a BIG thing!

[ookzDVD]

@simpleresize is fast, ok, but...
the crop is must be divided by 4 for width and height...
if not... i got the green line at the right side.
that's killing me :(

[Apfelstruhdl]

can the speed up code of simpleresize just be used for the current resize method with exactly the results it is giving at the moment. Or could the code be used to write a very fast biliniear and several bicubic filters?

i very much like simpleresize, but speed is the main advantege of it atm and its disadvantage is that it has a fixed quality.

So more faster filters wich blur more or sharp more would be great.
(if it is possible)



Apfelstruhdl

[Ravendark]

Originally posted by ookzDVD
@simpleresize is fast, ok, but...
the crop is must be divided by 4 for width and height...
if not... i got the green line at the right side.
that's killing me :(

What do you mean by that?The cropping values must be numbers that can be divided by 4?

[evilhomer]

/
/ bilinear
/


_|
_| simpleresize
_|


jaggies everywhere! you can't get a straight line out of it. the speed is nice, but it's not worth it IMHO.

[theReal]

In my little test (which wasn't really long and out of the middle of a DVD) the Simple Resize filter was much closer to Neutral resize than to Soft Bicubic (only like 0.5% better than neutral bicubic). It looked about the same as precise bilinear in VDub (that is not really good, a little washed out, but no jaggies, though). Precise bilinear, however, was about 8% better than Neutral Bicubic and about 2% better than Soft Bicubic. On the downside, Precise Bilinear is about 25% slower than the bicubic filters...