Comments on: Adaptive Post/Loop Filters in JM/KTA – Part 2

By: Jie Dong

Jie Dong — Fri, 24 Sep 2010 01:14:15 +0000

T and Q mean transform and quantization, respectively; similarly, T^{-1} and Q^{-1} mean inverse transform and dequantization, respectively.

By: rafi

rafi — Thu, 23 Sep 2010 23:06:00 +0000

Hi people , is it possible may i know whats is “T” and “Q” or T+Q in BALF

By: Rahul

Rahul — Mon, 13 Sep 2010 04:57:39 +0000

JCTVC-A033 was indeed very useful. I came across Coding Block Tree synchronized ALF in both A033 and B205. Are there other documents that describe this ALF in detail?

By: Jie Dong

Jie Dong — Sun, 12 Sep 2010 04:36:20 +0000

Maybe JCTVC-A033 is useful.

By: Rahul

Rahul — Sun, 12 Sep 2010 00:52:24 +0000

I am looking for a document that describes the algorithm for deblocking filter in H.265. It looks like this filter is different from the one used in H.264/AVC. Are there any documents describing/giving an overview other than JCTVC-A205?

By: Sandip Ray

Sandip Ray — Mon, 05 Oct 2009 10:02:39 +0000

Adaptive loop filter is an additional block apart from traditional in-loop deblocking filter. Wiener filter is a MSE-optimal stationary linear filter which estimates the original signal from the signal corrupted by additive noise. Here additive noise is the coding noise(mostly due to lossy quantization). Is it fair enough to assume that coding noise of every pixels in a frame have the same statistics ? Or should we group pixels with identical coding noise and apply Wiener filter on pixels within the same group ? I am thinking of some kind of segementation as proposed by Zhang.

By: Wenhao Zhang

Wenhao Zhang — Mon, 28 Sep 2009 07:34:29 +0000

In-loop filter is definitely better than the post filter. Qualcomm has proposed a similar Wiener adaptive filter scheme which used as post filter, but their gain is much smaller compared to BALF.

By: Jie Dong

Jie Dong — Sun, 27 Sep 2009 03:42:44 +0000

Using the filter in loop can improve the capability of predicting other pictures.

By: hurumi

hurumi — Sat, 26 Sep 2009 17:48:53 +0000

Do you think that BALF or QALF can provide much better efficiency compared to post-filter only design? I’m not sure that in-loop type is required for this kind of filtering.

By: Yu Liu

Yu Liu — Wed, 16 Sep 2009 07:42:09 +0000

The proposals of BALF/QALF didn’t describe how to get the array filter_luma_base/filter_chroma_base. I guess that it is obtained by a training set.