topic Re: Effect of Deblocking Filter in i.MX Processors

Effect of Deblocking Filter

masa-i — Fri, 06 May 2016 22:33:38 GMT

I'm checking the effect of deblocking filter in H.264 Encoding on i.MX6.
I've been evaluating the effect by changing related parameters
avc_disableDeblk
avc_deblkFilterOffsetAlpha
avc_deblkFilterOffsetBeta

In the H.264 encoded stream (I've been checking with analyzing the stream), deblocking filter is effective.

But the actual effect of the filter can't be confirmed with a decoded image.
(I've checked it by combination of various parameters.)

Did anyone inspect the effect of DBF?

Re: Effect of Deblocking Filter

Aemj — Tue, 17 May 2016 00:42:25 GMT

Dear team,

Sorry for rushing you but we still wait for your comment.

BR,

Miyamoto

Re: Effect of Deblocking Filter

b36401 — Thu, 19 May 2016 05:32:21 GMT

Actually deblocking filter is turned on by default in i.MX6 VPU.

Please refer chapter 69 "Video Processing Unit (VPU)"

of i.MX 6Dual/6Quad Applications Processor Reference Manual for the details.

By the way generally there is no need to change the default setting of 0:0 for alpha:beta

as it gives very good results for a wide range of videos.

Have a great day,

Victor

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Re: Effect of Deblocking Filter

masa-i — Thu, 19 May 2016 09:21:29 GMT

Dear Victor,

Thank you for the information. But I'd like to confirm its effect.

Nothing can confirm the difference in decoding picture in a case with/witout DBF.

Is there a good idea to confirm effect of DBF ?

regards,

Masahiro