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Re: [video-codec] Minor comments on draft-fuldseth-netvc-thor-00

"Arild Fuldseth (arilfuld)" <arilfuld@cisco.com> Sat, 11 July 2015 16:56 UTC

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From: "Arild Fuldseth (arilfuld)" <arilfuld@cisco.com>
To: Jean-Marc Valin <jmvalin@jmvalin.ca>, "Mo Zanaty (mzanaty)" <mzanaty@cisco.com>, "Timothy B. Terriberry" <tterribe@xiph.org>, "video-codec@ietf.org" <video-codec@ietf.org>
Thread-Topic: [video-codec] Minor comments on draft-fuldseth-netvc-thor-00
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Date: Sat, 11 Jul 2015 16:56:40 +0000
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References: <559C3EAA.2060809@xiph.org> <D93780CEB41CE1419C1A7542E3096BC210FED1C8@xmb-aln-x08.cisco.com> <D1C40F34.514DA%mzanaty@cisco.com> <55A01661.309@jmvalin.ca>
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Subject: Re: [video-codec] Minor comments on draft-fuldseth-netvc-thor-00
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For the time being, we have decided to limit the number of intra prediction modes to 8. In our simulations, the upright mode provides less coding gain than the other 8 modes. The quote is a typo. It should read:

 "The upleft direction is exactly 45 degrees"

Regards,

Arild

-----Original Message-----
From: Jean-Marc Valin [mailto:jmvalin@jmvalin.ca] 
Sent: 10. juli 2015 21:01
To: Mo Zanaty (mzanaty); Arild Fuldseth (arilfuld); Timothy B. Terriberry; video-codec@ietf.org
Subject: Re: [video-codec] Minor comments on draft-fuldseth-netvc-thor-00

I see in section 4 that there are only 8 intra modes including DC, rather than 9. I didn't understand why "upright" is missing, nor what "The upright and upleft directions are exactly 45 degrees" means in that context. Can you explain?

Cheers,

	Jean-Marc


On 07/09/2015 12:11 PM, Mo Zanaty (mzanaty) wrote:
> Another correction in section 9.2.6:
> Table 3, Index=2 should show abs(coeff)=4 and level=4.
> Figure 10, the last 0 should be removed.
> All corrections will be updated in a new draft version once submission 
> reopens.
> 
> Mo
> 
> On 7/8/15, 4:36 PM, video-codec on behalf of Arild Fuldseth (arilfuld) 
> <video-codec-bounces@ietf.org on behalf of arilfuld@cisco.com> wrote:
> 
> Tim,
> 
> Yes, you are right on all points.
> 
> Thank you for pointing that out.
> 
> Regards,
> 
> Arild
> 
> -----Original Message-----
> From: video-codec [mailto:video-codec-bounces@ietf.org] On Behalf Of 
> Timothy B. Terriberry
> Sent: 7. juli 2015 23:04
> To: video-codec@ietf.org
> Subject: [video-codec] Minor comments on draft-fuldseth-netvc-thor-00
> 
> In section 8.1.1, step 4, the calculations of c' and d' are supposed 
> to use subtractions instead of additions, right?
> 
> A similar question applies to the calculation of c' in 8.2.1 step 3.
> 
> In Table 3 in Section 9.2.6, index 9 should code (run=2,level>1), right?
> 
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