Opened 8 years ago

Closed 8 years ago

#1162 closed defect (fixed)

something about about delta_poc_s0_minus1

Reported by: charles.lee Owned by:
Priority: minor Milestone: HM-12.1
Component: HM Version: HM-12.0
Keywords: Cc: fbossen, ksuehring, davidf, jct-vc@…

Description

in hevc spec 7.4.8,about delta_poc_s0_minus1

it wrote "when i is greater than 0, specifies the difference between the picture order count values of the i-th entry and the ( i + 1 )-th entry in the stRpsIdx-th candidate short-term RPS that have picture order count values less than the picture order count value of the current picture"

but i think when i is greater than 0,delta_poc_s0_minus1 should specify between the picture order count values of the i-th entry and the ( i - 1 )-th entry ?? the above (i+1) have confuse me!

Change History (4)

comment:1 Changed 8 years ago by DefaultCC Plugin

  • Cc fbossen ksuehring davidf jct-vc@… added

comment:2 Changed 8 years ago by charles.lee

for example:

'POC: 20 21 22
RPS (POC, used_by_curr_pic_s0_flag):

(19,0) (20,1) (21,0)
(16,1) (19,1) (20,1)

(16,0) (16,1)

RPS (delta_poc_s0, used_by_curr_pic_s0_flag)
delta_poc_s0 = (-1)x(delta_poc_s0_minus1 +1)

(-1,0) (-1,1) (-1,0)
(-3,1) (-1,1) (-1,1)

(-3,0) (-4,1)

so,in the picture 21, it has reference pics as 20,19 and 16.
when the current picture is 21,the stRpsIdx-th candidate short RPS is

(20,1)
(19,1)
(16,0)

the delta_poc_s0_minus1,for the entry i is 0,is the difference between the current(21) and picture 20,so the delta_poc_s0_minus1 value is 1,
when the entry i is 1(greater than 0),i think the delta_poc_s0_minus1 is between the i(pic 19) and i-1(pic 20),so i think this method is contradiction with hevc specfication???

Last edited 8 years ago by charles.lee (previous) (diff)

comment:3 Changed 8 years ago by adarsh

I think this is a typo in the HEVC Spec., and should be a WD ticket.

I think the issue raised is correct. The semantics of delta_poc_s0_minus1 and delta_poc_s1_minus1 should be corrected as follows.

delta_poc_s0_minus1[ i ] plus 1, when i is equal to 0, specifies the difference between the picture order count values of the current picture and i-th entry in the stRpsIdx-th candidate short-term RPS that has picture order count value less than that of the current picture, or, when i is greater than 0, specifies the difference between the picture order count values of the ( i - 1 )-th entry and the i-th entry in the stRpsIdx-th candidate short-term RPS that have picture order count values less than the picture order count value of the current picture. The value of delta_poc_s0_minus1[ i ] shall ...

delta_poc_s1_minus1[ i ] plus 1, when i is equal to 0, specifies the difference between the picture order count values of the current picture and the i-th entry in the stRpsIdx-th candidate short-term RPS that has picture order count value greater than that of the current picture, or, when i is greater than 0, specifies the difference between the picture order count values of the i-th entry and ( i - 1 )-th entry in the current candidate short-term RPS that have picture order count values greater than the picture order count value of the current picture. The value of delta_poc_s1_minus1[ i ] shall ...

comment:4 Changed 8 years ago by fbossen

  • Resolution set to fixed
  • Status changed from new to closed

Appears fixed in JVTVC-O0054

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  • Adarsh Krishnan Ramasubramonian(Participant)
  • charles(Reporter, Participant)
  • David Flynn(Subscriber)
  • Frank Bossen(Subscriber, Participant)
  • jct-vc@…(Subscriber)
  • karl.sharman@…(Always)
  • Karsten Suehring(Subscriber, Always)