CE3: Motion prediction for texture coding (28) Summary (1)
14.1.1.1.1.1.1.1.20JCT3V-G0023 CE3: Summary report on motion prediction for texture coding [J.-L. Lin, J. Heo]
Test 1: AMVP candidate list construction for DCP blocks
JCT3V-G0065 is the CE3 results for new AMVP candidate list construction.
In the contribution document, the refined disparity of neighboring blocks, which has been used for merge process, is inserted into the AMVP candidate list. This replaces the zero candidate in case when a candidate is unavailable.
Coding results of the CE contribution G0065
G0065
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Video 1
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Video 2
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Video/video BR
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Video/total BR
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Synthesized/total BR
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Enc time
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Dec time
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With DoNBDV
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-0.21%
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-0.19%
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-0.08%
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-0.09%
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-0.07%
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99.7%
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105.7%
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With NBDV
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-0.08%
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-0.05%
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-0.04%
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-0.04%
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-0.03%
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99.5%
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103.1%
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Current AMVP is identical to base spec., this proposal would change the candidate list construction.
No simplification, though probably the worst case complexity would not be increased, the gain is marginal. No action.
Test 2: Additional depth-based DV candidate
This contribution proposes to replace the shift DV candidates with the depth-based DV (F0144) at the previous meeting. As planned in CE, this contribution evaluates the performance of not only the proposed candidate but also the shift DV candidates. The experiment illustrates that both the proposed candidate and the shift DV candidates provide the coding gain less than 0.1% in CTC and VSP off conditions, respectively, which is negligible. Therefore, it is recommended to remove the two shift DV candidates in the Merge mode list.
Note: The anchor in the table below is not CTC, but the CTC with the corresponding tools disabled. Then, the codec under comparison enables the two tools separately. However, the first row is not proposed any more, as it is believed to provide insufficient gain. Instead, it is proposed to removed the shift DV candidate which is also giving only marginal gain.
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