JEG HEVC DB analysis

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Agreement analysis between pairs

Comparing two processed video sequences (PVS) originating from the same uncompressed video by means of PSNR, SSIM, VIF, it is possible that:

  • all metrics agree on which sequence has the best quality;
  • one of the three metrics gives another indication.

In the latter case, considering all these pairs of sequences, the value of the other two metrics is shown in the graph below. In particular, if x is SSIM and y is VIF, it means that the metric which disagrees is the third one, i.e., PSNR. The graph shows the number of pairs that, for the specific SSIM and VIF difference, disagrees on the PSNR.

src01:

Fullimage seq01.png

src02:

Fullimage seq02.png

src03:

Fullimage seq03.png

src04:

Fullimage seq04.png

src05:

Fullimage seq05.png

src06:

Fullimage seq06.png

src07:

Fullimage seq07.png

src08:

Fullimage seq08.png

src09:

Fullimage seq09.png

src10:

Fullimage seq10.png

All together:

Fullimage.png

Prediction consistency

Selecting a given percentile value it is possible to identify a reasonable threshold for the prediction consistency of the measure with respect to the two others. Values are strongly dependent on the sequence and also on the cause of disagreement (i.e., the measure that disagrees) within the same sequence.

95 percentile:

Graph hist percentile99.png

99 percentile:

Graph hist percentile99.png
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