tools: add dump_ciede2000.py color metric

Multimedia / Daala - David Michael Barr [rr-dav.id.au] - 2 December 2015 16:14 UTC

Add a basic Python prototype for dumping the mean color distance between pixels in dB. The parameters for CIEDE2000 are from this paper: "Color Image Quality Assessment Based on CIEDE2000" Yang Yang, Jun Ming and Nenghai Yu, 2012 http://dx.doi.org/10.1155/2012/273723 That paper aligns with subjective scores by applying a log base 2 scale to the mean color distance. For consistency with other metrics, we apply a scale of 20 * log10(mean(dE))

7befe43 tools: add dump_ciede2000.py color metric
tools/dump_ciede2000.py | 81 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 81 insertions(+)

Upstream: git.xiph.org

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