Page 93 - ITU Journal, ICT Discoveries, Volume 3, No. 1, June 2020 Special issue: The future of video and immersive media

ITU Journal: ICT Discoveries, Vol. 3(1), June 2020

of compressed video sequences employed in this study. [8] N. Ponomarenko, O. Eremeev, V. Lukin, K. Egiazarian,

Moreover, as noted in Sec.1.1, the per-block sensitivity and M. Carli, “Modified image visual quality metrics

weight of (5) or of (9) can be used to easily adapt for contrast change and mean shift accounting,” in

the quantization parameter (QP) in traditional coders Proc. CADSM, Polyana-Svalyava, pp. 305–311, 2011.
to the instantaneous input characteristics, without ha-
[9] P. Gupta, P. Srivastava, S. Bhardwaj, and V. Bhateja, “A
ving to rely on [13]–[15],[17]–[19],[39]. Specifically,
modified PSNR metric based on HVS for quality
assessment of color images,” in Proc. IEEE Int. Conf.

QP = QP − round 3 ∙ log (17) on Commun. & Industr. Applic., Kolkata, IN, Dec. 2011.

[10] P. Philippe, W. Hamidouche, J. Fournier, and J. Y.
can be used to XPSNR-optimize the quantization step-
Aubié, “AHG4: Subjective comparison of VVC and
size inside an HEVC or VVC encoder, initialized using a HEVC,” Joint Video Experts Team, doc. JVET-O0451,

per-frame constant QP , on a coding block basis. Aside

Gothenburg, SE, July 2019.
from further statistical evaluation using more datasets,
this beneficial aspect, along with the incorporation of [11] N. Sidaty, W. Hamidouche, P. Philippe, J. Fournier, and
chroma-component and/or high dynamic range (HDR) O. Deforges, “Compression Performance of the Ver-
statistics (see, e. g.,[43]) and multi-threaded operation, satile Video Coding: HD and UHD Visual Quality Mo-

will be the focus of future work on this VQA algorithm. nitoring,” in Proc. IEEE Picture Coding Symposium,
Ningbo, CN, Nov. 2019.
[12] Z. Li, “VMAF: The Journey Continues,” in Proc. Mile
9. ACKNOWLEDGMENT
High Video Workshop, Denver, 2019, link: http://mil
The authors thank Pierrick Philippe (formerly B-Com) ehigh.video/files/mhv2019/pdf/day1/1_08_Li.pdf.
for helping to calculate the VQA values on the VTM and
[13] S. Bosse, C. R. Helmrich, H. Schwarz, D. Marpe, and T.
HM coded videos of the comparative test published in Wiegand, “Perceptually optimized QP adaptation
[10],[11] and Sören Becker for assistance in the collec- and associated distortion measure,” doc. JVET-
tion of the correlation values and the creation of Fig. 4.
H0047, Macau, CN, Oct./Dec. 2017.
[14] C. R. Helmrich, H. Schwarz, D. Marpe, and T. Wie-
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