Rate-distortion (RD) curves are two-dimensional, therefore comparing them is not straightforward. Bjøntegaard Delta-rate (BD-rate) criterion [1] can be used to compare rate-distortion curves.
References
[1] G. Bjøntegaard. “Calculation of average PSNR differences between RD-curves”. ITU-T Video Coding Experts group document VCEG-M33, April. 2001.
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