
Video Communications in UAV-Based Cyber-Physical Systems ◾ 263
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and partial reference are both utilized under the condition when the original videos are available.
In the case when the video codec is known we can use the no reference method to evaluate the
videos without the original video.
e traditional methods are to calculate the SNR and PSNR differences. PSNR is the most
widely used objective video evaluation metric. Whereas considering the nonlinearity of the human
vision system, sometimes the PSNR value is much different from human vision. Recently, some
more complex and accurate indexes are proposed, li ...