In Figure 4,we showthe trend of the index PSNR obtained by the F-Transform method with respect to the distance (18) obtained using the GEFS and SEFS method. GEFS 是最大特征集SEFS最小特征集,PSNR是噪声信噪比,F-transform,是模糊变换, 请问应该先翻译哪一部分啊
先把句子主干找出来,然后再附上定语. [we show the trend of the index PSNR] [with respect to the distance]. 图表4展示了, 与距离相关的PSNR指数的趋势,该距离用GEFS和SEFS方法得出 (见第18例), 而PSNR指数用F-transform方法得出。