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148                    Chapter  6.  Multiple-Reference  motion  Estimation Techniques


                                           QSIF Akiyo
                              47
                                                          M=1
                                                          M=2
                              46                          M=5
                                                          M=10
                              45                          M=50
                             PSNR Y  (dB)   43
                              44
                              42
                              41
                              40
                              39
                              38
                                 1        2        3       4
                                           Frame skip
                                           (a) AKIYO
                                           QSIF Foreman
                              34
                                                           M=1
                                                           M=2
                              33                           M=5
                                                           M=10
                                                           M=50
                              32
                             PSNR Y  (dB)   31
                              30
                              29
                              28
                              27
                              26
                                 1        2        3       4
                                            Frame skip
                                          (b) FOREMAN
                                           QSIF Table Tennis
                             33
                                                           M=1
                             32.5                          M=2
                                                           M=5
                                                           M=10
                             32                            M=50
                             31.5
                            PSNR Y  (dB)   30.5
                             31
                             30
                             29.5
                             29
                             28.5
                             28
                                 1        2        3       4
                                            Frame skip
                                        (c) TABLE TENNIS
               Figure 6.5:  Prediction  quality of  LTM-MCP with di&erent  memory  sizes and frame skips
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