Page 89 - Video Coding for Mobile Communications Efficiency, Complexity, and Resilience
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66                                      Chapter 3.  Video Coding:  Standards






                          I 1      B 2      P 3      B 4      P 5





                                     (a) Temporal scalability






                        Enhancement    EI         EP         EP
                           Layer







                                        I          P          P
                             Base
                            Layer




                                       (b) SNR scalability






                        Enhancement    EI         EP         EP
                           Layer







                                        I          P          P
                             Base
                            Layer

                                      (c) spatial scalability
                        Figure  3.6:  Temporal, SNR,  and spatial scalability  in H.263+
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