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Moreover, Frame DCT or Field DCT can be chosen adaptively according to the
video format as shown in Fig. 28.
bottom field
top field
Frame DCT
Field DCT
MPEG-2 DCT can adaptively performed with frame or field structure block.
Fig. 28
Frame/field Adaptive DCT
Furthermore, scanning order can be switched adaptively according to
frame/field DCT transform as shown in Fig. 29.
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(a) zigzag scan
(b) alternate scan
Fig. 29
Adaptive scan change
