SCENE 

 A 



SCENE 

 B 



PLANAR 



18.7 DB 



MAX 21.0 DB 



SCENE 

 C 



PLANAR 



10.3 DB 



MAX 12.5 DB 



Fig. 18 — Three pictures showing ihe appearance of the error signal when using 

 "planar" prediction. Note the absence of horizontal and vertical contours. 



782 



