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Set the position, size, and enlargement ratio of the frame buffer window so that the display reference position (Pz ') and zoom point (Pz) overlap. In addition, any value can be specified for the magnification (FRX, FRY), and it is converted and set to a magnification that can be set by the LSI.
The conceptual diagram is shown below.

Figure 5.1 Display window and frame buffer window

The MPEG window control interface can realize the following visual effects with few parameters. The parameters to be operated when executing visual effects are shown below.

Table 5.1 Visual effects and control parameters 
 Visual effects 
 Parameters to control 
 Effects 
 Zoom 
 FRX, FRY 
 Fix the display window 
 Define and zoom the displayed image 
. 
 Scroll 
 FZX, FZY 
 Move left and right 
 up and down without changing. 
 move 
 DZX, DZY 
 Zoom point unchanged Move the display reference position to. 
 Peeping 
 DLX, DLY 
 Video display relative position While changing the 
, you can watch the frame buffer video 
. 
 wipe 
 DLX, DLY, DSX, DSY 
 Video The magnification of the 
 display window will change without changing the magnification. 
 Expand 
 DLX, DLY, DSX, DSY 
 FRX, FRY 
 The size of the display window 
 changes as the size of the video changes 
.

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