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Silicon Image, Inc.
Scan Plus v2 User Manual
19
Figure 4: System Block Diagram
Video Processing
All of the processing steps in the signal chain between your video source and the display
influence the quality of the image.
The following are brief descriptions of the series of steps shown in Figure 4.
1. A signal is generated by a source (DVD player, Laser Disc, VCR, Cable Box, DSS Receiver…)
2. The signal is converted from analog to digital.
3. The digital video signal is decoded from NTSC composite or S-Video (Y/C) to its basic
components of Y, Cr and Cb.
4. The component signal is converted from interlace to progressive by the SiI502 chip.
5. The progressive signal is converted back to analog RGB or Y-Pb-Pr and sent over a cable to
the display.
The iScan Plus v2 processes steps 2, 3, 4, and 5, but the final quality of the displayed image
depends both on the quality of the source and the display device.
Video
Source
Decoding
NTSC to
Component
Deinterlacing
480i to
480p
6L,
&KLS
Display
or
Projector
Analog to
Digital
Conversion
iScan Plus V2
Digital to
Analog
Conversion