Vizio VM60P HDTV10A Service Manual page 57

DCDI by faroudja video processing
The FLI8668 dual zoom/shrink scalers use an advanced scaling technique proprietary to
Genesis Microchip Inc. They provide simultaneous high-quality scaling of real-time video and
graphics images on both channels. An input field/frame is scalable arbitrarily in both the
vertical and horizontal dimensions.
The input image is separated into three zones horizontally; left, center, and right. The center
zone is scaled at a programmable fixed ratio. The left and right zones have a programmable
changing scale factor that changes from left to right: see Figure 8-12 Non-linear Scaling of a
4:3 to 16:9 aspect ratio conversion. The scale ratio change can either be linear or parabolic.
Figure 8-12 Non-linear Scaling of a 4:3 to 16:9 aspect ratio conversion
A conversion for 16:9 to 4:3 aspect ratio would use the same method with an inverse
parabolic ratio for the scale factor of the left and right zones.
CONFIDENTIAL – DO NOT COPY Page 8-12
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