Accom ASWR8150, Technical Manual

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the main key input for the 4:2:2 part and the external mask input for the
0:2:2 part. After you complete the color correction, the video is
downsampled and output as 4:2:2 video.
Key/Border Processor [4]
Inputs
The Key/Border processors have a primary key extraction input (Key 1,
Key 2, and DSK Key) and an external mask input (Mask 1, Mask 2, and
DSK Mask). Selecting the optional 4:4:4 chroma key extraction mode
provides the external mask input with an additional sample resolution
path (4:2:2 + 0:2:2 = 4:4:4).
Outputs
The Key and Border processors have an extracted key output that feeds
their respective Mix/Effect or DSK keyer (Key 1, Key 2, DSK), and an
associated suppression signal that feeds the optional Color Corrector
(Suppress 1, Suppress 2, Suppress DSK).
Key Processing
All keyers are identical, and offer luminance and chroma key extraction.
Chroma Key Extraction
The 8150 features advanced chroma key modes, including 4:2:2 and
optional 4:4:4 high bandwidth modes. Conventional chroma key
controls appear on the left in Figure 1-6, below. The 8150 has advanced
chroma key circuitry that lets you precisely define the boundaries of the
chroma key. These advanced chroma key controls appear on the right
Figure 1-6 Conventional vs. 8150 Chroma Key Extraction
Video Processing Functional Description 8150 Technical Guide
1-12
Introduction
9100-0212-04 - May 2000