Altera Video and Image Processing Suite - Manual (Page 122)

Chroma Resampler IP Core
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2015.05.04
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The Chroma Resampler IP core resamples video data to and from common sampling formats.
The human eye is more sensitive to brightness than tone. Taking advantage of this characteristic, video
transmitted in the Y’CbCr color space often subsamples the color components (Cb and Cr) to save on
data bandwidth.
The Chroma Resampler IP core allows you to change between 4:4:4, 4:2:2 and 4:2:0 sampling rates where:
• 4:4:4 specifies full resolution in planes 1, 2, and 3.
• 4:2:2 specifies full resolution in plane 1; half width resolution in planes 2 and 3.
• 4:2:0 specifies full resolution in plane 1; half width and height resolution in planes 2 and 3.
All modes of the Chroma Resampler IP core assume the chrominance (chroma) and luminance (luma)
samples are co-sited (their values are sampled at the same time).
• Horizontal resampling process supports nearest-neighbor and filtered algorithms.
• Vertical resampling process supports only the nearest-neighbor algorithm.
You can configure the Chroma Resampler IP core to change image size at run time using control packets.
Horizontal Resampling (4:2:2)
Horizontal resampling process supports nearest-neighbor and filtered algorithms.
Conversion from sampling rate 4:4:4 to 4:2:2 and back are scaling operations on the chroma channels.
This means that these operations are affected by some of the same issues as the Scaler II IP core. However,
because the scaling ratio is fixed as 2× up or 2× down, the Chroma Resampler IP core is highly optimized
for these cases.
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