Chrominance transition corrector
AssigneeTektronix, Inc.
InventorBruce J. Penney
Life of this patent
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Abstract
A chrominance transition corrector for restoring chrominance transitions after they have been degraded by a limited bandwidth channel converts input luminance and chrominance components, which represent a video image, from the time to the frequency domain. Correction coefficients are determined from a low frequency portion of the converted luminance component and the converted chrominance components. Corrected high frequency portions of the chrominance components are generated from the correction coefficients and a high frequency portion of the converted luminance component. The resulting converted and corrected high frequency portion of the chrominance components are then converted back to the time domain to produce chrominance output components, the chrominance transitions having been corrected.
Claims6
A chrominance transition corrector comprising:
- first means for converting a luminance and two bandwidth limited chrominance components representing a video image from a time to a frequency domain, the converted luminance component being separated into a high and a low frequency portion;
- means for determining a pair of chrominance correction coefficients from the low frequency luminance portion and the converted chrominance components;
- means for generating from the correction coefficients and the high frequency luminance portion corrected high frequency chrominance components;
- and
- second means for converting the converted and corrected high frequency chrominance components to the time domain to produce corresponding chrominance output components, the chrominance output components being transition corrected.
Dependencies are inferred from the claim text.