Simultaneous vertical spatial filtering and chroma conversion in video images
AssigneeInternational Business Machines Corporation
InventorsJames D. Greenfield, Agnes Y. Ngai, John M. Sutton, Edward F. Westermann
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Abstract
Simultaneous vertical spatial filtering and chrominance conversion is achieved with reduced data buffering and simplified filtering circuits by using a single filter stage and hybrid filter coefficients. Data latency is reduced and performance requirements are reduced while avoiding critical signal propagation paths. The filter and buffers are fully compatible with any scan format having consecutively presented lines of image data, including both progressive and interlaced scan formats.
Claims12
A method of pre-processing image data, said method including steps of
- applying luminance and chrominance data of consecutively presented lines of data to respective data inputs of a filter, and
- applying hybrid filter coefficients to said filter to concurrently obtain spatially filtered and chrominance converted data.
A pre-processing circuit for image data including
- a filter having inputs to receive luminance and chrominance data corresponding to consecutive image data lines, and
- means for applying hybrid filter coefficients to said filter such that spatially filtered and chrominance converted data are concurrently developed by said filter.
Dependencies are inferred from the claim text.