Processing system with graphics data prescaling

Details Processing system with graphics data prescaling Processing system with graphics data prescaling

1996-10-11

1999-09-14

Shah, Kamini

Data processing: measuring, calibrating, or testing

Measurement system

Measured signal processing

709214, 348391, 348396, H04N 974

Patent

active

059536918

ABSTRACT:
A method and apparatus for prescaling graphics data for use in a graphics overlay operating mode of a set top box processing system. RGB pixel data for a given pixel are first converted to luminance and chrominance data for that pixel. The luminance and chrominance data are then prescaled by a blending value associated with the given pixel. An interpolation operation is performed on the luminance and chrominance data as well as on the blending value for the given pixel using corresponding luminance and chrominance data and blending values for at least one other pixel in the stream. This interpolation may include operations such as horizontal filtering and may also include chroma filtering to convert the luminance and chrominance data into a 4:2:2 chrominance format compatible with MPEG-2 video. The interpolation operation produces interpolated luminance and chrominance data and an interpolated blending value for the given pixel. A video signal to be combined with the graphics data is then scaled using the interpolated blending value. The scaled video signal is combined with the interpolated luminance and chrominance data for the given pixel to provide a combined video/graphics signal suitable for display.

REFERENCES:
patent: 5323232 (1994-06-01), Otaka et al.
patent: 5506604 (1996-04-01), Nally et al.
patent: 5646696 (1997-07-01), Sprague

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