Adaptive scaling using a programmable video engine

Details Adaptive scaling using a programmable video engine Adaptive scaling using a programmable video engine

2005-09-12

2009-11-17

Amini, Javid A (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Graphic manipulation

C345S601000, C345S547000, C345S660000, C382S260000

Reexamination Certificate

active

07619639

ABSTRACT:
The invention pertains to an adaptive scaling technique. A look-up table of optimized filter coefficients is used to configure a multi-tap filter when scaling a video image. The look-up table reflects the scaling between standardized video source (input) resolutions and video display (output) resolutions. When an actual scaling factor does not correspond to an optimized operating point, a device driver determines which two scaling factors reflected in the look-up table are closest to the actual scaling factor. A set of interpolated filter coefficients for the multi-tap filter is then generated from the optimized filter coefficients associated with the two closest scaling factors. One advantage of the disclosed technique is that scaling operations are performed using filter coefficients interpolated from filter coefficients optimized for two similar scaling operations. Thus, the technique provides more precise filtering relative to prior art designs, resulting in higher-quality scaled video images.

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