Video and graphics system with square graphics pixels

Details Video and graphics system with square graphics pixels Video and graphics system with square graphics pixels

2006-06-06

2006-06-06

Wu, Xiao (Department: 2674)

Computer graphics processing and selective visual display system

Computer graphics processing

Graphic manipulation

C345S204000, C345S603000, C345S667000

Reexamination Certificate

active

07057627

ABSTRACT:
A video and graphics system provides square graphics pixels to blend images having 640×480 pixels, such as graphics images provided by some set top boxes and intended to be displayed at a 12.27 MHz display sample rate, with images having 704×480 pixels, such as ITU-R 601 compliant images such as NTSC SDTV images, having oblong pixels and displayed at a 13.5 MHz display sample rate. A sample rate converter including a multi-phase-multi-tap filter is used to generate square pixels. The multi-phase-multi-tap filter provides a good balance of sharpness, smoothness, anti-aliasing and reduced ringing. The multi-phase-multi-tap filter can also be used to convert images having 320×480 pixels to images having 704×480 pixels. The multi-tap filter can be used for scan rate conversion of graphics or video images for HDTV or SDTV applications.

REFERENCES:
patent: 5923385 (1999-07-01), Mills et al.
patent: 6144362 (2000-11-01), Kawai
patent: 2002/0106026 (2002-08-01), Demmer

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