Apparatus and method for low angle interpolation

Details Apparatus and method for low angle interpolation Apparatus and method for low angle interpolation

2009-03-25

2011-12-06

Hsia, Sherrie (Department: 2422)

Television

Format conversion

Line doublers type

C348S450000

Reexamination Certificate

active

08072540

ABSTRACT:
An apparatus of low angle interpolation is disclosed, which includes a low angle calculation circuit, a direction decision circuit, a post-processing circuit, an interpolator and a line buffer. According to a counterclockwise operating matrix and a clockwise operating matrix whose shapes look like triangles, the invention calculates sum of absolute differences (SAD) for each specified angle to correctly detect edges, thereby minimizing jaggies and frequency alias.

REFERENCES:
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patent: 7973858 (2011-07-01), Pai et al.
patent: 2005/0163401 (2005-07-01), Park
patent: 2008/0074538 (2008-03-01), Chang
patent: 0550231 (1993-07-01), None
patent: 0687104 (1995-12-01), None
Salonen et al., “Edge Adaptive Interpolation for Scanning Rate Conversions,” Signal Processing of HDTV, Proceedings of the International Workshop on HDTV, Jan. 1, 1993, pp. 757-764, vol. 4.
Yong Ding et al., “A Novel De-Interlace Based on Spacio-Temporal Weight Adaptive and Edge-Directed Interpolation,” Signal Processing, The 8thInternational Conference on, IEEE, Jan. 1, 2006, all pages.

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