4×4 pixel-based edge detection and edge enhancement...

Details 4×4 pixel-based edge detection and edge enhancement... 4×4 pixel-based edge detection and edge enhancement...

2007-04-03

2007-04-03

Couso, Yon J. (Department: 2624)

Image analysis

Image enhancement or restoration

Edge or contour enhancement

C382S298000

Reexamination Certificate

active

10390139

ABSTRACT:
A digital image upscaling system enhances the visual quality of enlarged images by detecting diagonal edges and applying an appropriate scaling algorithm, such as a rotated bilinear scaling process, to output pixels associated with those edges. The rotated bilinear scaling process involves detecting diagonal edges and specifying a new frame of reference rotated 45° from the original frame of reference, and then selecting a rotated pixel set based on the new frame of reference. Bilinear interpolation in the new frame of reference using the rotated pixel set provides improved pixel data for the output pixel. Output pixels found not to be associated with diagonal edges are processed using standard bilinear interpolation.

REFERENCES:
patent: 5054100 (1991-10-01), Tai
patent: 6943805 (2005-09-01), Snyder et al.
patent: 2003/0053702 (2003-03-01), Hu
patent: 2003/0076515 (2003-04-01), Schuppan
patent: 2003/0189579 (2003-10-01), Pope
patent: 2004/0190792 (2004-09-01), Slavin
patent: 2006/0093232 (2006-05-01), Yang et al.

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