Edge enhancement method and apparatus in digital image...

Details Edge enhancement method and apparatus in digital image... Edge enhancement method and apparatus in digital image...

2005-04-05

2005-04-05

Mehta, Bhavesh M. (Department: 2625)

Image analysis

Image enhancement or restoration

Edge or contour enhancement

C382S252000, C382S269000, C358S003260, C358S003270, C358S463000

Reexamination Certificate

active

06876778

ABSTRACT:
An edge enhancement method and an edge enhancement apparatus in digital image scalar-up circuit are provided. A band-pass filtering process is performed to an input image pixel in multiple directions to generate multiple sum-of-border values which are summed up to generate an overall sum-of-border value. A first gain and a second gain are provided according to the overall sum-of-border value. A high-pass filtering process and a low-pass filtering process are performed to the input image pixel to obtain border and plain components which are multiplied by the first gain and second gain, respectively. The gained border component and plain component are summed and added to the original pixel to obtain a new pixel.

REFERENCES:
patent: 4945502 (1990-07-01), Kwon et al.
patent: 5687253 (1997-11-01), Huttenlocher et al.
patent: 6421468 (2002-07-01), Ratnakar et al.
patent: 6807304 (2004-10-01), Loce et al.

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