Nonlinear edge-enhancement filter

Image analysis – Image enhancement or restoration – Edge or contour enhancement

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C382S252000, C382S260000, C382S269000, C358S003260, C358S003270, C358S003050

Reexamination Certificate

active

06873741

ABSTRACT:
Methods and apparatus for digital data array edge enhancement are disclosed. A local data window containing a data sample s is selected. Minimum and maximum sample values, max and min, are located within the window, and an edge deflection value ed is defined to have a value between max and min. A diffusion quantity is then calculated to move the value of s towards max, if s is greater than ed, or towards min, if s is smaller than ed. This approach has advantages over gradient-based edge-enhancement, including simplicity, convergence speed, and stability.

REFERENCES:
patent: 5644513 (1997-07-01), Rudin et al.
patent: 5757979 (1998-05-01), Hongo et al.
patent: 5787208 (1998-07-01), Oh et al.
patent: 5790692 (1998-08-01), Price et al.
patent: 5819035 (1998-10-01), Devaney et al.
patent: 5937090 (1999-08-01), Kim
patent: 6028646 (2000-02-01), Jeong et al.
patent: 6362579 (2002-03-01), Heizmann et al.
patent: 6774943 (2004-08-01), Kao et al.
Ilya Pollak, Alan S. Willsky, and Hamid Krim, “Image Segmentation and Edge Enhancement with Stabilized Inverse Diffusion Equations”, IEEE Transactions on Image Processing, vol. XX, No. Y, 1999, pp 1-12.
Stanley Osher and Leonid I. Rudin, “Feature-Oriented Image Enhancement Using Shock Filters”, Siam Journal of Numerical Analysis, vol. 27, No. 4, Aug. 1990, pp 919-940.
Pietro Perona and Jitendra Malik, “Scale-Space and Edge Detection Using Anisotropic Diffusion”, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 12, No. 7, Jul. 1990, pp 629-639.
Giovanni Ramponi and Andrea Polesel, “A Rational Unsharp Masking Technique”, Journal of Electronic Imaging, vol. 7, No. 2, Apr. 1998, pp 333-338.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Nonlinear edge-enhancement filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Nonlinear edge-enhancement filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonlinear edge-enhancement filter will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3429673

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.