Method of and apparatus for processing image signal

Details Method of and apparatus for processing image signal Method of and apparatus for processing image signal

1989-10-18

1991-09-17

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 22, 382 50, 358166, 358447, 328135, G06K 900

Patent

active

050502239

ABSTRACT:
A new image (S'ij) is generated from an image signal (Sij) by determining whether the configuration of the distribution of the image signal (Sij) at a point of interest (i, j) is upwardly convex, or a downwardly convex, or otherwise, employing, as the new image signal (S'ij), the original image signal (Sij) at the point of interest (i, j) if the configuration is upwardly convex or downwardly convex, and employing, as the new image signal (S'ij), an unsharp signal (Uij) if the configuration is otherwise. A differential signal (Sij-Uij), or an absolute signal .vertline.Sij Uij.vertline., or a square signal ((Sij-Uij).sup.2), or a Laplacian signal (.gradient..sup.2 Sij) is compared with a threshold signal (T) to determine whether the configuration of the distribution of the image signal (Sij) at a point of interest (i, j) is upwardly convex, or a downwardly convex, or otherwise. The unsharp signal (Uij) comprises an average signal (Uaveij) or a median signal (Umedij) in a region including the point of interest (i, j). A sharpness emphasizing signal (S*ij) is calculated from the new image signal (S'ij) and the unsharp signal (Uij) according to the equation:

REFERENCES:
patent: 3920889 (1975-11-01), Conner
patent: 4081836 (1978-03-01), Skinner
patent: 4918528 (1990-04-01), Oohashi
patent: 4953114 (1990-08-01), Sato

Affiliated with

Also associated with

Rating

Method of and apparatus for processing image signal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of and apparatus for processing image signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for processing image signal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1923696