Image analysis – Histogram processing – For setting a threshold
Patent
1990-08-03
1991-05-28
Brinich, Stephen
Image analysis
Histogram processing
For setting a threshold
382 14, G06K 920
Patent
active
050201239
ABSTRACT:
A flexible technique that is robust in the presence of noise and distortion is disclosed for locating and utilizing fiducial markings to locate predetermined areas within an image. Initially, a set of candidate markings is determined, one marking from within each of a plurality of predesignated areas of a scanned image. Thereafter, an estimate of a set of image distortion factors relative to an ideally registered image of the same type as the scanned image is derived. Predicted locations for the fiducial markings are derived using this estimated set of image distortion factors. If the difference in location between the actual location of any candidate markings and its predicted location is greater than a predetermined threshold, at least one such candidate is removed from the set of candidate markings. The estimation and removal processes are repeated, utilizing the new current set of candidate fiducial markings until all remaining candidate markings are within a predetermined distance of their predicted locations. Predetermined areas within the scanned image can thereafter be accurately located by combining the known location of the area within an ideal image with the final estimated set of image distortion factors. The predicted location may be further improved by using a weighted average of the ideal versus the actual fiducial marking differences, to account for local non-linear variations.
REFERENCES:
patent: 4668982 (1987-05-01), Tinnerino
patent: 4773099 (1988-09-01), Bokser
patent: 4790028 (1988-12-01), Ramage
patent: 4842370 (1989-06-01), Brenner et al.
patent: 4893346 (1990-01-01), Bishop
patent: 4926491 (1990-05-01), Maeda et al.
AT&T Bell Laboratories
Brinich Stephen
Stafford Thomas
LandOfFree
Apparatus and method for image area identification does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for image area identification, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for image area identification will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-41660