Image analysis – Image enhancement or restoration – Focus measuring or adjusting
Patent
1995-10-24
1997-06-24
Johns, Andrew
Image analysis
Image enhancement or restoration
Focus measuring or adjusting
356123, G06K 936
Patent
active
056424418
ABSTRACT:
A computer receives image data from a star-shaped optical target in the object plane and calculates angle-dependent boundary sharpness. The horizontal, x-direction, amplitude derivative and the vertical, y-direction, amplitude derivative are computed over a portion of each star pattern image from a Z panning sequence. A microscope slide stage, carrying the target, is moved vertically from a level just below where the target is in focus to a level just above where the target is in focus. For each small increment of vertical motion, Z panning, an image of the star pattern is captured for analysis. Computations are performed on the differentiated images to search for evidence of elongation of the point spread function and variation with stage Z position of the angle of long axis of such an out-of-round point spread function. The presence of a distorted point spread function that varies along the optical axis indicates astigmatism.
REFERENCES:
patent: 3562785 (1971-02-01), Craig
patent: 3602578 (1971-08-01), Tibbetts et al.
patent: 3713730 (1973-01-01), Kaplan
patent: 4113363 (1978-09-01), Humphrey
patent: 4127109 (1978-11-01), Fourney et al.
patent: 4282548 (1981-08-01), Plummer
patent: 4341953 (1982-07-01), Sakai et al.
patent: 4639588 (1987-01-01), Shinoda
patent: 4700298 (1987-10-01), Palcic et al.
patent: 4786166 (1988-11-01), Kroko
patent: 4908656 (1990-03-01), Suwa et al.
patent: 5300786 (1994-04-01), Brunner et al.
patent: 5303023 (1994-04-01), Portney et al.
patent: 5384656 (1995-01-01), Schwenker
patent: 5389858 (1995-02-01), Langner et al.
patent: 5393634 (1995-02-01), Maker et al.
Frost Keith L.
Hansen Kim J.
Lindow William C.
Phan Tuan
Riley James K.
Johns Andrew
Moffa, Esq. Emil
NeoPath, Inc.
Sun, Esq. Hans I.
LandOfFree
Separation apparatus and method for measuring focal plane does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Separation apparatus and method for measuring focal plane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Separation apparatus and method for measuring focal plane will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-154372