Image analysis – Histogram processing – For setting a threshold
Patent
1991-02-07
1992-10-27
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
356379, 364564, G06K 900, G01B 1128
Patent
active
051596431
ABSTRACT:
A pattern dimension measuring method for measuring the dimension of a measuring portion of a pattern of a specimen placed on a specimen stage by controlling a deflector of a scan type electron microscope capable of setting a desired inclination angle of the specimen stage a lens barrel, applying an electron beam to the measuring portion of the specimen, and image processing a secondary electron signal from the measuring portion, the method comprising: a first step of calculating the distance between top edges of the measuring portion of the pattern by image processing the secondary electron signal when the electron beam is applied to the measuring portion at an inclination angle of zero; a second step of obtaining the number of pixels at a taper portion of the measuring portion of the pattern by image processing the secondary electron signal when the electron beam is applied to the measuring portion at a first predetermined inclination angle which allows to observe the bottom edges; a third step of obtaining the number of pixels at the taper portion by image processing the secondary electron signal when the electron beam is applied to the measuring portion at a second predetermined inclination angle different from the first inclination angle which allows to observe the bottom edges; a fourth step of calculating the taper angle and height of the pattern in accordance with the numbers of pixels of the taper portion obtained at the second and third steps and the first and second predetermined inclination angles; and a fifth step of calculating the distance between the bottom edges of the pattern and the difference ratio between the top edge and bottom edge distances in accordance with the results calculated at the fourth step.
REFERENCES:
patent: 4326252 (1982-04-01), Kohno et al.
patent: 4406545 (1983-09-01), Montone et al.
patent: 4767212 (1988-08-01), Kitahashi et al.
Kaga Yasuhiro
Komatsu Fumio
Boudreau Leo H.
Kabushiki Kaisha Toshiba
Kelley Christopher
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