Readout system for dilatometers

Details Readout system for dilatometers Readout system for dilatometers

1991-05-29

1995-12-26

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

With light attenuation

356357, 374 55, G01B 1128, G01B 1102

Patent

active

054792614

ABSTRACT:
A method and apparatus for calculating the area of an image, including the steps of selecting an image and determining a first radial line segment from the center of the image. The second step is locating at least one local minima along the first radial line segment, the minima being located by measuring the average brightness for a region immediately adjacent to it. The darkest region of the image is followed through a plurality of angles theta covering 360 degrees about the center by finding the local minimum on a ruler which is closest to the local minimum of a radial line segment adjacent to the segment for angle theta -1. The area is determined by summing the areas of individual wedge shaped slices defined by theta and theta -1.

REFERENCES:
patent: 3804527 (1974-04-01), Baughn et al.
patent: 4463600 (1984-08-01), Hobbs et al.
patent: 4641971 (1987-02-01), Korth
patent: 4989980 (1991-02-01), Berg

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