METHOD OF DISCRIMINATING SHAPE ERRORS OF FREE-FORM CURVED SURFACE

Title:

METHOD OF DISCRIMINATING SHAPE ERRORS OF FREE-FORM CURVED SURFACE

Document Type and Number:

WIPO Patent Application WO/1998/049524

Kind Code:

A1

Abstract:

The principal curvatures in the corresponding positions of an object curved surface S' and a reference curved surface S are determined and the respective regions are classified into the following three categories in accordance with the difference between the principal curvatures; i.e. (a) regions where both of the principal curvatures increase, (b) regions where both of the principal curvatures decrease, and (c) regions where one principal curvature increases while the other decreases. The regions (a), (b) and (c) are judged to be mount, valleys and twists respectively and are displayed by different symbols or colors on a display screen. Thus it has become possible to recognize the different regions of the two three-dimensional shapes properly, to find the causes of errors such as partial bend, to express the extent of agreement between the two shapes by objective numerical values, and to discriminate shape errors even if the reference shape is complicated.

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Inventors:

KASE KIWAMU (JP)
MAKINOUCHI AKITAKE (JP)
KONDO TETSUYA (JP)
MORI NAOMICHI (JP)

Application Number:

PCT/JP1998/001842

Publication Date:

November 05, 1998

Filing Date:

April 22, 1998

Export Citation:

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Assignee:

RIKAGAKU KENKYUSHO (JP)
AMADA METRECS CO (JP)
KASE KIWAMU (JP)
MAKINOUCHI AKITAKE (JP)
KONDO TETSUYA (JP)
MORI NAOMICHI (JP)

International Classes:

G01B21/20; G06T17/30; (IPC1-7): G01B21/20

Foreign References:

JPH04276513A

1992-10-01

Other References: