Method for processing three-dimensional shape data

Details Method for processing three-dimensional shape data Method for processing three-dimensional shape data

1994-07-22

1997-09-16

Razavi, Michael T.

Image analysis

Image compression or coding

Contour or chain coding

345442, G06T 530

Patent

active

056688946

ABSTRACT:
A method for processing three-dimensional shape data includes steps of obtaining a plurality of point data along a surface of an object having a three-dimensional shape; taking out a point data from the obtained point data to be processed, approximating each specified number of point data in the to-be-processed point data adjacent the taken-out point data by a polynomial and then finding two unit vectors at the taken-out point data; finding an opening angle defined between the two found unit vectors; comparing the found opening angle with a predetermined threshold value of the opening angle, determining whether or not the found opening angle is not larger than the threshold value, and thinning the taken-out point data when the found opening angle is larger than the threshold value and not storing the taken-out point data in a storage unit, and leaving the taken-out point data without the thinning when the found opening angle is not larger than the threshold value and storing the taken-out point data in the storage unit.

REFERENCES:
patent: 4503493 (1985-03-01), Burkhardt et al.
patent: 4627734 (1986-12-01), Rioux
patent: 4771474 (1988-09-01), Takashima et al.
patent: 4787748 (1988-11-01), Rioux
patent: 5287441 (1994-02-01), Nakamura
Kyoritsu Shuppan kabushiki Kaisha, "The Basic and Application of the Three Dimensional CAD", Sect. 4.6, 4.6.1, p. 57, Hiroshi Toriya et al., Feb. 25, 1991.

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