Method of determining shape error of free-form surface

G - Physics – 01 – B

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G01B 21/20 (2006.01) G06T 17/40 (2006.01)

Patent

CA 2288177

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.

On établit les courbures principales des positions correspondantes d'une surface incurvée S' d'objet et d'une surface incurvée de référence S et l'on classe les régions respectives suivant les trois catégories suivantes en fonction de la différence entre les courbures principales: (a) les régions où les deux courbures principales augmentent, (b) les régions où les deux courbures principales diminuent et (c) les régions où une courbure principale augmente alors que l'autre diminue. Ces régions (a), (b) et (c) sont considérées respectivement des monts, des vallées et des torsades et sont affichées sur un écran d'affichage au moyen de couleurs et de symboles différents. Il est ainsi possible d'identifier correctement les différentes régions des deux formes tridimensionnelles, de déterminer les causes d'erreurs du type courbe partielle, d'exprimer le degré de concordance entre les deux formes au moyen de valeurs numériques objectives, et d'établir une distinction entre les erreurs de forme même lorsque la forme de référence est compliquée.

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