公开(公告)号：JPH08255259A

公开(公告)日：1996-10-01

申请号：JP19007995

申请日：1995-07-26

Applicant: DASSAULT SYS OF AMERICA

Inventor： FEENEY MARK A ,  CORN EDWARD T

IPC: G06F15/18 ,  G06F17/50 ,  G06N3/00 ,  G06T11/80 ,  G06T17/00

Abstract: PROBLEM TO BE SOLVED: To prepare a drawing path for satisfying an accurate standard from the drawing path (route) lacking a precise standard plotted by a drafting indicator. SOLUTION: This method is provided with a process for generating the group of indicator information elements for indicating the moving position of an indicator within the path lacking a prescribed precise standard, the process for generating the group of converted information elements for indicating a position in response to the indicator information elements, the process for adding an arithmetic operation to the converted group of the information elements by using a neural net and classifying the converted group in response to the arithmetic operation, the process for generating the feature of the group of the indicator information elements in response to classification and the process for determining the changed group of the information elements for indicating the position of a changed path not lacking the precise standard.

公开(公告)号：EP0697679A3

公开(公告)日：1998-07-01

申请号：EP95106103

申请日：1995-04-24

Applicant: DASSAULT SYS OF AMERICA

Inventor： FEENEY MARK A ,  CORN EDWARD T

IPC: G06F15/18 ,  G06F17/50 ,  G06N3/00 ,  G06T11/80 ,  G06T17/00

CPC classification number: G06K9/00416 ,  G06T11/203

Abstract: A computerized method of drawing provides sketching-type drawing capabilities in a computer-aided design (CAD) environment. Geometrical drawing parts or elements, sketched through a hand-controlled indicator and lacking in the precision criteria or standards associated with formal drawings, are recognized and interpreted as points, straight lines, open arcs, circles and ellipses. Delete and "areafill" symbols, similarly, are recognized and interpreted. The method also provides the capability to distinguish and interpret relatively complex, multiple-part or element strokes. This is done by determining break locations for the elements along the stroke, and by recognizing these elements before re-constituting a stroke meeting precision criteria. A variety of geometrical constraints which are important in a CAD environment, including coincidence, parallelism, tangency and relimitation, are also recognized and imposed. The recognizing of geometrical elements includes the use of pattern recognition and the use of a neural net. The determination of breaks incorporates the calculation of functions representative of changes in angle, of curvature, and of changes in slope, and the classification of information elements representative of locations, based on such calculations.