Resources Contact Us Home
Pointer-based computer system capable of aligning geometric figures

Image Number 13 for United States Patent #5621817.

An apparatus for recognizing shapes characterized by a stroke grouper receptive to a plurality of strokes formed on a screen of a pen-based computer system; a shape recognition engine receptive to a stroke group produced by the stroke grouper; and a knowledge base coupled to the shape recognition engine, where the knowledge base includes, at a minimum, knowledge concerning closed polygons and closed curves. Preferably, the closed curves of the knowledge base include both circles and ellipses. A method for recognizing digitized shapes in a computer system includes the steps of receiving at least one user-initiated stroke; grouping the user-initiated stroke with related strokes to form a stroke group; and analyzing the stroke group to make a best-guess shape represented by the stroke group. Preferably, the method also looks for other shapes which are related to the best-guess shape and modifying at least one of the location, size, or shape of the best-guess shape to conform with the other shapes. The strokes are typically grouped when they are related in time, or space, or in both time and space. A method for recognizing and forming shapes includes the steps of: creating a live group including at least one live stroke; characterizing shape sides from the live group, where a shape side is either straight or curved; forming a polygon from the shape sides if all the shape sides are straight; forming an ellipse from the shape sides if all the shape sides are curved; and forming a composite curve from the shape sides if the shape sides are a mixture of straight sides and curved sides. The step of characterizing shape sides preferably includes the steps of: finding kinks in the live group; defining shape sides as segments between the kinks; and determining whether the shape sides are straight or curved.

  Recently Added Patents
Method and apparatus for idling a network connection
Transmit phase control for the echo cancel based full duplex transmission system
Detection of nucleic acid sequence differences using the ligase detection reaction with addressable arrays
Systems and methods for location aware access control management
High linearity mixer using a 33% duty cycle clock for unwanted harmonic suppression
Array substrate for liquid crystal display device and method of fabricating the same
Eventually-consistent data stream consolidation
  Randomly Featured Patents
Profiled element coated with an aqueous emulsion or dispersion
Cherub holding bowl lawn ornament
Antenna mounting to a rotor antenna having radial and axial air bearings
Fluid suspension freezer and method
Substituted pyrrolo[2,3-d]pyrimidine as a protein kinase B inhibitor
Soluble coffee beverage product
Article holder
Method of fabricating self-aligned planarized well structures
Secure electronic forms permitting layout revision
Drip irrigation tape and method of manufacture