Figure input system

• US 5,121,442 A
• Filed: 10/02/1991
• Issued: 06/09/1992
• Est. Priority Date: 09/03/1987
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Hirose, Hitoshi, Togawa, Fumio
• Primary Examiner(s): Moore, David K.
• Assistant Examiner(s): COUSO, YON JUNG
• Application Number:
  US07/769,582
• Time in Patent Office: 251 Days
• Field of Search: 382/13, 382/25, 382/26, 382/44, 382/23, 340/712, 340/709, 364/488, 364/491, 364/518, 178/18
• US Class Current: 382/189
• CPC Class Codes: G06F 3/033 Pointing devices displaced or positioned by the user , e.g. mice, trackballs, pens or joysticks; Accessories therefor digitisers characterised by the transducing means G06F3/041
• CPC Class Codes: G06V 30/1423 the instrument generating sequences of position coordinates corresponding to handwriting preprocessing or recognising digital ink G06V30/32
• CPC Class Codes: G06V 30/347 Sampling; Contour coding; Stroke extraction

Abstract

A figure input system includes an input device such as a digitizer through which coordinate data of points on a figure to be inputted are time-wise continuously received. These data are sampled sequentially at set time intervals and are analyzed in view of the kind of basic figure intended by the user such that geometrical characteristics and position data are extracted from the sampled data and a regular basic figure can be displayed on a display device.

Claims

1. A figure input system comprising

a coordinate input device,

a sampling means for sequentially sampling at specified time intervals coordinate data of a hand-drawn figure, said coordinate data being time-wise continuously inputted from said coordinate input device,

a storage means for storing coordinate data sequentially sampled by said sampling means,

a figure specifying means for allowing a user to manually specify the name of an intended kind of basic two-dimensional closed geometrical figure,

an extracting means for extracting from said coordinate data geometrical characteristics and position data for basic two-dimensional closed geometrical figures of a kind, the name of which has been specified through said specifying means, and

a figure generating means for codifying said inputted figure as a regular basic figure based on said geometrical characteristics and extracted by said extracting means and displaying said codified basic figure on a display device, wherein a basic two-dimensional closed geometrical figure of said intended kind as specified by said hand-drawn figure is displayed on said display device.

2. The figure input system of claim 1 wherein said extracting means includes a basic figure data memory storing data related to basic two-dimensional closed geometrical figures from which said intended kind of basic figure can be selected by said specifying means.

3. The figure input system of claim 1 wherein said extracting means calculates length and directions of vectors connecting points on said inputted figure inputted through said coordinate input device.

4. The figure input system of claim 1 wherein said coordinate input device includes a digitizer.

5. The figure input system of claim 1 wherein said coordinate input device includes a tablet having an on-off switch.