Character recognition device

• US 4,771,268 A
• Filed: 12/04/1987
• Issued: 09/13/1988
• Est. Priority Date: 12/27/1982
• Status: Expired due to Term

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Sone, Hironao, Suetaka, Hiroyuki
• Primary Examiner(s): Curtis, Marshall M.
• Assistant Examiner(s): FATAHI YAR, MAHMOUD
• Application Number:
  US07/132,623
• Time in Patent Office: 284 Days
• Field of Search: 340/365 C, 340/365 R, 340/365 S, 340/711, 340/712, 340/693, 340/688, 382/3, 382/10, 382/13, 382/21, 382/59
• US Class Current: 341/22
• CPC Class Codes: G06V 30/10 Character recognition
• CPC Class Codes: G06V 30/142 using hand-held instruments; Constructional details of the instruments
• CPC Class Codes: G06V 30/1823 using vector-coding

Abstract

A character recognition device has an input section having a plurality of touch electrodes. When the human body contacts at least two of the touch electrodes of the plurality of touch electrodes, the contacting capacity components of the touch electrodes are detected by a capacity component detection section. The contacting central point coordinates of the touch electrodes are calculated by calculation sections from the contacting capacity components of the touch electrode thus detected. The character hand-written on the plurality of touch electrodes is recognized as a character by character recognition sections, from the contacting central point coordinates calculated by the calculating sections.

Claims

1. A method of recognizing a character finger-traced on a plurality of touch responsive electrodes, comprising:

detecting values of touch capacitances of at least two of said touch responsive electrodes which are touched simultaneously by a person'"'"'s finger;

a first step of storing the value of each touch capacitance detected in said detecting step;

calculating central contacting point data based on said stored values of the touch capacitances of at least two of said touch responsive electrodes, for thereby obtaining any one of at least three different central contacting point data between at least two of said touch responsive electrodes in addition to actuation of individual electrodes the touch capacitances of which were stored in said first storing step;

a second step of storing the central contacting point data obtained in said calculating step;

repeating said detecting step, said first storing step, said calculating step and said second storing step while said person'"'"'s finger is tracing on said plurality of touch responsive electrodes, thereby obtaining plural items of central contacting point data which are greater in number than those of said touch responsive electrodes which are finger-traced; and

recognizing a finger-traced character based on said plural items of central contacting point data obtained by said repeating step.

2. The method of claim 1, wherein said character recognizing step includes the steps of:

obtaining vector rows of said finger-traced character from said plural items of central contacting point data;

comparing said obtained vector rows with reference vector rows of a plurality of characters, which are pre-stored; and

producing character data corresponding to those vector rows which are detected to coincide with said reference vector rows in said comparing step.

3. The method of claim 2, wherein said vector-row obtaining step includes the steps of:

obtaining length data of each stroke of said finger-traced character based on said plural items of central contacting point data;

dividing said length data equally into sub-length data; and

obtaining vector rows of said sub-length data.

4. The method of claim 1, wherein said central contacting point data calculating step includes the step of obtaining central contacting point data, using the largest contacted touch capacitance component among said contacted touch capacitance components of at least two touch responsive electrodes, which have been stored in said touch-capacitance component detecting step, and a contacted capacitance component of that touch responsive electrode which is adjacent to the touch responsive electrode having said largest contacted capacitance component.

5. The method of claim 1, including arranging said plurality of touch responsive electrodes in a matrix form.

6. The method of claim 1, further comprising the steps of:

storing character data representing said character recognized in said character recognizing step;

counting reference signals to obtain time data;

storing alarm time data in an alarm time memory; and

displaying said stored character data when said time data obtained in said counting step accords with the alarm time data stored in the alarm time memory.