CALCULATOR AND COMPUTER-READABLE MEDIUM

• US 20100231597A1
• Filed: 03/09/2010
• Published: 09/16/2010
• Est. Priority Date: 03/12/2009
• Status: Active Grant

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: YOSHIZAWA, Hiroaki
• Granted Patent: US 8,619,045 B2
• Time in Patent Office: Days
• US Class Current: 345/441
• CPC Class Codes: G06F 15/025 adapted to a specific application
• CPC Class Codes: G06V 30/373 using a special pattern or subpattern alphabet
• CPC Class Codes: G06V 30/387 using human interaction, e.g. selection of the best displayed recognition candidate

Abstract

A calculator is provided. The calculator includes: a display unit having a touch panel; a recognition unit configured to: (i) recognize a numerical expression which is handwritten on the touch panel; (ii) convert the handwritten numerical expression in a text format; and (iii) display the text-converted numerical expression on the display unit; and an erasing unit configured to: if a part of the text-converted numerical expression is erroneously recognized and the erroneously-recognized part is specified, (i) erase the erroneously-recognized part and a part of the handwritten numerical expression corresponding to the erroneously recognized part. If information is handwritten again in the erased part of the handwritten numerical expression, the recognition unit recognizes the handwritten information again, and then the erroneously-recognized part of the text-converted numerical expression is corrected.

Claims

1. A calculator comprising:

a display unit having a touch panel;

a recognition unit configured to;

(i) recognize a numerical expression which is handwritten on the touch panel;

(ii) convert the handwritten numerical expression in a text format; and

(iii) display the text-converted numerical expression on the display unit; and

an erasing unit configured to;

if a part of the text-converted numerical expression is erroneously recognized and the erroneously-recognized part is specified,

(i) erase the erroneously-recognized part and a part of the handwritten numerical expression corresponding to the erroneously recognized part,

wherein if information is handwritten again in the erased part of the handwritten numerical expression, the recognition unit recognizes the handwritten information again, and then the erroneously-recognized part of the text-converted numerical expression is corrected.

2. The calculator according to claim 1, further comprising:

an automatic input unit configured to;

if the recognition unit recognizes the handwritten numerical expression as a certain function,

(i) add an item for the certain function into the handwritten numerical expression and the text-converted numerical expression.

3. The calculator according to claim 1, further comprising:

an input candidate display unit configured to;

if the recognition unit recognizes the handwritten numerical expression as a certain function,

(i) display selective input candidates for the certain function on the display unit.

4. The calculator according to claim 3, further comprising:

a candidate input unit configured to;

if at least one candidate of the selective input candidates is specified using a touch pen,

(i) add the specified candidate into the handwritten numerical expression and the text-converted numerical expression.

5. A computer readable medium storing a program for causing the computer to perform operations comprising:

(a) recognizing a numerical expression which is handwritten on a touch panel;

(b) converting the handwritten numerical expression in a text format;

(c) displaying the text-converted numerical expression on a display unit;

if a part of the text-converted numerical expression is erroneously recognized,

(d) erasing the erroneously-recognized part and a part of the handwritten numerical expression corresponding to the erroneously recognized part;

(e) recognizing information which is handwritten again in the erased part of the handwritten numerical expression; and

(f) correcting the erroneously-recognized part of the text-converted numerical expression.

6. A calculator comprising:

a display unit having a touch panel; and

a processor which performs operation comprising;

(a) recognizing a numerical expression which is handwritten on a touch panel;

(b) converting the handwritten numerical expression in a text format;

(c) displaying the text-converted numerical expression on a display unit;

if a part of the text-converted numerical expression is erroneously recognized,

(d) erasing the erroneously-recognized part and a part of the handwritten numerical expression corresponding to the erroneously recognized part;

(e) recognizing information which is handwritten again in the erased part of the handwritten numerical expression; and

(f) correcting the erroneously-recognized part of the text-converted numerical expression.

7. The calculator according to claim 6, wherein the operation performed by the processor further comprises:

if the handwritten numerical expression is recognized as a certain function,

(g) adding an item for the certain function into the handwritten numerical expression and the text-converted numerical expression.

8. The calculator according to claim 6, wherein the operation performed by the processor further comprises:

if the handwritten numerical expression is recognized as a certain function,

(h) displaying selective input candidates for the certain function on the display unit.

9. The calculator according to claim 8, wherein the operation performed by the processor further comprises:

if at least one candidate of the selective input candidates is specified using a touch pen,

(i) adding the specified candidate into the handwritten numerical expression and the text-converted numerical expression.