Method and apparatus for recognizing and performing handwritten calculations
DCFirst Claim
Patent Images
1. A calculator, comprising:
- (a) a display screen covered by a touch sensitive surface; and
(b) a processing circuit, coupled to the display screen and the touch sensitive surface, for recording movements of a pointing member across the touch sensitive surface of the display screen, for recognizing the recorded movements of the pointing member on the touch sensitive surface of the display screen as characters, for recognizing one or more mathematical expressions comprised of operands and operators by a relative placement of the characters, for displaying the mathematical expressions on the display screen, for performing calculations indicated by the operands and operators in the displayed mathematical expressions, and for displaying a result of the performed calculations on the display screen.
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Abstract
A pen-based circulator recognizes handwritten input. The calculator comprises a display simulating a sheet of paper, and a stylus simulating a pen. The user writes a calculation on the calculator as if it were a piece of scratch paper. The calculator uses handwriting recognition to identify the various elements of the calculation, performs the calculation, and then displays the result at an appropriate location.
174 Citations
19 Claims
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1. A calculator, comprising:
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(a) a display screen covered by a touch sensitive surface; and (b) a processing circuit, coupled to the display screen and the touch sensitive surface, for recording movements of a pointing member across the touch sensitive surface of the display screen, for recognizing the recorded movements of the pointing member on the touch sensitive surface of the display screen as characters, for recognizing one or more mathematical expressions comprised of operands and operators by a relative placement of the characters, for displaying the mathematical expressions on the display screen, for performing calculations indicated by the operands and operators in the displayed mathematical expressions, and for displaying a result of the performed calculations on the display screen.
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2. A calculator, comprising:
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(a) a display screen covered by a touch sensitive surface; (b) means for recognizing handwritten input traced across the touch sensitive surface of the display screen as characters; (c) means for recognizing a mathematical expression comprised of operators and operands from a relative placement of the characters, (d) means for displaying the mathematical expression on the display screen; (e) means for performing calculations indicated by the operators and operands in the displayed mathematical expression; and (f) means for displaying a result of the performed calculations on the display screen. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of performing calculations in a calculator having a display screen covered by a touch sensitive surface, and a processing circuit coupled to the touch sensitive surface and the display screen, the method comprising the steps of:
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(a) recording movements of a pointing element in the processing circuit, as the pointing element is traced across the touch sensitive surface of the display screen; (b) recognizing the recorded movements of the pointing element as characters in the processing circuit; (c) recognizing a mathematical expression comprised of operands and operators in the processing circuit from a relative placement of the characters; (d) displaying the mathematical expression on the display screen; (e) performing calculations indicated by the displayed mathematical expression in the processing circuit; and (f) displaying a result of the performed calculations on the display screen. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification