System for allowing handwritten interaction with a computer
First Claim
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1. A system for enabling user interaction, the system including:
- a printer for printing print data on a form, the print data being at least partially indicative of a plurality of marks, each mark having a predetermined pattern common to all marks and coded data, the predetermined pattern including a rotationally invariant pattern; and
a sensing device for sensing the marks when moved relative to the form, for using the rotationally invariant pattern to correct for perspective distortion of the marks, for decoding the coded data of the marks, and for generating indicating data at least partially indicative of movement of the sensing device relative to the form.
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Abstract
A system for enabling user interaction is disclosed. The system includes a printer for printing print data on a form. The print data is indicative of a plurality of marks. Each mark has a predetermined pattern common to all marks and coded data. The predetermined pattern includes a rotationally invariant pattern. A sensing device is also included for sensing the marks when moved relative to the form, for using the rotationally invariant pattern to correct for perspective distortion of the marks, for decoding the coded data of the marks, and for generating indicating data indicative of movement of the sensing device relative to the form.
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Citations
12 Claims
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1. A system for enabling user interaction, the system including:
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a printer for printing print data on a form, the print data being at least partially indicative of a plurality of marks, each mark having a predetermined pattern common to all marks and coded data, the predetermined pattern including a rotationally invariant pattern; and a sensing device for sensing the marks when moved relative to the form, for using the rotationally invariant pattern to correct for perspective distortion of the marks, for decoding the coded data of the marks, and for generating indicating data at least partially indicative of movement of the sensing device relative to the form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification