Systems and methods for digital pen stroke correction

• US 7,502,509 B2
• Filed: 05/11/2007
• Issued: 03/10/2009
• Est. Priority Date: 05/12/2006
• Status: Expired due to Fees

• Current Assignee: Velosum, Inc.
• Original Assignee: Velosum, Inc.
• Inventors: Le, Tuan Van, Sheets, Rodney L.
• Primary Examiner(s): Carter; Aaron W
• Application Number:
  US11/747,401
• Publication Number:
  US 20070263946A1
• Time in Patent Office: 669 Days
• Field of Search: 382181-189, 345156-184, 715/863
• US Class Current: 382/186
• CPC Class Codes: G06V 30/1423 the instrument generating sequences of position coordinates corresponding to handwriting preprocessing or recognising digital ink G06V30/32

Abstract

Systems and methods are provided for correcting digital pen strokes written on a paper form using a digital pen. In one embodiment, a stroke collection file includes sets of coordinates corresponding to respective pen strokes written on the paper form including a mistake stroke that a user of the pen desires to correct and a removal stroke written through the mistake stroke using the digital pen. In one embodiment, the removal stroke includes a horizontal zigzag pattern having at least one horizontal extend further to the left and further to the right of the mistake stroke. In one embodiment, coordinates corresponding to the mistake stroke and the removal stroke are deleted from the stroke collection file. The stroke collection file may also include coordinates for a third pen stroke intended to replace the mistake stroke. One embodiment includes rendering an image of the paper form and the third pen stroke.

Claims

1. A method for correcting digital pen strokes, the method comprising:

using a computer to perform the follow steps;

accessing a stroke collection file comprising data corresponding to a plurality of pen strokes written on a paper form using a digital pen;

determining a first set of coordinates in the stroke collection file corresponding to a removal stroke, the removal stroke written on the paper form so as to identify a corresponding mistake stroke written on the paper form;

determining a second set of coordinates in the stroke collection file corresponding to the mistake stroke;

determining a third set of coordinates in the stroke collection file that corresponds to a correction stroke written on the paper form using the digital pen so as to intersect with the removal stroke; and

removing the first set of coordinates and the second set of coordinates from the stroke collection file.

2. The method of claim 1, further comprising rendering an image of the paper form and the data in the stroke collection file after removing the first set of coordinates and the second set of coordinates from the stroke collection file, the image comprising:

first indicia corresponding to a field printed on the paper form; and

second indicia corresponding to the correction stroke as located in relation to the field printed on the paper form.

3. The method of claim 1, wherein the removal stroke comprises a zigzag pattern written through the mistake stroke on the paper form.

4. The method of claim 3, wherein the removal stroke comprises at least one substantially horizontal stroke that extends more to the left and more to the right of the mistake stroke.

5. The method of claim 3, wherein the removal stroke is written on the paper form using the digital pen after the mistake stroke is written on the paper form using the digital pen.

6. The method of claim 1, wherein removing the second set of coordinates from the stroke collection file comprises:

determining a right-most x-coordinate of the second set of coordinates;

determining a left-most x-coordinate of the second set of coordinates;

determining a bottom-most y-coordinate of the second set of coordinates;

determining a top-most y-coordinate of the second set of coordinates; and

removing each stroke coordinate from the stroke collection file that is within the right-most x-coordinate, the left-most x-coordinate, the bottom-most y-coordinate and the top-most y-coordinate of the second set of coordinates.

7. A system for modifying digital pen strokes, the system comprising:

a digital pen configured to write pen strokes on a paper form and to store corresponding stroke coordinates in a stroke collection file; and

a processor configured to;

determine a first set of coordinates in the stroke collection file corresponding to a first pen stroke, the first pen stroke written on the paper form so as to identify a corresponding second pen stroke written on the paper form, the second pen stroke being written before the first pen stroke;

determine a second set of coordinates in the stroke collection file corresponding to the second pen stroke;

determining a third set of coordinates in the stroke collection file corresponding to a third pen stroke written on the paper form using the digital pen so as to intersect with the first stroke; and

remove the first set of coordinates and the second set of coordinates from the stroke collection file.

8. The system of claim 7, further comprising a wireless communication device configured to receive the stroke collection file from the digital pen and to provide the stroke collection file to the processor.

9. The system of claim 7, wherein the processor comprises a web-based server.

10. The system of claim 9, wherein the processor is further configured to render an image of the paper form and the data in the stroke collection file after removing the first set of coordinates and the second set of coordinates from the stroke collection file, the image comprising:

first indicia corresponding to a field printed on the paper form; and

second indicia corresponding to the third stroke as located in relation to the field printed on the paper form.

11. The system of claim 7, wherein the first stroke comprises a zigzag pattern written through the second stroke on the paper form.

12. The system of claim 11, wherein the first stroke comprises at least one substantially horizontal stroke that extends more to the left and more to the right of the second stroke.

13. The system of claim 7, wherein removing the second set of coordinates from the stroke collection file comprises:

determining a right-most x-coordinate of the second set of coordinates;

determining a left-most x-coordinate of the second set of coordinates;

determining a bottom-most y-coordinate of the second set of coordinates;

determining a top-most y-coordinate of the second set of coordinates; and

removing each stroke coordinate from the stroke collection file that is within the right-most x-coordinate, the left-most x-coordinate, the bottom-most y-coordinate and the top-most y-coordinate of the second set of coordinates.

14. A computer-readable medium comprising computer executable instructions for performing a method for correcting digital pen strokes, the method comprising:

accessing a stroke collection file comprising data corresponding to a plurality of pen strokes written on a paper form using a digital pen;

determining a first set of coordinates in the stroke collection file corresponding to a removal stroke, the removal stroke written on the paper form so as to identify a corresponding mistake stroke written on the paper form;

18termining a second set of coordinates in the stroke collection file corresponding to the mistake stroke;

determining a third set of coordinates in the stroke collection file corresponding to a correction stroke written on the paper form using the digital pen so as to intersect with the removal stroke; and

removing the first set of coordinates and the second set of coordinates from the stroke collection file.

15. The computer-readable medium of claim 14, wherein the method further comprises rendering an image of the paper form and the data in the stroke collection file after removing the first set of coordinates and the second set of coordinates from the stroke collection file, the image comprising:

first indicia corresponding to a field printed on the paper form; and

second indicia corresponding to the correction stroke as located in relation to the field printed on the paper form.

16. The computer-readable medium of claim 14, wherein the removal stroke comprises a zigzag pattern written through the mistake stroke on the paper form.

17. The computer-readable medium of claim 16, wherein the removal stroke comprises at least one substantially horizontal stroke that extends more to the left and more to the right of the mistake stroke.

18. The computer-readable medium of claim 16, wherein the removal stroke is written on the paper form using the digital pen after the mistake stroke is written on the paper form using the digital pen.

19. The computer-readable medium of claim 14, wherein removing the second set of coordinates from the stroke collection file comprises:

determining a right-most x-coordinate of the second set of coordinates;

determining a left-most x-coordinate of the second set of coordinates;

determining a bottom-most y-coordinate of the second set of coordinates;

determining a top-most y-coordinate of the second set of coordinates; and

removing each stroke coordinate from the stroke collection file that is within the right-most x-coordinate, the left-most x-coordinate, the bottom-most y-coordinate and the top-most y-coordinate of the second set of coordinates.