Method and system for ink data generation, ink data rendering, ink data manipulation and ink data communication

• US 10,409,484 B2
• Filed: 01/28/2019
• Issued: 09/10/2019
• Est. Priority Date: 11/19/2013
• Status: Active Grant

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Wacom Co Limited (Wacom)
• Inventors: Angelov, Branimir, Petkov, Plamen
• Primary Examiner(s): McDowell, Jr., Maurice L.
• Application Number:
  US16/259,614
• Publication Number:
  US 20190155498A1
• Time in Patent Office: 225 Days
• CPC Class Codes: G06F 2203/0383 Remote input, i.e. interface arrangements in which the signals generated by a pointing device are transmitted to a PC at a remote location, e.g. to a PC in a LAN
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/0346 with detection of the device orientation or free movement in a 3D space, e.g. 3D mice, 6-DOF [six degrees of freedom] pointers using gyroscopes, accelerometers or tilt-sensors
• CPC Class Codes: G06F 3/0354 with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/038 Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0414 using force sensing means to determine a position
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text
• CPC Class Codes: G06Q 10/101 Collaborative creation, e.g. joint development of products or services
• CPC Class Codes: G06T 11/203 Drawing of straight lines or curves
• CPC Class Codes: G06V 30/1423 the instrument generating sequences of position coordinates corresponding to handwriting preprocessing or recognising digital ink G06V30/32
• CPC Class Codes: G06V 30/347 Sampling; Contour coding; Stroke extraction

Abstract

Methods and systems are provided for generating, rendering, manipulating (e.g., slicing), and communicating stroke objects that form ink data. In a method of generating a stroke object, pen event data indicative of pen down, pen movement, and pen up events are sequentially received to generate point objects that collectively form a stroke object. The point objects serve as control points for interpolating curve segments. Further, a start parameter indicative of a start point within a starting curve segment of the curve segments at which display of the stroke object starts, and an end parameter indicative of an end point within an ending curve segment of at which display of the stroke object ends, are generated for the stroke object. When rendering the stroke object, a system limits display of the stroke object to a range bound by the start and end parameters, as opposed to displaying the entire stroke object.

Claims

1. A method of manipulating ink data, executed by a computer used with a position detection sensor which detects a position indicated by a pointer, the method comprising:

storing ink data in a memory device, the ink data including one or more stroke data which respectively include control points for generating a pre-existing path formed of curve segments according to a defined curve interpolation algorithm, and which respectively include a start parameter indicative of a start point within a starting curve segment of the curve segments at which display of the pre-existing path starts and an end parameter indicative of an end point within an ending curve segment of the curve segments at which display of the pre-existing path ends;

after storing the ink data in the memory device, determining whether a manipulation path formed of a group of coordinates data obtained by the position detection sensor intersects the one or more pre-existing paths of the one or more stroke data, respectively; and

with respect to a first stroke data, which is the stroke data determined to include the pre-existing path that is intersected by the manipulation path;

deriving anew at least one of the start parameter and the end parameter based on the coordinates data of an intersection between the pre-existing path of the first stroke data and the manipulation path, and

without deriving the control points anew, generating a second stroke data, which includes at least one of the start parameter and the end parameter that are generated anew and a portion of the control points.

2. The method of claim 1, wherein

the coordinates data of the intersection between the pre-existing path of the first stroke data and the manipulation path is derived based on a width data defined for the manipulation path.

3. The method of claim 1, comprising:

determining whether the manipulation path entails a slicing operation to slice the first stroke data, and

generating the second stroke data in response to the manipulation path being determined to entail the slicing operation.

4. The method of claim 3, comprising:

in response to the manipulation path being determined to be an erasing operation to erase the first stroke data, determining the manipulation path entails the slicing operation to slice the first stroke data.

5. The method of claim 1, comprising:

display-rendering the second stroke data.

6. The method of claim 1, comprising:

determining whether the ink data is shared by a remote computer; and

in response to the ink data being determined to be shared by the remote computer, transmitting to the remote computer a message including information related to the manipulation path entailing a slicing operation applied to the first stroke data.

7. The method of claim 6, wherein

the information related to the manipulation path entailing the slicing operation includes one or more of:

a slice object indicative of the manipulation path, the group of coordinates data forming the manipulation path, or the second stroke data.

8. A computer configured to be used with a position detection sensor which detects a position indicated by a pointer, the computer being loaded with computer-executable instructions to execute steps comprising:

storing ink data in a memory device, the ink data including one or more stroke data which respectively include control points for generating a pre-existing path formed of curve segments according to a defined curve interpolation algorithm, and which respectively include a start parameter indicative of a start point within a starting curve segment of the curve segments at which display of the pre-existing path starts and an end parameter indicative of an end point within an ending curve segment of the curve segments at which display of the pre-existing path ends;

after storing the ink data in the memory device, determining whether a manipulation path formed of a group of coordinates data obtained by the position detection sensor intersects the one or more pre-existing paths of the one or more stroke data, respectively; and

with respect to a first stroke data, which is the stroke data determined to include the pre-existing path that is intersected by the manipulation path;

deriving anew at least one of the start parameter and the end parameter based on the coordinates data of an intersection between the pre-existing path of the first stroke data and the manipulation path, and

without deriving the control points anew, generating a second stroke data, which includes at least one of the start parameter and the end parameter that are generated anew and a portion of the control points.