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

• US 10,331,338 B2
• Filed: 09/17/2018
• Issued: 06/25/2019
• Est. Priority Date: 11/19/2013
• Status: Active Grant

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Wacom Co Limited (Wacom)
• Inventors: Petkov, Plamen, Angelov, Branimir, Yotov, Stefan, Wang, Heidi, Mladenova, Boriana
• Primary Examiner(s): McDowell, Jr., Maurice L.
• Application Number:
  US16/133,300
• Publication Number:
  US 20190050143A1
• Time in Patent Office: 281 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

A method is provided for outputting ink data. The method, based on position data detected in accordance with a movement of an indicator, generates control point data capable of indicating a path of the movement using a defined curve interpolation algorithm. The method determines whether the position data is associated with pressure data. When the position data is associated with pressure data, the method derives transparency data of a curve generated from the control point data based on the pressure data. When the position data is not associated with pressure data, the method derives transparency data of a curve generated from the control point data based on an amount of change in the position data. The method outputs point data in which the control point data is associated with the transparency data.

Claims

1. A method of outputting ink data, comprising:

based on position data detected in accordance with a movement of an indicator, generating control point data capable of indicating a path of the movement using a defined curve interpolation algorithm;

determining whether the position data is associated with pressure data;

when the position data is associated with pressure data, deriving transparency data of a curve generated from the control point data based on the pressure data;

when the position data is not associated with pressure data, deriving transparency data of a curve generated from the control point data based on an amount of change in the position data; and

outputting point data in which the control point data is associated with the transparency data.

2. The method of claim 1, wherein the outputting includes outputting a position coordinate, which is indicated by the control point data, and the transparency data, wherein the position coordinate and the transparency data are included in one unit of the point data.

3. The method of claim 2, wherein the outputting includes outputting multiple units of the point data included in one unit of stroke data.

4. The method of claim 3, wherein the outputted stroke data has a transparency that is variable according to the transparency data.

5. The method of claim 3, wherein

when the position data is not associated with pressure data the deriving includes a function step, and

the function step includes deriving, based on the position data and time information regarding the position data, parameters corresponding to respective speeds of the multiple units of the point data that constitute the one stroke data, and using a function to determine the width data, wherein the function defines a relationship in which, when the parameter corresponding to the speed increases, a value of the transparency data increases or decreases.

6. The method of claim 5, wherein the function step includes selecting the function out of multiple functions having different characteristics based on a type of the indicator.

7. The method of claim 1, wherein when the position data is not associated with pressure data the deriving includes deriving the transparency data based on the amount of change in the position data and time information regarding the position data.

8. The method of claim 1, wherein when the position data is associated with pressure data the deriving includes deriving the transparency data based on an amount of change in the position data and the pressure data.

9. The method of claim 1, wherein the defined curve interpolation algorithm is a Catmull-Rom curve interpolation algorithm.

10. The method of claim 1, wherein the control point data is represented in a two-dimensional coordinate system or in a three-dimensional coordinate system.

11. An ink data outputting device, configured to perform a process including:

based on position data detected in accordance with a movement of an indicator, generating control point data capable of indicating a path of the movement using a defined curve interpolation algorithm;

determining whether the position data is associated with pressure data;

when the position data is associated with pressure data, deriving transparency data of a curve generated from the control point data based on the pressure data;

when the position data is not associated with pressure data, deriving transparency data of a curve generated from the control point data based on an amount of change in the position data; and

outputting point data in which the control point data is associated with the transparency data.