Wacom Co., Ltd.

Stefan Yotov

Branimir Angelov

Plamen Petkov

Heidi Wang

Boriana Mladenova

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.

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

A method implemented by a computer to output digital ink includes: repeatedly generating a stroke object each time a pointer is removed from a panel, where the stroke object includes control points used to reproduce a stroke made by the pointer on the panel, the stroke starting when the pointer contacts the panel and ending when the pointer is removed from the panel; each time the stroke object is generated, determining a generation time of the stroke object and generating metadata including the generation time of the stroke object; and serializing one piece of ink data, in which the stroke object is associated with the corresponding metadata, into a binary sequence, and outputting the binary sequence.

A method implemented in a device including a position input sensor is provided, for generating ink data including stroke objects that are vector data configured to reproduce paths formed by operating a pointer. The method includes generally three step. The first step receives pen event data representative of a user's hand-drawn motion on a sensor surface. The second step generates a stroke object based on the pen event data, generates a metadata object that describes the stroke object based on the pen event data and context information received from an application supporting the pen event data, and generates a drawing style object that defines how to draw the stroke object based on the pen event data and the context information. The third step outputs the stroke object, the metadata object, and the drawing style object in association with each other in a recording format or in a transmission format.

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.

A method is provided for generating ink data including stroke objects. The method includes generally four steps. The first step receives device-dependent user-input data including either one of pen event data of Type 1, which includes indicator position data and indicator pressure data, or pen event data of Type 2, which includes indicator position data but does not include indicator pressure data. The second step determines whether the pen event data is Type 1 or Type 2. The third step derives one or both of radius data for defining a width of the stroke object and transparency data for defining a transparency of the stroke object, based on the pen event data of Type 1 or Type 2. The fourth step outputs the stroke object including said one or both of radius data and transparency data as device-independent common attribute value(s) of each of multiple points of the stroke object.

Growing community of inventors

Sofia, Bulgaria

Stefan Yotov