KR20030054230A - A formatting method for digital ink data and data communication method using digital ink data - Google Patents

Abstract

PURPOSE: An electronic ink data forming method and a data communication method using the ink data forming method are provided to enable data communication irrespective of communication methods and display screen sizes and reduce the quantity of data transmitted. CONSTITUTION: Information inputted from a display screen of an electronic device, page constructing information(32) including information about the size of the display screen, background color of a page and the number of strokes inputted in the page, and stroke forming information(34) about at least one stroke inputted in the page are formed into data in unit of page. The stoke forming information includes flag information indicating connectivity of neighboring strokes among the strokes, and coordinate values of at least two points constructing each stroke other than unnecessary points.

Description

Electronic ink data formation method and data communication method using same {A FORMATTING METHOD FOR DIGITAL INK DATA AND DATA COMMUNICATION METHOD USING DIGITAL INK DATA}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electronic ink data, and more particularly, to reduce the amount of data of electronic ink data formed in an electronic device, thereby saving memory space for storing the electronic ink data, and transmitting the data regardless of the display screen size of the electronic device transmitting and receiving. An electronic ink data forming method for efficiently displaying electronic ink data and a data communication method using the same.

In general, digital ink data has advantages of being much more reeditable and smaller in size than, for example, bitmap and vector-based graphic data. It is a popular trend.

However, such an electronic ink has a drawback that a lot of restrictions are placed on the written environment. For example, the conventional communication of the electronic ink data outputs the transmitted electronic ink data when the display screen of the electronic device that forms the electronic ink data is different from the display screen of the electronic device that outputs the electronic ink data. There was a problem that could not be displayed.

Accordingly, the conventional electronic ink expression method has no choice but to perform mutual data communication assuming that the creation environment and the display environment are the same.

In addition, the method of expressing the electronic ink data without considering the size of the data has a problem in that it is difficult to transmit due to a large amount of transmission during data communication, and in particular, a large storage capacity of the electronic ink data requires a large amount of storage space. there was.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to implement an electronic ink data forming method capable of data communication regardless of various communication methods and display screen sizes and a communication method using the same.

In addition, an object of the present invention is to implement a method for forming an electronic ink data and a communication method using the same to minimize the amount of data required to store a minimum storage space for storage and to transmit efficiently.

Therefore, the present invention more efficiently expresses electronic ink data in all electronic devices that perform data communication using electronic ink data, so that the electronic ink data can be correctly represented regardless of the display screen size of the transmitting electronic device and the display screen size of the receiving electronic device. It is to be able to transmit and receive the display.

1 is a diagram showing a display screen for explaining a working environment for forming electronic ink data according to the present invention;

FIG. 2 shows coordinates for the particular stroke shown in FIG. 1; FIG.

3A to 3D illustrate a process of removing unnecessary points of a specific stroke shown in FIG. 2;

4 is a diagram showing a data configuration of electronic ink data according to the present invention;

5 is a flowchart illustrating a method of forming and transmitting electronic ink data according to the present invention; And

6 is a flowchart illustrating a method of receiving electronic ink data according to the present invention.

Explanation of symbols on the main parts of the drawings

2: page 10: absolute coordinate origin

12, 14: stroke 20: relative coordinate origin

30: electronic ink data 32: page configuration information

34: Stroke Configuration Information

An electronic ink data forming method according to an aspect of the present invention for achieving the above object is a method for forming information input from a display screen of an electronic device into electronic ink data: a page including size information of the display screen Forming the input information as data in page units, including configuration information and stroke configuration information of at least one stroke input to the page; The stroke configuration information may include flag information indicating linkage between adjacent strokes among the strokes, remove unnecessary points among points constituting the strokes, and include coordinate values of at least two remaining points. .

In addition, the data communication method using the electronic ink data according to an aspect of the present invention for achieving the above object is the electronic ink data between a plurality of electronic devices for forming the information input through the display screen as the electronic ink data; A communication method for performing data communication with each other, the method comprising: page configuration information including size information of the display screen from one of the electronic devices and stroke configuration information of at least one stroke input to the page Forming the input information as a page unit data, including; Encoding the formed electronic ink data; Transmitting the encoded data to another electronic device through an external communication network;

The stroke configuration information may include flag information indicating linkage between adjacent strokes among the strokes, remove unnecessary points among points constituting the strokes, and include coordinate values of at least two remaining points. .

In the present invention, the other electronic device may further comprise: receiving the transmitted encoded data and decoding the encoded data into the electronic ink data; Determining the display screen size of the one electronic device from the decoded electronic ink data; Calculating a display ratio by using a ratio of the display screen size of the one electronic device to the size of the display screen of the other electronic device; Restoring the coordinate values based on an origin of the display screen of the other electronic device; And outputting the coordinate values to the display screen of the other electronic device by using the display ratio.

Therefore, according to the present invention, when electronic ink data is transmitted or stored in a file using various communication methods such as various electronic devices, communication protocols, etc., the intent created on the display screen is opened by opening or receiving the file regardless of the created creation environment. Correspondingly, efficient electronic ink data is formed for accurate display.

DETAILED DESCRIPTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing a display screen for explaining a creation environment for forming electronic ink data according to the present invention.

Referring to the drawings, although not shown in the drawing, the display screen is a display screen of a portable electronic device such as a personal data processing device (PDA), and is configured to directly input information through a stylus pen or the like on the display screen. desirable.

Here, the input information is formed of electronic ink data, and the electronic ink data is formed in the size of a page 2 unit.

The page 2 also consists of a plurality of strokes 12, 14 and at least two points forming each of the plurality of strokes 12, 14.

Therefore, the electronic ink data formed by the electronic ink data forming method according to the present invention is composed of the page configuration information for the page and the stroke configuration information for the stroke represented by the minimum unit.

4 is a diagram showing a data format structure of electronic ink data according to the present invention.

Referring to the drawings, the electronic ink data 30 includes page configuration information 32 and stroke configuration information 34.

Here, the page configuration information 32 is configured to include size information of the display screen which is a creation screen of electronic ink data, that is, a width and a height of the display screen. In addition, the page configuration information 32 may include background color and stroke number information of the display screen.

On the other hand, the stroke configuration information 34 is flag information for storing the succession to the configuration information of the previous stroke, the stroke thickness, color, the type of the electronic ink (for example, the general ink input by handwriting, pre-set Graphics, etc.), types of lines (e.g., solid lines, dashed lines and dashed lines), and information indicating the characteristics of the stroke, such as the number of points.

The flag information is used as it is by displaying information on a property that is repeated in a subsequent stroke among the properties of a previous stroke as a flag bit.

That is, as described above, each stroke is represented by thickness, color, type of electronic ink, type of line, and number of points, where for the color, line type, thickness, etc. having a small variable characteristic with respect to the stroke, the following stroke is the previous stroke. It is not necessary to provide information indicating the characteristics of the stroke by expressing the flag bit having continuity with respect to.

The stroke configuration information 34 includes coordinate value information of each point constituting the stroke.

The coordinate values of the points include X and Y axis coordinate values expressed in absolute or relative coordinates with respect to the origin 10 of the creation screen.

This indicates that the points of the general stroke represented are represented by coordinate values which are absolute coordinates indicated by the origin 10. In this case, when the configuration information of the stroke is displayed using the absolute coordinates, a large storage capacity is solved. In order to display a coordinate value by using each origin, for example, a specific stroke 14, a large amount of storage space is required to display the coordinate values. A variable that stores is expressed as a relative coordinate with respect to this origin (20).

This is a way to minimize the storage space needed to represent stroke coordinate values. That is, since 1 byte is 8 bits (28 = 256), the point coordinate value of the stroke within 255 pixels from the origin 10 in the creation screen can be expressed as 1 byte, but the area where the coordinate is large in the creation screen, for example, the creation screen If the coordinates of the points constituting the specific stroke represented by are positions of 255 pixels or more, when the absolute coordinates are used, the coordinates of all the points included in the creation screen should always be expressed by 2 bytes or more. However, the points that make up a specific stroke using relative coordinates in stroke units can be expressed as 1 byte of storage space.

Therefore, the coordinate values of the respective points are represented using absolute coordinates represented by the origin of the display screen (composing screen), and when the specific stroke among the coordinate values is a stroke input within a specific area of the display screen, the It is represented by the coordinate value of each point of a specific stroke by the relative coordinate which originates one point with respect to a specific stroke.

This will be described in more detail with reference to FIGS. 1 and 2 as follows.

Referring to FIG. 1, coordinate values of respective points constituting each stroke in the page are basically expressed as absolute coordinates based on the origin 10 of the page.

For example, when the area A of the page consists of 127 cells in width and height, the stroke represented by the area A, that is, the point coordinates constituting the stroke “o” 12 can be represented by 1 byte. In this case, even though the coordinate values of the respective points are expressed in the absolute coordinates based on the origin 10 of the page, they are represented within 1 byte so that they do not occupy much data capacity.

However, when the coordinate values of the points are displayed using only absolute coordinates, a large amount of data is occupied in a specific area.

FIG. 2 is a diagram for implementing coordinate values according to relative coordinates of a specific stroke shown in FIG. 1.

Referring to the drawings, the specific stroke 14 has an origin 20 of relative coordinates for comparison with the origin 10 of absolute coordinates shown in FIG. In addition, the specific stroke 14 is represented by the coordinate values according to the configuration information of the stroke using the origin 20 of the relative coordinates.

That is, in FIG. 1, the specific stroke "a" 14 represented in the region B of the page is far from the origin 10 of the page, so that each point constituting the specific stroke 14 is divided into the origin 10 of the page. It takes more than 1 byte to display coordinate value using).

Therefore, in this case, as shown in FIG. 2, one point of the specific stroke 14 is used as the origin 20, and each point of the specific stroke 14 is represented by a relative coordinate value, thereby minimizing the amount of data required. .

On the other hand, when a coordinate value is expressed using relative coordinates (for example, when a stroke is created over the entire display screen as a creation screen), when more storage space is required than when expressed using absolute coordinates, Naturally, using coordinates is unnecessary.

In addition, the points constituting each stroke may be unnecessary in some cases in the electronic ink data forming method for representing the stroke after the dot in some cases. In this case, for example, in the case of a straight line, only coordinate information of two points on the same straight line is needed. And when the degree of deviation from the straight line is within the threshold value, the information on these points can be removed, so that the stroke can be expressed by minimizing the information of the points constituting the stroke.

3A to 3D are views illustrating a process of removing unnecessary points of a specific stroke shown in FIG. 2.

Referring to FIG. 3A, it can be seen that the specific stroke 14 is represented by a plurality of points as described above. As shown in FIG. 3B, only points a, b, c, and d remain after the process of removing points within an unnecessary threshold among the plurality of points. Then, the remaining points a, b, c, and d as shown in Fig. 3c remove unnecessary points from the specific stroke 14 and are represented as a simplified stroke 14 '.

In this case, unnecessary points within the threshold may be determined using a threshold set according to a slope of a straight line connecting two points among the points constituting the strokes.

This will be described in detail with reference to FIG. 3D.

As shown in point a 'in Fig. 3d, the slope of the straight line k between the points a and b is compared with the slope of the points a' between the points a and b, and the straight line k 'is the difference between the slopes. If less than is determined within the set threshold, it is possible to remove each point between the points a and b by removing the point a 'between the points a and b.

And, in the point b of FIG. 3D, when the slope of the straight line p connecting the point b and the point c and the slope of the straight line p 'connecting the point b and the point d is compared, the point is determined to be larger than the set threshold. d cannot be removed, and each point between the points d and c determined within the set threshold can be removed.

In addition, when a vertical distance from a point to a straight line connecting two points is determined as a distance within a predetermined threshold, unnecessary points may be removed by removing the point.

As a result, each stroke existing in the page can be represented with a minimum amount of data, thereby saving memory space required for storage, and in particular, minimizing the amount of data transmitted when transmitting by communication.

5 and 6 are flowcharts illustrating procedures for forming, transmitting and receiving electronic ink data for general purpose wired and wireless data communication between a plurality of electronic devices according to the present invention. This procedure is implemented in all electronic devices capable of wired or wireless communication and is a program processed by a controller (not shown) of the corresponding device.

Referring to FIG. 5, in step S40, page configuration information including size information of the display screen (composing screen) from one of the electronic devices and stroke configuration information on at least one stroke input to the page. Including the information, the input information is formed as data in units of pages.

Here, the stroke configuration information may include flag information indicating the linkage between adjacent strokes among the strokes and unnecessary points corresponding to the case where the difference between the slopes of the straight lines connecting the points constituting the strokes is within a set threshold. , Coordinate values for at least two remaining points.

In addition, the coordinate values are represented using absolute coordinates indicated by the origin of the display screen, and when a specific stroke among the coordinate values is a stroke input within a specific area of the display screen, one point of the specific stroke is originated. It is preferable to represent by the coordinate value of each point of a specific stroke by the relative coordinate to become.

Thereafter, in step S48, encoding is performed using character string data. That is, when the expression of the page which is the highest unit of the electronic ink data is completed, it is encoded by using a string encoding technique used in a mail transmission program, for example, a base 64 application. In this way, the electronic ink data has character string characteristics and can be stored in the same manner as a database for storing character strings. In addition, transmission and reception are possible regardless of various communication protocols.

Subsequently, in step S50, the device transmits to another electronic device through an external communication network.

6, a process of receiving and processing electronic ink data transmitted from one electronic device by another electronic device will be described below.

First, in step S60, the other electronic device receives the transmitted encoded data, and in step S62, decodes the electronic ink data.

Thereafter, in step S64, the size of the display screen (creation screen) of the one electronic device that has transmitted the electronic ink data is determined from the page configuration information of the decoded electronic ink data.

As a result of the determination, in step S66, the display ratio is calculated using the ratio of the created screen size to the size of the display screen (display screen) of the other electronic device.

For example, the display ratio is calculated as shown in Equation 1 below by using the size information of the display screen, which is the screen on which the electronic ink data is created and the currently output screen.

(Equation 1)

rate_w = w2 / w1rate_h = h2 / h1if (rate_w <rate_h)

rate = rate_welserate = rate_h

Where w1 and w2 are the width of the creation screen and the display screen, h1 and h2 are the height, and rate_w, rate_h, and rate are the width ratio, height ratio, and display ratio. When the electronic ink data is transferred from the creation screen to the display screen, the width ratio, the height ratio, and the display ratio of the creation screen and the display screen are calculated using (Formula 1).

Thereafter, in step S68, coordinate values of each point constituting the stroke are restored based on the origin of the display screen. Here, there are two ways to restore. The first method is to maintain the relative ratio of the width and height of the creation screen to the display screen, thereby preventing the image from being distorted from being formed by the ink data on the display screen.

It restores the coordinate value by using the following equation (2) or (3).

(Equation 2)

x = x1 * rate + x0y = y1 * rate + y0

(Equation 3)

x = (x1 + xmin) * rate + x0

y = (y1 + ymin) * rate + y0

Here, (Formula 2) is a coordinate value calculated when displaying the coordinates of the points using the origin of the absolute coordinates, (Formula 3) is a coordinate when displaying the coordinates of the points using the origin of the relative coordinates The value is calculated.

And x and y represent coordinate values to be displayed, x0 and y0 represent the origin of absolute coordinates, and xmin and ymin represent the origin of relative coordinates. And x1, y1 refers to the coordinate value of a specific point stored in the configuration information of the stroke, rate refers to the display ratio.

Therefore, in the case of using absolute coordinates, even when two or more bytes of storage space for storing coordinate values are required, the relative coordinates can be represented by one byte.

The second method is to disregard the relative ratio of the width and height of the creation screen on the display screen, and to express the image formed by the ink data in accordance with the width and height on the display screen so that the image is distorted, but it appears to fit the display screen. This is used to restore the coordinates using (Equation 4) or (Equation 5) below.

(Equation 4)

x = x1 * rate_w + x0

y = y1 * rate_h + y0

(Eq. 5)

x = (x1 + xmin) * rate_w + x0

y = (y1 + ymin) * rate_h + y0

Here, (Equation 4) is a coordinate value calculated when displaying the coordinates of the points using the origin of the absolute coordinates, (Equation 5) is a coordinate when displaying the coordinates of the points using the origin of the relative coordinates The value is calculated, and in the case of using absolute coordinates as in the first method described above, even when two or more bytes of storage space for storing coordinate values are required, the relative coordinates can be represented by one byte.

Subsequently, reception of the electronic ink data is completed by outputting the coordinate values to the display screen of the other electronic device using the display ratio in step S70.

Therefore, the electronic ink data according to the present invention accurately displays the received electronic ink data even when configured in a display environment of various sizes on the receiving side or the file opening side.

As described above, the present invention expresses electronic ink data by using the present invention to transmit and receive electronic ink data or to store a file, so that even when the environment in which the electronic ink data is created and the display environment are different from each other, the prototype is almost complete. It can be output as it is and saves memory space required for transmission and reception.

Claims (10)

A method for forming information input from a display screen of an electronic device into electronic ink data, the method comprising: Page information including page configuration information including size information of the display screen, background color of a page, the number of strokes entered in the page, and stroke configuration information for at least one stroke input to the page. Formed of data in units; The stroke configuration information may include flag information indicating association between adjacent strokes among the strokes, remove unnecessary points among points constituting the strokes, and include coordinate values of at least two remaining points. Electronic ink data formation method. The method of claim 1, The coordinate values are represented using absolute coordinates represented by the origin of the display screen. In the case where a specific stroke among the coordinate values is a stroke input within a specific area of the display screen, the electronic ink represented by the coordinate value of each point of the specific stroke by relative coordinates having one point of the specific stroke as an origin. How data is formed. The method of claim 1, The coordinate values are electronic ink data forming method of removing unnecessary points corresponding to the case where the difference in the slope of the straight lines connecting the points constituting the respective strokes is within the set threshold. The method of claim 1, And the page configuration information further includes size information of the screen, a background color of a page, and the number of strokes input in the page. The method of claim 1, And forming the electronic ink data, and then encoding and storing the electronic ink data. A communication method for performing mutual data communication using the electronic ink data between a plurality of electronic devices forming information input through a display screen as electronic ink data. The page information includes page configuration information including size information of the display screen from one of the electronic devices and stroke configuration information on at least one stroke input to the page. Forming a; Encoding the formed electronic ink data; Transmitting the encoded data to another electronic device through an external communication network; The stroke configuration information may include flag information indicating connectivity between adjacent strokes among the strokes, remove unnecessary points within a threshold value among points constituting the strokes, and include coordinate values for at least two remaining points. A data communication method using electronic ink data, characterized by the above-mentioned. The method of claim 6, The coordinate values are represented using absolute coordinates represented by the origin of the display screen. In the case where a specific stroke among the coordinate values is a stroke input within a specific area of the display screen, the electronic ink represented by the coordinate value of each point of the specific stroke by relative coordinates having one point of the specific stroke as an origin. Data communication method using data. The method according to claim 6 or 7, Receiving, by the other electronic device, the transmitted encoded data into the electronic ink data; Determining the display screen size of the one electronic device from the decoded electronic ink data; Calculating a display ratio by using a ratio of the display screen size of the one electronic device to the size of the display screen of the other electronic device; Restoring the coordinate values based on an origin of the display screen of the other electronic device; Outputting the coordinate values to the display screen of the other electronic device using the display ratio. The method of claim 8, The step of calculating the display ratio, rate_w = w2 / w1 rate_h = h2 / h1 if (rate_w <rate_h) rate = rate_w else rate = rate_h (w1, w2 is the width of the creation screen and display screen, h1, h2 is the height of the creation screen and display screen, rate_w, rate_h, rate is width ratio, height ratio, display ratio) Restoring the coordinate values, If the coordinates of the points are represented using the origin of absolute coordinates x = x1 * rate + x0 y = y1 * rate + y0 (x, y is the coordinate value to be displayed, x0, y0 is the origin of absolute coordinates, x1, y1 is the coordinate value of a specific point stored in the configuration information of the stroke, rate is the display ratio), If the coordinates of the points are displayed using the origin of the relative coordinates x = (x1 + xmin) * rate + x0 y = (y1 + ymin) * rate + y0 (x, y is the coordinate value to be displayed, x0, y0 is the origin of the absolute coordinate, xmin, ymin is the origin of the relative coordinate, x1, y1 is the coordinate value of the specific point stored in the stroke configuration information, rate is the display ratio) A data communication method using electronic ink data, wherein the data is restored using the electronic ink data. The method of claim 8, The step of calculating the display ratio, rate_w = w2 / w1 rate_h = h2 / h1 (rate_w, rate_h is the width ratio, height ratio) Restoring the coordinate values, If the coordinates of the points are represented using the origin of absolute coordinates x = x1 * rate_w + x0 y = y1 * rate_h + y0 (x, y is the coordinate value to be displayed, x0, y0 is the origin of absolute coordinates, x1, y1 is the coordinate value of a specific point stored in the configuration information of the stroke) If the coordinates of the points are displayed using the origin of the relative coordinates x = (x1 + xmin) * rate_w + x0 y = (y1 + ymin) * rate_h + y0 (x, y is the coordinate value to be displayed, x0, y0 is the origin of the absolute coordinate, xmin, ymin is the origin of the relative coordinate, x1, y1 is the coordinate value of a specific point stored in the stroke configuration information) A data communication method using electronic ink data, characterized in that.